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Versions: 00 01 02 03 04 05 06 07 08 draft-ietf-rtcweb-sdp

Network Working Group                                      S. Nandakumar
Internet-Draft                                               C. Jennings
Intended status:  Informational                                    Cisco
Expires:  April 23, 2014                                October 20, 2013


                           SDP for the WebRTC
                     draft-nandakumar-rtcweb-sdp-03

Abstract

   The Web Real-Time Communication (WebRTC) [WEBRTC] working group is
   charged to provide protocol support for direct interactive rich
   communication using audio, video and data between two peers' web
   browsers.  With in the WebRTC framework, Session Description protocol
   (SDP) [RFC4566] is used for negotiating session capabilities between
   the peers.  Such a negotiation happens based on the SDP Offer/Answer
   exchange mechanism described in the RFC 3264 [RFC3264].

   This documents provides an informational reference in describing the
   role of SDP and Offer/Answer exchange for the most common WebRTC use-
   cases.

   This SDP examples provided in this document is still a work in
   progress, but it aims to align closest to the evolving standards
   work.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 23, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.



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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.










































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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  SDP and the WebRTC  . . . . . . . . . . . . . . . . . . . . .   4
   4.  Offer/Answer and the WebRTC . . . . . . . . . . . . . . . . .   5
   5.  WebRTC Session Description Examples . . . . . . . . . . . . .   6
     5.1.  Syntax Conventions  . . . . . . . . . . . . . . . . . . .   6
     5.2.  Basic Examples  . . . . . . . . . . . . . . . . . . . . .   7
       5.2.1.  Two-Way Audio Only Session  . . . . . . . . . . . . .   7
       5.2.2.  Two-Way Audio/Video Session . . . . . . . . . . . . .  11
       5.2.3.  Secure Two-Way Data Only Session  . . . . . . . . . .  17
       5.2.4.  Audio Call On Hold  . . . . . . . . . . . . . . . . .  19
       5.2.5.  Audio with DTMF Session . . . . . . . . . . . . . . .  22
       5.2.6.  One Way Audio/Video Session - Document Camera . . . .  27
     5.3.  Stream Mutiplexing Examples . . . . . . . . . . . . . . .  31
       5.3.1.  Audio, Video Session with BUNDLE Support Unknown  . .  31
       5.3.2.  Audio, Video w/BUNDLE Support Known . . . . . . . . .  38
       5.3.3.  Audio, Video and Data BUNDLE  . . . . . . . . . . . .  43
       5.3.4.  Secure Two-Way Audio,Video w/BUNDLE Unsupported . . .  48
     5.4.  MultiResolution, RTX, FEC Examples  . . . . . . . . . . .  53
       5.4.1.  Sendonly Simulcast w/2 cameras and 2 encodings per
               camera  . . . . . . . . . . . . . . . . . . . . . . .  53
       5.4.2.  Successful SVC Video Stream . . . . . . . . . . . . .  60
       5.4.3.  Successful Simulcast Video Streams with
               Retransmisson . . . . . . . . . . . . . . . . . . . .  64
       5.4.4.  Successful 1-way Simulcast with 2 resolutions and
               RTX - One resolution rejected . . . . . . . . . . . .  68
       5.4.5.  Simulcast Video Stream with Forward Error
               Correction  . . . . . . . . . . . . . . . . . . . . .  73
     5.5.  Others  . . . . . . . . . . . . . . . . . . . . . . . . .  78
       5.5.1.  Video Session with Reduced-Size RTCP Support  . . . .  78
       5.5.2.  Audio Session Voice Activity Detection  . . . . . . .  81
       5.5.3.  Audio Conference - Voice Activity Detection . . . . .  84
       5.5.4.  Successful legacy Interop Fallaback with
               bundle-only . . . . . . . . . . . . . . . . . . . . .  88
       5.5.5.  Session with Trickle ICE support  . . . . . . . . . .  92
       5.5.6.  Legacy Interop with RTP/AVP profile . . . . . . . . .  96
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . 101
   7.  Change Log  . . . . . . . . . . . . . . . . . . . . . . . . . 101
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . 101
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . 101
     8.2.  Informative References  . . . . . . . . . . . . . . . . . 102
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . 105







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1.  Introduction

   Javascript Session Exchange Protocol(JSEP) [JSEP] specifies a generic
   protocol needed to generate [RFC3264] Offers and Answers negotiated
   between the WebRTC peers for setting up, updating and tearing down a
   WebRTC session.  For this purpose, SDP is used to construct [RFC3264]
   Offers/Answers for describing (media and non-media) streams as
   appropriate for the recipients of the session description to
   participate in the session.

   The remainder of this document is organized as follows:  Section 3
   and 4 provides an overview of SDP and the Offer/Answer exchange
   mechanism.  Section 5 and 6 provide sample SDP generated for the most
   common WebRTC use-cases.


2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT",
   "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be
   interpreted as described in [RFC2119].


3.  SDP and the WebRTC

   The purpose of this section is to provide a general overview of SDP
   and its components.  For a more in-depth understanding, the readers
   are advised to refer to [RFC4566].

   The Session Description Protocol (SDP) [RFC4566] describes multimedia
   sessions, which can contain audio, video, whiteboard, fax, modem, and
   other streams.  SDP provides a general purpose, standard
   representation to describe various aspects of multimedia session such
   as media capabilities, transport addresses and related metadata in a
   transport agnostic manner, for the purposes of session announcement,
   session invitation and parameter negotiation.

   As of today SDP is widely used in the context of Session Initiation
   Protocol [RFC3261], Real-time Transport Protocol [RFC3550] and Real-
   time Streaming Protocol applications [RFC2326].

   Below figure introduces high-level breakup of SDP into components
   that semantically describe a multimedia session, in our case, a
   WebRTC session [WEBRTC].  It by no means captures everything about
   SDP and hence, should be used for informational purposes only.

   [WEBRTC] proposes JavaScript application to fully specify and control
   the signaling plane of a multimedia session as described in the JSEP



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   specification [JSEP].  JSEP provides mechanisms to create session
   characterization and media definition information to conduct the
   session based on SDP exchanges.

   In this context, SDP serves two purposes:
      Provide grammatical structure syntactically.
      Semantically convey partipant's intention and capabilities
      required to successfully negotiate a session.


4.  Offer/Answer and the WebRTC

   This section introduces SDP Offer/Answer Exchange mechanism mandated
   by WebRTC for negotiating session capabilities while setting up,
   updating and tearing down a WebRTC session.  This section is
   intentionally brief in nature and interested readers are recommended
   to refer [RFC3264] for specific details on the protocol operation.

   The Offer/Answer [RFC3264] model specifies rule for the bilateral
   exchange of Session Description Protocol (SDP) messages for creation
   of multimedia streams.  It defines protocol with involved
   participants exchanging desired session characteristics from each
   others perspective constructed as SDP to negotiate the session
   between them.

   In the most basic form,the protocol operation begins by one of the
   participants sending an initial SDP Offer describing its intent to
   start a multimedia communication session.  The participant receiving
   the offer MAY generate an SDP Answer accepting the offer or it MAY
   reject the offer.  If the session is accepted the Offer/Answer model
   guarantees a common view of the multimedia session between the
   participants.

   At any time, either participant MAY generate a new SDP offer that
   updates the session in progress.

   With in the context of WebRTC, the Offer/Answer model defines the
   state-machinery for WebRTC peers to negotiate session descriptions
   between them during the initial setup stages as well as for eventual
   session updates.  Javascript Session Establishment Protocol
   specification [JSEP] for WebRTC provides the mechanism for generating
   [RFC3264] SDP Offers and Answers in order for both sides of the
   session to agree upon details such as list of media formats to be
   sent/received, bandwidth information, crypto parameters, transport
   parameters, for example.






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5.  WebRTC Session Description Examples

   A typical web based real-time multimedia communication session can be
   characterized as below:

   o  It has zero or more Audio only, Video only or Audio/Video RTP
      Sessions,
   o  MAY contain zero or more non-media data sessions,
   o  All the sessions are secured with DTLS/SRTP,
   o  Supports NAT traversal using ICE mechanism,
   o  Provides RTCP based feedback mechanisms,
   o  Sessions can be over IPv4-only, IPv6-only, dual-stack based
      clients.

5.1.  Syntax Conventions

   The examples given in this document follow the conventions listed
   below:

   o  In all the examples, Alice and Bob are assumed to be the WebRTC
      peers.
   o  Call flow diagrams that accompany the use-cases capture only the
      prominent aspects of the system behavior and intentionally is not
      detailed to improve readability.
   o  The SDP examples deviate from actual on-the-wire SDP notation in
      several ways.  This is done to facilitate readability and to
      conform to the restrictions imposed by the RFC formatting rules.
   o  Any SDP line that is indented (compared to the initial line in the
      SDP block) is a continuation of the preceding line.  The line
      break and indent are to be interpreted as a single space
      character.
   o  Empty lines in any SDP example are inserted to make functional
      divisions in the SDP clearer, and are not actually part of the SDP
      syntax.
   o  Excepting the above two conventions, line endings are to be
      interpreted as <CR><LF> pairs (that is, an ASCII 13 followed by an
      ASCII 10).
   o  Against each SDP line, pointers to the appropriate RFCs are
      provide for further information reference.  Also an attempt has
      been made to provide explanatory notes to enable better
      understanding of the SDP usage, wherever appropriate.
   o  Following SDP details are common across all the use-cases defined
      in this document unless mentioned otherwise.
      *  DTLS fingerprint for SRTP (a=fingerprint)
      *  RTP/RTCP Multiplexing (a=rtcp-mux)
      *  RTCP Feedback support (a=rtcp-fb)





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      *  Host, server-reflexive and relayed ICE candidates (a=candidate)
      *  SRTP Setup framework parameters (a=setup)
   o  The term "Session" is used rather loosely in this document to
      refer to either a "Communication Session" or a "RTP Session" or a
      "RTP Stream" depending on the context.
   o  Payload type 109 is usually used for OPUS, 99 for H.264 and 120
      for VP8 in most of the examples to maintain uniformity.
      OPEN ISSUE:SDP Examples for Data Channel, Simulcast, SVC are still
      being discussed and thus not represent the final solution.

5.2.  Basic Examples

5.2.1.  Two-Way Audio Only Session

   This common scenario shows SDP for secure Two-way audio session with
   Alice offering Opus, PCMU, PCMA and Bob accepting all the audio
   codecs offered.

   title 2-Way Audio Only Session

   participant Alice as Alice
   participant Bob as Bob

   Alice->Bob: Offer(Audio:Opus,PCMU,PCMA)
   Bob->Alice: Answer(Audio:Opus,PCMU,PCMA)
   Alice<->Bob: Two-way Opus Audio (preferred codec)

























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   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=alice 20518 0 IN IP4 0.0.0.0            | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 54609 RTP/SAVPF 109 0 8           | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] - Opus Codec |
   |                                           |  48khz, 2 channels    |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus] - Opus       |
   |                                           |  packetization of 20m |
   |                                           | s                     |
   | a=rtpmap:0 PCMU/8000                      | [RFC3551] PCMU Audio  |
   |                                           | Codec                 |
   | a=rtpmap:8 PCMA/8000                      | [RFC3551] PCMA Audio  |
   |                                           | Codec                 |
   | a=sendrecv                                | [RFC3264] - Alice can |
   |                                           | send and recv audio   |
   | a=setup:actpass                           | [RFC4145] - Alice can |
   |                                           | perform DTLS before   |
   |                                           | Answer arrives        |
   | a=rtcp-mux                                | [RFC5761] - Alice can |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 54609  |
   | b=AS:64                                   | [RFC4566] - Audio     |
   |                                           | Session B/W of 64kbps |
   | b=RS:800                                  | [RFC3556] - RTCP b/w  |
   |                                           | allocated to active   |
   |                                           | data senders          |
   | b=RR:2400                                 | [RFC3556] - RTCP b/w  |
   |                                           | allocated to          |
   |                                           | receivers             |
   | a=fingerprint:sha-1                       | [RFC5245] - DTLS      |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | Fingerprint for SRTP  |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=ice-ufrag:074c6550                      | [RFC5245] - ICE user  |
   |                                           | fragment              |




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   | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a0 | [RFC5245] - ICE       |
   | 68                                        | password              |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.4 54609 typ host                | Candidate             |
   | a=candidate:1 1 UDP 694302207             | [RFC5245] - Server    |
   | 24.23.204.141 54609 typ srflx raddr       | Reflexive ICE         |
   | 192.168.1.4 rport 54609                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.4 64678 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 24.23.204.141 64678 typ srflx raddr       | Reflexive Candidate   |
   | 192.168.1.4 rport 64678                   | for the Second Host   |
   |                                           | Candidate             |
   | a=rtcp-fb:109 nack                        | [RFC5104] - Indicates |
   |                                           | NACK RTCP feedback    |
   |                                           | support               |
   | a=ssrc:12345 cname:EocUG1f0fcg/yvY7       | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                         Table 1: 5.2.1 SDP Offer






























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   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=bob 16833 0 IN IP4 0.0.0.0              | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 49203 RTP/SAVPF 109 0 8           | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 98.248.92.77                    | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] Opus Codec   |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus] Packetizatio |
   |                                           | nof 20ms              |
   | a=rtpmap:0 PCMU/8000                      | [RFC3551] PCMU Audio  |
   |                                           | Codec                 |
   | a=rtpmap:8 PCMA/8000                      | [RFC3551] PCMA Audio  |
   |                                           | Codec                 |
   | a=sendrecv                                | [RFC3264] - Bob can   |
   |                                           | send and recv audio   |
   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=rtcp-mux                                | [RFC5761] - Bob can   |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 49203  |
   | b=AS:64                                   | [RFC4566] - Audio     |
   |                                           | Session b/w of 64kbps |
   | b=RS:800                                  | [RFC3556] - RTCP b/w  |
   |                                           | allocated to active   |
   |                                           | data senders          |
   | b=RR:2400                                 | [RFC3556] - RTCP b/w  |
   |                                           | allocated to          |
   |                                           | receivers             |
   | a=fingerprint:sha-1                       | [RFC5245] - DTLS      |
   | c9:c7:70:9d:1f:66:79:a8:07:99:41:49:83:4a | Fingerprint for SRTP  |
   | :97:0e:1f:ef:6d:f7                        |                       |
   | a=ice-ufrag:05067423                      | [RFC5245] - ICE user  |
   |                                           | fragment              |
   | a=ice-pwd:1747d1ee3474a28a397a4c3f3af08a0 | [RFC5245] - ICE       |
   | 68                                        | password parameter    |




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   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.7 49203 typ host                | Candidate for Opus    |
   |                                           | Stream                |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245] - Server    |
   | 98.248.92.77 49203 typ srflx raddr        | Reflexive ICE         |
   | 192.168.1.7 rport 49203                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.7 60065 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 98.248.92.77 60065 typ srflx raddr        | Reflexive Candidate   |
   | 192.168.1.7 rport 60065                   | for the Second Host   |
   |                                           | Candidate             |
   | a=rtcp-fb:109 nack                        | [RFC5104] - Indicates |
   |                                           | NACK RTCP feedback    |
   |                                           | support               |
   | a=ssrc:54321 cname:NWs1ao1HmN4Xa5/yvY7    | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                         Table 2: 5.2.1 SDP Answer

5.2.2.  Two-Way Audio/Video Session

   Alice and Bob establish an audio and video session with Opus as the
   audio codec and H.264 as the video codec.  This example also
   illustrates the negotiation of NACK based RTCP feedback mechanisms -
   PLI and FIR for the video session [RFC5104].

   title 2-Way Audio,Video with RTCP Feedback

   Alice->Bob: Offer(Audio:Opus,PCMU,PCMA Video:H.264,VP8)
   Bob->Alice: Answer(Audio:Opus, Video:H.264)
   Alice->Bob: Two-way Opus Audio, H.264 Video
   note right of Alice
     Session also suports RTCP feedback for audio and video streams
   end note

   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=alice 20518 0 IN IP4 0.0.0.0            | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 54609 RTP/SAVPF 109 0 8           | [RFC4566]             |





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   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] - Opus Codec |
   |                                           |  48khz, 2 channels    |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus] - Opus       |
   |                                           |  packetization of 20m |
   |                                           | s                     |
   | a=rtpmap:0 PCMU/8000                      | [RFC3551] PCMU Audio  |
   |                                           | Codec                 |
   | a=rtpmap:8 PCMA/8000                      | [RFC3551] PCMA Audio  |
   |                                           | Codec                 |
   | a=sendrecv                                | [RFC3264] - Alice can |
   |                                           | send and recv audio   |
   | a=setup:actpass                           | [RFC4145] - Alice can |
   |                                           | perform DTLS before   |
   |                                           | Answer arrives        |
   | a=rtcp-mux                                | [RFC5761] - Alice can |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 54609  |
   | a=ice-ufrag:074c6550                      | [RFC5245] - ICE user  |
   |                                           | fragment              |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a0 | [RFC5245] - ICE       |
   | 68                                        | password parameter    |
   | a=fingerprint:sha-1                       | [RFC5245] - DTLS      |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | Fingerprint for SRTP  |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.4 54609 typ host                | Candidate             |
   | a=candidate:1 1 UDP 694302207             | [RFC5245] - Server    |
   | 24.23.204.141 54609 typ srflx raddr       | Reflexive ICE         |
   | 192.168.1.4 rport 54609                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.4 64678 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 24.23.204.141 64678 typ srflx raddr       | Reflexive Candidate   |
   | 192.168.1.4 rport 64678                   | for the Second Host   |
   |                                           | Candidate             |
   | a=rtcp-fb:109 nack                        | [RFC5104] - Indicates |
   |                                           | NACK RTCP feedback    |
   |                                           | support               |
   | a=ssrc:12345 cname:EocUG1f0fcg/yvY7       | [RFC5576]             |



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   | m=video 62537 RTP/SAVPF 99 120            | [RFC4566]             |
   | a=msid:ma tb                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (tb)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:99 H264/90000                    | [RFC3984] - H.264     |
   |                                           | Video Codec           |
   | a=fmtp:99                                 | [RFC3984]             |
   | profile-level-id=4d0028;packetization-mod |                       |
   | e=1                                       |                       |
   | a=rtpmap:120 VP8/90000                    | [draft-ietf-payload-v |
   |                                           | p8] - VP8 video codec |
   | a=sendrecv                                | [RFC3264] - Alice can |
   |                                           | send and recv video   |
   | a=setup:actpass                           | [RFC4145] - Alice can |
   |                                           | perform DTLS before   |
   |                                           | Answer arrives        |
   | a=rtcp-mux                                | [RFC5761] - Alice can |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 62537  |
   | b=AS:256                                  | [RFC4566] - Audio     |
   |                                           | Session B/W of        |
   |                                           | 256kbps               |
   | b=RS:800                                  | [RFC3556] - RTCP b/w  |
   |                                           | allocated to active   |
   |                                           | data senders          |
   | b=RR:2400                                 | [RFC3556] - RTCP b/w  |
   |                                           | allocated to          |
   |                                           | receivers             |
   | a=ice-ufrag:6550074c                      | [RFC5245] - ICE user  |
   |                                           | fragment              |
   | a=ice-pwd:f31747d1ee3a28a397a4c3474af08a0 | [RFC5245] - ICE       |
   | 68                                        | password parameter    |
   | a=fingerprint:sha-1                       | [RFC5245] - DTLS      |
   | 4a:97:0e:1f:ef:99:41:49:83:6d:f7:c9:c7:70 | Fingerprint for SRTP  |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245]             |
   | 192.168.1.4 62537 typ host                |                       |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245]             |
   | 24.23.204.141 62537 typ srflx raddr       |                       |
   | 192.168.1.4 rport 62537                   |                       |
   | a=candidate:0 2 2113667326 192.168.1.4    | [RFC5245]             |
   | 54721 typ host                            |                       |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245]             |
   | 24.23.204.141 54721 typ srflx raddr       |                       |
   | 192.168.1.4 rport 54721                   |                       |



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   | a=rtcp-fb:99 nack                         | [RFC5104] - Indicates |
   |                                           | NACK RTCP feedback    |
   |                                           | support               |
   | a=rtcp-fb:99 nack pli                     | [RFC5104] - Indicates |
   |                                           | support for Picture   |
   |                                           | loss Indication and   |
   |                                           | NACK                  |
   | a=rtcp-fb:99 ccm fir                      | [RFC5104] - Full      |
   |                                           | Intra Frame           |
   |                                           | Request-Codec Control |
   |                                           | Message support       |
   | a=rtcp-fb:120 nack                        | [RFC5104] - Indicates |
   |                                           | NACK RTCP feedback    |
   |                                           | support               |
   | a=rtcp-fb:120 nack pli                    | [RFC5104] - Indicates |
   |                                           | support for Picture   |
   |                                           | loss Indication and   |
   |                                           | NACK                  |
   | a=rtcp-fb:120 ccm fir                     | [RFC5104] - Full      |
   |                                           | Intra Frame           |
   |                                           | Request-Codec Control |
   |                                           | Message support       |
   | a=ssrc:1366781083 cname:EocUG1f0fcg/yvY7  | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                         Table 3: 5.2.2 SDP Offer

























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   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=bob 16833 0 IN IP4 0.0.0.0              | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 49203 RTP/SAVPF 109               | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 98.248.92.77                    | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] - Bob accept |
   |                                           | sonly Opus Codec      |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=sendrecv                                | [RFC3264] - Bob can   |
   |                                           | send and recv audio   |
   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=rtcp-mux                                | [RFC5761] - Bob can   |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 49203  |
   | a=ice-ufrag:c300d85b                      | [RFC5245] - ICE       |
   |                                           | username frag         |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a | [RFC5245] - ICE       |
   | 2                                         | password              |
   | a=fingerprint:sha-1                       | [RFC5245] - DTLS      |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | Fingerprint for SRTP  |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.7 49203 typ host                | Candidate for Opus    |
   |                                           | Stream                |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245] - Server    |
   | 98.248.92.77 49203 typ srflx raddr        | Reflexive ICE         |
   | 192.168.1.7 rport 49203                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.7 60065 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 98.248.92.77 60065 typ srflx raddr        | Reflexive Candidate   |
   | 192.168.1.7 rport 60065                   | for the Second Host   |
   |                                           | Candidate             |



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   | a=ssrc:1366788312 cname:1f0fcgEocUG/yvY7  | [RFC5576]             |
   | m=video 63130 RTP/SAVPF 99                | [RFC4566]             |
   | a=msid:ma tb                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (tb)               |
   | c= IN IP4 98.248.92.771                   | [RFC4566]             |
   | a=rtpmap:99 H264/90000                    | [RFC3984] - Bob       |
   |                                           | accepts H.264 Video   |
   |                                           | Codec.                |
   | a=fmtp:99                                 | [RFC3984]             |
   | profile-level-id=4d0028;packetization-mod |                       |
   | e=1                                       |                       |
   | a=sendrecv                                | [RFC3264] - Bob can   |
   |                                           | send and recv video   |
   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=rtcp-mux                                | [RFC5761] - Bob can   |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 63130  |
   | a=ice-ufrag:0d85c30b                      | [RFC5245] - ICE       |
   |                                           | username frag         |
   | a=ice-pwd:291c325921d5de4e99bdd47efbabd9a | [RFC5245] - ICE       |
   | 2                                         | password              |
   | a=fingerprint:sha-1                       | [RFC5245] -DTLS       |
   | 0e:1f:ef:6d:f7:99:41:49:83:4a:97:c9:c7:70 | Fingerprint for SRTP  |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245]             |
   | 192.168.1.7 63130 typ host                |                       |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245]             |
   | 98.248.92.77 63130 typ srflx raddr        |                       |
   | 192.168.1.7 rport 63130                   |                       |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245]             |
   | 192.168.1.7 56607 typ host                |                       |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245]             |
   | 98.248.92.77 56607 typ srflx raddr        |                       |
   | 192.168.1.7 rport 56607                   |                       |
   | a=rtcp-fb:99 nack                         | [RFC5104] - Indicates |
   |                                           | support for NACK      |
   |                                           | based RTCP feedback   |
   | a=rtcp-fb:99 nack pli                     | [RFC5104] - Indicates |
   |                                           | support for Picture   |
   |                                           | loss Indication and   |
   |                                           | NACK                  |





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   | a=rtcp-fb:99 ccm fir                      | [RFC5104] - Full      |
   |                                           | Intra Frame           |
   |                                           | Request-Codec Control |
   |                                           | Message support       |
   | a=ssrc:3229706345 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                         Table 4: 5.2.2 SDP Answer

5.2.3.  Secure Two-Way Data Only Session

   This scenario illustrates SDP negotiated to setup a data-only session
   based on SCTP Data Channel, thus enabling use-cases such as file-
   transfer for example.

   title WebRTC Session - 2-Way Secure Audio,Video with RTCP Feedback
   Alice->Bob: Offer(DataChannel)
   Bob->Alice: Answer(Data-Channel)
   Alice->Bob: Two-way SCTP based Data-Channel

   +------------------------------------------+------------------------+
   | SDP Contents                             | RFC#/Notes             |
   +------------------------------------------+------------------------+
   | v=0                                      | [RFC4566]              |
   | o=alice 20518 0 IN IP4 0.0.0.0           | [RFC4566] - Session    |
   |                                          | Origin Information     |
   | s=                                       | [RFC4566]              |
   | t=0 0                                    | [RFC4566]              |
   | a=ice-ufrag:074c6550                     | [RFC5245] - Session    |
   |                                          | Level ICE parameter    |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a | [RFC5245] - Session    |
   | 068                                      | Level ICE parameter    |
   | a=fingerprint:sha-1                      | [RFC5245] - Session    |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:7 | DTLS Fingerprint for   |
   | 0:9d:1f:66:79:a8:07                      | SRTP                   |
   | m=application 56966 DTLS/SCTP 5000       | [draft-ietf-rtcweb-dat |
   |                                          | a-channel]             |
   | c= IN IP4 24.23.204.141                  | [RFC4566]              |
   | a=sctpmap:5000 webrtc-Datachannel 1      | [draft-ietf-mmusic-sct |
   |                                          | p-sdp] - One data      |
   |                                          |  stream of type chat   |
   | a=webrtc-Datachannel:5000                | [draft-ietf-mmusic-sct |
   | stream=1;label="channel                  | p-sdp]                 |
   | 1";subprotocol="chat";                   |                        |
   | a=setup:actpass                          | [RFC4145] - Alice can  |
   |                                          | perform DTLS before    |
   |                                          | Answer arrives         |




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   | a=sendrecv                               | [RFC3264] - Alice can  |
   |                                          | send and recv          |
   |                                          | non-media data         |
   | a=candidate:0 1 UDP 2113667327           | [RFC5245]              |
   | 192.168.1.7 56966 typ host               |                        |
   | a=candidate:1 1 UDP 1694302207           | [RFC5245]              |
   | 24.23.204.141 56966 typ srflx raddr      |                        |
   | 192.168.1.7 rport 56966                  |                        |
   | a=candidate:0 2 UDP 2113667326           | [RFC5245]              |
   | 192.168.1.7 51641 typ host               |                        |
   | a=candidate:1 2 UDP 1694302206           | [RFC5245]              |
   | 24.23.204.141 51641 typ srflx raddr      |                        |
   | 192.168.1.7 rport 51641                  |                        |
   +------------------------------------------+------------------------+

                         Table 5: 5.2.3 SDP Offer

   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=bob 16833 0 IN IP4 0.0.0.0              | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=application 55700 DTLS/SCTP 5000        | [draft-ietf-mmusic-sc |
   |                                           | tp-sdp]               |
   | c= IN IP4 98.248.92.771                   | [RFC4566]             |
   | a=sctpmap:5000 webrtc-Datachannel 1       | [draft-ietf-mmusic-sc |
   |                                           | tp-sdp]               |
   | a=webrtc-Datachannel:5000                 | [draft-ietf-mmusic-sc |
   | stream=1;label="channel                   | tp-sdp]               |
   | 1";subprotocol="chat";                    |                       |
   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=sendrecv                                | [RFC3264] - Bob can   |
   |                                           | send and recv         |
   |                                           | non-media data        |
   | a=ice-ufrag:c300d85b                      | [RFC5245] - Session   |
   |                                           | Level ICE username    |
   |                                           | frag                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a | [RFC5245] - Session   |
   | 2                                         | Level ICE password    |
   | a=fingerprint:sha-1                       | [RFC5245] - Session   |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | DTLS Fingerprint for  |
   | :9d:1f:66:79:a8:07                        | SRTP                  |




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   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Refer 4.1 |
   | 192.168.1.7 55700 typ host                | SDP Offer             |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245] Refer 4.1   |
   | 98.248.92.77 55700 typ srflx raddr        | SDP Offer             |
   | 192.168.1.7 rport 55700                   |                       |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] Refer 4.1   |
   | 192.168.1.7 58137 typ host                | SDP Offer             |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] Refer 4.1   |
   | 98.248.92.77 58137 typ srflx raddr        | SDP Offer             |
   | 192.168.1.7 rport 581371                  |                       |
   +-------------------------------------------+-----------------------+

                         Table 6: 5.2.3 SDP Answer

5.2.4.  Audio Call On Hold

   Alice calls Bob, but when Bob answers he places Alice on hold by
   setting the SDP direction attribute to a=sendonly in the Answer.

   title Secure 2-Way Audio Only Session
   participant Alice as Alice
   participant Bob as Bob
   Alice->Bob: Offer(Audio:Opus)
   Bob->Alice: Answer(Audio:Opus,a=sendonly)
   Alice->Bob: One-way Opus Audio (preferred codec)


























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   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=alice 20518 0 IN IP4 0.0.0.0            | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 54609 RTP/SAVPF 109               | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] - Opus Codec |
   |                                           |  48khz, 2 channels    |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus] - Opus       |
   |                                           |  packetization of 20m |
   |                                           | s                     |
   | a=sendrecv                                | [RFC3264] - Alice can |
   |                                           | send and recv audio   |
   | a=setup:actpass                           | [RFC4145] - Alice can |
   |                                           | perform DTLS before   |
   |                                           | Answer arrives        |
   | a=rtcp-mux                                | [RFC5761] - Alice can |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 54609  |
   | a=ice-ufrag:074c6550                      | [RFC5245] - ICE user  |
   |                                           | fragment              |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a0 | [RFC5245] - ICE       |
   | 68                                        | password              |
   | a=fingerprint:sha-1                       | [RFC5245] - DTLS      |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | Fingerprint for SRTP  |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.4 54609 typ host                | Candidate             |
   | a=candidate:1 1 UDP 694302207             | [RFC5245] - Server    |
   | 24.23.204.141 54609 typ srflx raddr       | Reflexive ICE         |
   | 192.168.1.4 rport 54609                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.4 64678 typ host                | Host Candidate        |






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   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 24.23.204.141 64678 typ srflx raddr       | Reflexive Candidate   |
   | 192.168.1.4 rport 64678                   | for the Second Host   |
   |                                           | Candidate             |
   | a=rtcp-fb:109 nack                        | [RFC5104] - Indicates |
   |                                           | NACK RTCP feedback    |
   |                                           | support               |
   | a=ssrc:3229706345 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                         Table 7: 5.2.4 SDP Offer

   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=bob 16833 0 IN IP4 0.0.0.0              | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 49203 RTP/SAVPF 109               | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 98.248.92.77                    | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] - Bob accept |
   |                                           | sonly Opus Codec      |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=sendonly                                | [RFC3264] - Bob puts  |
   |                                           | call On Hold          |
   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=rtcp-mux                                | [RFC5761] - Bob can   |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 49203  |
   | a=ice-ufrag:c300d85b                      | [RFC5245] - ICE       |
   |                                           | username frag         |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a | [RFC5245] - ICE       |
   | 2                                         | password              |
   | a=fingerprint:sha-1                       | [RFC5245] - DTLS      |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | Fingerprint for SRTP  |
   | :9d:1f:66:79:a8:07                        |                       |




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   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.7 49203 typ host                | Candidate for Opus    |
   |                                           | Stream                |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245] - Server    |
   | 98.248.92.77 49203 typ srflx raddr        | Reflexive ICE         |
   | 192.168.1.7 rport 49203                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.7 60065 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 98.248.92.77 60065 typ srflx raddr        | Reflexive Candidate   |
   | 192.168.1.7 rport 60065                   | for the Second Host   |
   |                                           | Candidate             |
   | a=ssrc:1366781083 cname:EocUG1f0fcg/yvY7  | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                         Table 8: 5.2.4 SDP Answer

5.2.5.  Audio with DTMF Session

   In this example, Alice wishes to establish two separate audio
   streams, one for normal audio and the other for telephone-events.
   Alice offers first audio stream with three codecs and the other with
   [RFC2833] tones (for DTMF).  Bob accepts both the audio streams by
   choosing Opus as the audio codec and the telephone-event for the
   other stream.

   title Audio Session with DTMF
   participant Alice as Alice
   participant Bob as Bob
   Alice->Bob: Offer(Audio:Opus,PCMU,PCMA Audio:telephone-event)
   Bob->Alice: Answer(Audio:Opus, Audio:telephone-event)
   Alice->Bob: Opus audio stream and telephone-event stream


















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   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=alice 20518 0 IN IP4 0.0.0.0            | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 54609 RTP/SAVPF 109 0 8           | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] - Opus Codec |
   |                                           |  48khz, 2 channels    |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus] - Opus       |
   |                                           |  packetization of 20m |
   |                                           | s                     |
   | a=rtpmap:0 PCMU/8000                      | [RFC3551] PCMU Audio  |
   |                                           | Codec                 |
   | a=rtpmap:8 PCMA/8000                      | [RFC3551] PCMA Audio  |
   |                                           | Codec                 |
   | a=sendrecv                                | [RFC3264] - Alice can |
   |                                           | send and recv audio   |
   | a=setup:actpass                           | [RFC4145] - Alice can |
   |                                           | perform DTLS before   |
   |                                           | Answer arrives        |
   | a=rtcp-mux                                | [RFC5761] - Alice can |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 54609  |
   | a=ice-ufrag:074c6550                      | [RFC5245] - ICE user  |
   |                                           | fragment              |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a0 | [RFC5245] - ICE       |
   | 68                                        | password parameter    |
   | a=fingerprint:sha-1                       | [RFC5245] - DTLS      |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | Fingerprint for SRTP  |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.4 54609 typ host                | Candidate             |
   | a=candidate:1 1 UDP 694302207             | [RFC5245] - Server    |
   | 24.23.204.141 54609 typ srflx raddr       | Reflexive ICE         |
   | 192.168.1.4 rport 54609                   | Candidate for the     |
   |                                           | above host candidate  |




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   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.4 64678 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 24.23.204.141 64678 typ srflx raddr       | Reflexive Candidate   |
   | 192.168.1.4 rport 64678                   | for the Second Host   |
   |                                           | Candidate             |
   | a=rtcp-fb:109 nack                        | [RFC5104] - Indicates |
   |                                           | NACK RTCP feedback    |
   |                                           | support               |
   | a=ssrc:3229706345 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]             |
   | m=audio 54690 RTP/SAVPF 126               | [RFC4566]             |
   | a=msid:ma tb                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (tb)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:126 telephone-event/8000         | [RFC2833]             |
   | a=sendonly                                | [RFC3264] - Alice can |
   |                                           | send DTMF Events      |
   | a=setup:actpass                           | [RFC4145] - Alice can |
   |                                           | perform DTLS before   |
   |                                           | Answer arrives        |
   | a=rtcp-mux                                | [RFC5761]             |
   | a=ice-ufrag:6550074c                      | [RFC5245] - ICE user  |
   |                                           | fragment              |
   | a=ice-pwd:31747d1eea28a397a4af08a068      | [RFC5245] - ICE       |
   |                                           | password parameter    |
   | a=fingerprint:sha-1                       | [RFC5245] - DTLS      |
   | 0e:1f:ef:6d:f7:99:41:49:83:4a:97:c9:c7:70 | Fingerprint for SRTP  |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.4 54690 typ host                | Candidate             |
   | a=candidate:1 1 UDP 694302207             | [RFC5245] - Server    |
   | 24.23.204.141 54690 typ srflx raddr       | Reflexive ICE         |
   | 192.168.1.4 rport 54690                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.4 64678 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 24.23.204.141 64678 typ srflx raddr       | Reflexive Candidate   |
   | 192.168.1.4 rport 64678                   | for the Second Host   |
   |                                           | Candidate             |
   | a=rtcp-fb:109 nack                        | [RFC5104] - Indicates |
   |                                           | NACK RTCP feedback    |
   |                                           | support               |
   | a=ssrc:9032206345 cname:L/N9lk1ao1HmN4Xa5 | [RFC5576]             |
   +-------------------------------------------+-----------------------+



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                         Table 9: 5.2.5 SDP Offer

   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=bob 16833 0 IN IP4 0.0.0.0              | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 49203 RTP/SAVPF 109               | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 98.248.92.77                    | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] - Bob accept |
   |                                           | sOpus Codec           |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=sendrecv                                | [RFC3264] - Bob can   |
   |                                           | send and receive Opus |
   |                                           | audio                 |
   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=rtcp-mux                                | [RFC5761] - Bob can   |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 49203  |
   | a=ice-ufrag:c300d85b                      | [RFC5245] - ICE       |
   |                                           | username frag         |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a | [RFC5245] - ICE       |
   | 2                                         | password              |
   | a=fingerprint:sha-1                       | [RFC5245] -           |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | Fingerprint for SRTP  |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.7 49203 typ host                | Candidate for Opus    |
   |                                           | Stream                |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245] - Server    |
   | 98.248.92.77 49203 typ srflx raddr        | Reflexive ICE         |
   | 192.168.1.7 rport 49203                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.7 60065 typ host                | Host Candidate        |




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   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 98.248.92.77 60065 typ srflx raddr        | Reflexive Candidate   |
   | 192.168.1.7 rport 60065                   | for the Second Host   |
   |                                           | Candidate             |
   | a=ssrc:0634322975 cname:Q/o1HmN4XNWs1aa5  | [RFC5576]             |
   | m=audio 54690 RTP/SAVPF 126               | [RFC4566]             |
   | a=msid:ma tb                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (tb)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:126 telephone-event/8000         | [RFC2833]             |
   | a=recvonly                                | [RFC3264] - Alice can |
   |                                           | receive DTMF events   |
   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=rtcp-mux                                | [RFC5761] - Alice can |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 54690  |
   | a=ice-ufrag:c3d85b00                      | [RFC5245] - ICE       |
   |                                           | username frag         |
   | a=ice-pwd:bd291c32de4e995921d5d47efbabd9a | [RFC5245] - Session   |
   | 2                                         | Level ICE password    |
   | a=fingerprint:sha-1                       | [RFC5245] - DTLS      |
   | 83:4a:97:0e:1f99:41:49:ef:6d:f7:c9:c7:70: | Fingerprint for SRTP  |
   | 9d:1f:66:79:a8:07                         |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.7 49203 typ host                | Candidate for Opus    |
   |                                           | Stream                |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245] - Server    |
   | 98.248.92.77 49203 typ srflx raddr        | Reflexive ICE         |
   | 192.168.1.7 rport 49203                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.7 60065 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 98.248.92.77 60065 typ srflx raddr        | Reflexive Candidate   |
   | 192.168.1.7 rport 60065                   | for the Second Host   |
   |                                           | Candidate             |
   | a=ssrc:6345903220 cname:L/k1aN9lo1HmN4Xa5 | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                        Table 10: 5.2.5 SDP Answer






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5.2.6.  One Way Audio/Video Session - Document Camera

   In this scenario Alice and Bob engage in 1 way audio and video
   session with Bob receiving Alice's audio and her presentation slides
   as video stream.

   title 1 Way Audio & Video Session - Document Camera

   note right of Alice
   Alice Offers sendonly audio and video streams.
   The video stream corresponds to her presentation
   slides via a=content SDP attribute)
   end note
   Alice->Bob: Offer(Audio:Opus, Video: VP8)
   note left of Bob
   Bob accepts Alice's offer
   end note
   Bob->Alice: Answer(Audio:Opus, Video: VP8)
   Alice->Bob: One-way Opus Audio, VP8 Video
   note right of Alice
   Bob can hear Alice and see her presentation slides.
   end note





























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   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=alice 20519 0 IN IP4 0.0.0.0            | [RFC4566]             |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 54609 RTP/SAVPF 109               | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=sendonly                                | [RFC3264] - Send only |
   |                                           | audio stream          |
   | a=setup:actpass                           | [RFC4145] - Alice can |
   |                                           | perform DTLS before   |
   |                                           | Answer arrives        |
   | a=rtcp-mux                                | [RFC5761]             |
   | a=ice-ufrag:074c6550                      | [RFC5245]             |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a0 | [RFC5245]             |
   | 68                                        |                       |
   | a=fingerprint:sha-1                       | [RFC5245]             |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 |                       |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245]             |
   | 192.168.1.4 54609 typ host                |                       |
   | a=candidate:0 2 UDP 2113667326            | [RFC5104]             |
   | 192.168.1.4 64678 typ host                |                       |
   | a=rtcp-fb:109 nack                        | [RFC5104]             |
   | a=ssrc:6345903220 cname:L/k1aN9lo1HmN4Xa5 | [RFC5576]             |
   | m=video 62537 RTP/SAVPF 120               | [RFC4566]             |
   | a=msid:ma tb                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (tb)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:120 VP8/90000                    | [draft-ietf-payload-v |
   |                                           | p8]                   |
   | a=content:slides                          | [RFC4796] -Alice's    |
   |                                           | presentation video    |
   |                                           | stream                |



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   | a=sendonly                                | [RFC3264] - Send only |
   |                                           | video stream          |
   | a=setup:actpass                           | [RFC4145] - Alice can |
   |                                           | perform DTLS before   |
   |                                           | Answer arrives        |
   | a=rtcp-mux                                | [RFC5761]             |
   | a=ice-ufrag:6550074c                      | [RFC5245]             |
   | a=ice-pwd:1747d1ee3474af08a068a28a397a4c3 | [RFC5245]             |
   | f3                                        |                       |
   | a=fingerprint:sha-1                       | [RFC5245]             |
   | 1f:ef:6d:f7:c9:c7:70:9d:1f:66:79:a8:07:99 |                       |
   | :41:49:83:4a:97:0e                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245]             |
   | 192.168.1.4 62537 typ host                |                       |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245]             |
   | 192.168.1.4 54721 typ host                |                       |
   | a=rtcp-fb:120 nack                        | [RFC5104]             |
   | a=rtcp-fb:120 nack pli                    | [RFC5104]             |
   | a=rtcp-fb:120 ccm fir                     | [RFC5104]             |
   | a=ssrc:3429951804 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                         Table 11: 5.2.6 SDP Offer




























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   +--------------------------------------------+----------------------+
   | SDP Contents                               | RFC#/Notes           |
   +--------------------------------------------+----------------------+
   | v=0                                        | [RFC4566]            |
   | o=bob 16833 0 IN IP4 0.0.0.0               | [RFC4566]            |
   | s=                                         | [RFC4566]            |
   | t=0 0                                      | [RFC4566]            |
   | m=audio 49203 RTP/SAVPF 109                | [RFC4566]            |
   | a=msid:ma ta                               | Identifies           |
   |                                            | RTCMediaStream ID    |
   |                                            | (ma) and             |
   |                                            | RTCMediaStreamTrack  |
   |                                            | ID (ta)              |
   | c= IN IP4 98.248.92.77                     | [RFC4566]            |
   | a=rtpmap:109 opus/48000/2                  | [draft-ietf-payload- |
   |                                            | rtp-opus]            |
   | a=ptime:20                                 | [draft-ietf-payload- |
   |                                            | rtp-opus]            |
   | a=recvonly                                 | [RFC3264] - Receive  |
   |                                            | only audio stream    |
   | a=setup:active                             | [RFC4145] - Bob      |
   |                                            | carries out DTLS     |
   |                                            | Handshake in         |
   |                                            | parallel             |
   | a=rtcp-mux                                 | [RFC5761]            |
   | a=ice-ufrag:c300d85b                       | [RFC5245]            |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a2 | [RFC5245]            |
   | a=fingerprint:sha-1                        | [RFC5245]            |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70: |                      |
   | 9d:1f:66:79:a8:07                          |                      |
   | a=candidate:0 1 UDP 2113667327 192.168.1.7 | [RFC5245]            |
   | 49203 typ host                             |                      |
   | a=candidate:0 2 UDP 2113667326 192.168.1.7 | [RFC5245]            |
   | 60065 typ host                             |                      |
   | a=ssrc:9513429804 cname:Q/o1HmNWs1aN4Xa5   | [RFC5576]            |
   | m=video 63130 RTP/SAVPF 120                | [RFC4566]            |
   | a=msid:ma tb                               | Identifies           |
   |                                            | RTCMediaStream ID    |
   |                                            | (ma) and             |
   |                                            | RTCMediaStreamTrack  |
   |                                            | ID (tb)              |
   | c= IN IP4 98.248.92.771                    | [RFC4566]            |
   | a=rtpmap:120 VP8/90000                     | [draft-ietf-payload- |
   |                                            | vp8]                 |
   | a=content:slides                           | [RFC4796]            |
   | a=recvonly                                 | [RFC3264] - Receive  |
   |                                            | Only Alice's         |
   |                                            | presentation stream  |



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   | a=setup:active                             | [RFC4145] - Bob      |
   |                                            | carries out DTLS     |
   |                                            | Handshake in         |
   |                                            | parallel             |
   | a=rtcp-mux                                 | [RFC5761]            |
   | a=ice-ufrag:85bc300d                       | [RFC5245]            |
   | a=ice-pwd:325921d5d47efbabd9ade4e99bd291c2 | [RFC5245]            |
   | a=fingerprint:sha-1                        | [RFC5245]            |
   | ef:6d:f7:c9:c7:70:9d:1h:99:41:49:83:4a:97: |                      |
   | 0e:1f:1f:66:79:a8:07                       |                      |
   | a=candidate:0 1 UDP 2113667327 192.168.1.7 | [RFC5245]            |
   | 63130 typ host                             |                      |
   | a=candidate:0 2 UDP 2113667326 192.168.1.7 | [RFC5245]            |
   | 56607 typ host                             |                      |
   | a=ssrc:1366781083 cname:EocUG1f0fcg/yvY7   | [RFC5576]            |
   +--------------------------------------------+----------------------+

                        Table 12: 5.2.6 SDP Answer

5.3.  Stream Mutiplexing Examples

   The examples in this section show-cases using
   [draft-ietf-mmusic-sdp-bundle-negotiation] BUNDLE negotiation
   framework for the usage of a single 5-tuple for media associated with
   multiple SDP media descriptions ("m=" lines).

5.3.1.  Audio, Video Session with BUNDLE Support Unknown

   In this example, since Alice is unsure of the Bob's support for
   BUNDLE framework, following 3 step procedures are performed in order
   to negotiate and setup a unique BUNDLE Address for the session
   o  An SDP Offer, in which the Alice assigns unique addresses to each
      "m=" line in the BUNDLE group, and requests the Answerer to select
      the Offerer's BUNDLE address.
   o  An SDP Answer, in which the Bob selects the BUNDLE address for the
      Offerer, and assigns its own local BUNDLE address to each "m="
      line in the BUNDLE group.
   o  A subsequent SDP Offer from Alice, which is used to perform a
      BUNDLE Address Synchronization (BAS).
   Once the Offer/Answer exchange completes, both Alice and Bob each end
   up using single RTP Session for both the Media Streams.










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title 2-Way Secure Audio,Video with BUNDLE support unknown

Alice->Bob: Offer(Audio:Opus Video:VP8)
note right of Alice
Alice offers BUNDLE support with unique address for the audio and video m-line
end note

Bob->Alice: Answer(Audio:Opus Video:VP8) indicating its support for BUNDLE
note left of Bob
Bob uses identical addresses across the m=lines
end note

Alice->Bob: Updated Offer(Audio:Opus Video:VP8) for Bundle Address Synchronzation.

Alice <-> Bob: 2Way Call with Audio and Video Multiplexed




































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   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20518 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE audio video           | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | a=mid:audio                          | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:11111 cname:EocUG1f0fcg/yvY7  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |



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   | m=video 62537 RTP/SAVPF 120          | [RFC4566]                  |
   | a=mid:video                          | [RFC5888] Video m=line     |
   |                                      | part of the Bundle group   |
   |                                      | with a unique port number  |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=rtpmap:120 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:22222 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ice-ufrag:6550074c                 | [RFC5245]                  |
   | a=ice-pwd:74af08a068a28a397a4c3f3174 | [RFC5245]                  |
   | 7d1ee34                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 1f:ef:6d:f7:c9:c7:70:9d:1f:66:99:41: |                            |
   | 49:83:4a:97:0e79:a8:07               |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 62537 typ host           |                            |
   | a=candidate:1 1 UDP 1694302207       | [RFC5245]                  |
   | 24.23.204.141 62537 typ srflx raddr  |                            |
   | 192.168.1.4 rport 62537              |                            |
   | a=candidate:0 2 2113667326           | [RFC5245]                  |
   | 192.168.1.4 54721 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 54721 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54721              |                            |
   | a=rtcp-fb:120 nack                   | [RFC5104]                  |
   | a=rtcp-fb:120 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:120 ccm fir                | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                    Table 13: 5.3.1 SDP Offer w/BUNDLE

   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=bob 16833 0 IN IP4 0.0.0.0         | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |





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   | a=group:BUNDLE audio video           | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Bob       |
   |                                      |  supports BUNDLE semantics |
   |                                      | .                          |
   | m=audio 49203 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | a=mid:audio                          | [RFC5888] Audio m=line     |
   |                                      | part of the BUNDLE group   |
   | c= IN IP4 98.248.92.77               | [RFC4566]                  |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:33333 cname:Q/1HmN4Xa5NWs1ao  | [RFC5576]                  |
   | a=ice-ufrag:c300d85b                 | [RFC5245]                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.7 49203 typ host           |                            |
   | a=candidate:1 1 UDP 1694302207       | [RFC5245]                  |
   | 98.248.92.77 49203 typ srflx raddr   |                            |
   | 192.168.1.7 rport 49203              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.7 60065 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 98.248.92.77 60065 typ srflx raddr   |                            |
   | 192.168.1.7 rport 60065              |                            |
   | m=video 49203 RTP/SAVPF 120          | [RFC4566]                  |
   | a=mid:video                          | [RFC5888] Video m=line     |
   |                                      | part of the BUNDLE group   |
   |                                      | with the port from audio   |
   |                                      | line repeated              |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |



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   | b=AS:1756                            | [RFC4566]                  |
   | c= IN IP4 98.248.92.77               | [RFC4566]                  |
   | a=rtpmap:120 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:44444 cname:Q/2AqlmN4Xa5NWs   | [RFC5576]                  |
   | a=ice-ufrag:85bc300d                 | [RFC5245]                  |
   | a=ice-pwd:bd2de4e9991c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 41:49:83:4a:99:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245] - Candidate      |
   | 192.168.1.7 49203 typ host           | lines identical with the   |
   |                                      | audio m-line.              |
   | a=candidate:1 1 UDP 1694302207       | [RFC5245]                  |
   | 98.248.92.77 49203 typ srflx raddr   |                            |
   | 192.168.1.7 rport 49203              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.7 60065 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 98.248.92.77 60065 typ srflx raddr   |                            |
   | 192.168.1.7 rport 60065              |                            |
   | a=rtcp-fb:120 nack                   | [RFC5104]                  |
   | a=rtcp-fb:120 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:120 ccm fir                | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                    Table 14: 5.3.1 SDP Answer w/BUNDLE



















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   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20518 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE audio video           | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation]           |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | a=mid:audio                          | [RFC5888] - Port number    |
   |                                      | finalized as Bundle        |
   |                                      | Address.                   |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:11111 cname:EocUG1f0fcg/yvY7  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | m=video 54609 RTP/SAVPF 120          | [RFC4566]                  |





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   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | a=mid:video                          | [RFC5888] - Same Bundle    |
   |                                      | address from the audio     |
   |                                      | m=line                     |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=rtpmap:120 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:22222 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=rtcp-fb:120 nack                   | [RFC5104]                  |
   | a=rtcp-fb:120 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:120 ccm fir                | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                     Table 15: 5.3.1 SDP Offer for BAS

5.3.2.  Audio, Video w/BUNDLE Support Known

   This use-case is a successful audio and video stream multiplexing
   scenario, with Alice and Bob aware of each others support for SDP
   BUNDLE framework [draft-ietf-mmusic-sdp-bundle-negotiation].








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title 2-Way Secure Audio, Video with BUNDLE support Known

Alice->Bob: Offer(Audio:Opus Video:VP8)
note right of Alice
Alice offers BUNDLE support with identical address across m-lines.
end note

Bob->Alice: Answer(Audio:Opus Video:VP8) indicating its support for BUNDLE
note left of Bob
Bob uses identical addresses across the m=lines
end note

Alice <-> Bob: 2Way Call with Audio and Video Multiplexed






































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   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20518 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE audio video           | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics.                |
   | m=audio 10000 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | a=mid:audio                          | [RFC5888] - Audio m=line   |
   |                                      | part of BUNDLE group       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=sendrecv                           | [RFC3264]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:11111 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 10000 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 10000 typ srflx raddr  |                            |
   | 192.168.1.4 rport 10000              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | m=video 10000 RTP/SAVPF 120          | [RFC4566]                  |



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   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | a=mid:video                          | [RFC5888] - Video m=line   |
   |                                      | with Bundle address same   |
   |                                      | as the audio m=line        |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=rtpmap:120 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:22222 cname:Q/1HmN4Xa5NWs1ao  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 10000 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 10000 typ srflx raddr  |                            |
   | 192.168.1.4 rport 10000              |                            |
   | a=candidate:0 2 2113667326           | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=rtcp-fb:120 nack                   | [RFC5104]                  |
   | a=rtcp-fb:120 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:120 ccm fir                | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                    Table 16: 5.3.2 SDP Offer w/BUNDLE














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   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=bob 16833 0 IN IP4 0.0.0.0         | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE audio video           | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] - Bob     |
   |                                      |  supports BUNDLE semantics |
   |                                      | .                          |
   | m=audio 20000 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | a=mid:audio                          | [RFC5888] - Audio m=line   |
   |                                      | part of the BUNDLE group   |
   | c= IN IP4 98.248.92.77               | [RFC4566]                  |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:33333 cname:EocUG1f0fcg/yvY7  | [RFC5576]                  |
   | a=ice-ufrag:c300d85b                 | [RFC5245]                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.7 20000 typ host           |                            |
   | a=candidate:1 1 UDP 1694302207       | [RFC5245]                  |
   | 98.248.92.77 20000 typ srflx raddr   |                            |
   | 192.168.1.7 rport 20000              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.7 60065 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 98.248.92.77 60065 typ srflx raddr   |                            |
   | 192.168.1.7 rport 60065              |                            |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | m=video 20000 RTP/SAVPF 120          | [RFC4566]                  |




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   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | a=mid:video                          | [RFC5888] - Video m=line   |
   |                                      | with Bundle address same   |
   |                                      | as the audio m=line        |
   | c= IN IP4 98.248.92.77               | [RFC4566]                  |
   | a=rtpmap:120 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:44444 cname:1f0fcgEocUG/yvY7  | [RFC5576]                  |
   | a=ice-ufrag:c300d85b                 | [RFC5245]                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.7 20000 typ host           |                            |
   | a=candidate:1 1 UDP 1694302207       | [RFC5245]                  |
   | 98.248.92.77 20000 typ srflx raddr   |                            |
   | 192.168.1.7 rport 20000              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.7 60065 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 98.248.92.77 60065 typ srflx raddr   |                            |
   | 192.168.1.7 rport 60065              |                            |
   | a=rtcp-fb:120 nack                   | [RFC5104]                  |
   | a=rtcp-fb:120 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:120 ccm fir                | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                    Table 17: 5.3.2 SDP Answer w/BUNDLE

5.3.3.  Audio, Video and Data BUNDLE

   This example show-cases SDP for negotiating a session with Audio,
   Video and data streams between Alice and Bob with
   [draft-ietf-mmusic-sdp-bundle-negotiation] support known








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title Audio, Video, Data with BUNDLE support known

Alice->Bob: Offer(Audio:Opus, Video:VP8, Data)
note right of Alice
Alice indicates BUNDLE support with identical address across all the m=lines.
end note

Bob->Alice: Answer(Audio:Opus Video:VP8, Data)
note left of Bob
Bob does the same
end note
Alice<->Bob: Two way Audio, Video and Data multiplexed

   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20518 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE audio video data      | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation]           |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:audio                          | [RFC5888]                  |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |




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   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=ssrc:11111 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | m=video 54609 RTP/SAVPF 120          | [RFC4566]                  |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:video                          | [RFC5888]                  |
   | a=rtpmap:120 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=rtcp-fb:120 nack                   | [RFC5104]                  |
   | a=rtcp-fb:120 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:120 ccm fir                | [RFC5104]                  |
   | a=ssrc:22222 cname:Q/aoNWs11HmN4Xa5  | [RFC5576]                  |
   | m=application 54609 DTLS/SCTP 5000   | [draft-ietf-rtcweb-data-ch |
   |                                      | annel]                     |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:data                           | [RFC5888]                  |
   | a=sctpmap:5000 webrtc-Datachannel 1  | [draft-ietf-mmusic-sctp-sd |
   |                                      | p]                         |
   | a=webrtc-Datachannel:5000            | [draft-ietf-mmusic-sctp-sd |
   | stream=1;label="channel              | p]                         |
   | 1";subprotocol="chat";               |                            |
   | a=sendrecv                           | [RFC3264]                  |



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   | a=setup:actpass                      | [RFC4145]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   +--------------------------------------+----------------------------+

                         Table 18: 5.3.3 SDP Offer

   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=bob 16833 0 IN IP4 0.0.0.0         | [RFC4566] - Session Origin |
   |                                      | Information                |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE audio video data      | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation]           |
   | m=audio 49203 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | c= IN IP4 98.248.92.77               | [RFC4566]                  |
   | a=mid:audio                          | [RFC5888]                  |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=ice-ufrag:c300d85b                 | [RFC5245]                  |




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   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.7 49203 typ host           |                            |
   | a=candidate:1 1 UDP 1694302207       | [RFC5245]                  |
   | 98.248.92.77 49203 typ srflx raddr   |                            |
   | 192.168.1.7 rport 49203              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.7 60065 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 98.248.92.77 60065 typ srflx raddr   |                            |
   | 192.168.1.7 rport 60065              |                            |
   | a=ssrc:33333 cname:L/aoNWs11HmN4Xa5  | [RFC5576]                  |
   | m=video 49203 RTP/SAVPF 120          | [RFC4566]                  |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | c= IN IP4 98.248.92.771              | [RFC4566]                  |
   | a=mid:video                          | [RFC5888]                  |
   | a=rtpmap:120 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ice-ufrag:c300d85b                 | [RFC5245]                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.7 49203 typ host           |                            |
   | a=candidate:1 1 UDP 1694302207       | [RFC5245]                  |
   | 98.248.92.77 49203 typ srflx raddr   |                            |
   | 192.168.1.7 rport 49203              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.7 60065 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 98.248.92.77 60065 typ srflx raddr   |                            |
   | 192.168.1.7 rport 60065              |                            |
   | a=rtcp-fb:120 nack                   | [RFC5104]                  |
   | a=rtcp-fb:120 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:120 ccm fir                | [RFC5104]                  |
   | a=ssrc:44444 cname:EocUG1f0fcg/yvY7  | [RFC5576]                  |




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   | m=application 49203 DTLS/SCTP 5000   | [draft-ietf-mmusic-sctp-sd |
   |                                      | p]                         |
   | c= IN IP4 98.248.92.771              | [RFC4566]                  |
   | a=mid:data                           | [RFC5888]                  |
   | a=sctpmap:5000 webrtc-Datachannel 1  | [draft-ietf-mmusic-sctp-sd |
   |                                      | p]                         |
   | a=webrtc-Datachannel:5000            | [draft-ietf-mmusic-sctp-sd |
   | stream=1;label="channel              | p]                         |
   | 1";subprotocol="chat";               |                            |
   | a=setup:active                       | [RFC4145]                  |
   | a=sendrecv                           | [RFC3264]                  |
   | a=ice-ufrag:c300d85b                 | [RFC5245]                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245] - Session Level  |
   | abd9a2                               | ICE password               |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.7 49203 typ host           |                            |
   | a=candidate:1 1 UDP 1694302207       | [RFC5245]                  |
   | 98.248.92.77 49203 typ srflx raddr   |                            |
   | 192.168.1.7 rport 49203              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.7 60065 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 98.248.92.77 60065 typ srflx raddr   |                            |
   | 192.168.1.7 rport 60065              |                            |
   +--------------------------------------+----------------------------+

                        Table 19: 5.3.3 SDP Answer

5.3.4.  Secure Two-Way Audio,Video w/BUNDLE Unsupported

   This use-case illustrates SDP Offer/Answer exchange when the far-end
   (Bob) either doesn't support media bundling or doesn't want to group
   m=lines over a single 5-tuple.

   On successful Offer/Answer exchange, Alice and Bob each end up using
   separate RTP streams for audio and video media streams respectively.












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title 2-Way Secure Audio,Video with BUNDLE Unsupported

Alice->Bob: Offer(Audio:Opus Video:VP8)
note right of Alice
Alice offers BUNDLE support with unique address for the audio and video m-line
end note

Bob->Alice: Answer(Audio:Opus Video:VP8)
note left of Bob
Bob uses unique addresses as well since he doesn't understand BUNDLE
end note

Alice <-> Bob: 2Way Call with Audio and Video on different addresses.






































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   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20518 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE audio video           | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 55232 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | a=mid:audio                          | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=sendrecv                           | [RFC3264]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=ssrc:11111 cname:EocUG1f0fcg/yvY7  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 55232 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 55232 typ srflx raddr  |                            |
   | 192.168.1.4 rport 55232              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |



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   | m=video 54332 RTP/SAVPF 120          | [RFC4566]                  |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | a=mid:video                          | [RFC5888] Video m=line     |
   |                                      | part of the BUNDLE group   |
   |                                      | with a unique port number  |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=rtpmap:120 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:22222 cname:yvY7/EocUG1f0fcg  | [RFC5576]                  |
   | a=ice-ufrag:7872093                  | [RFC5245]                  |
   | a=ice-pwd:ee3474af08a068a28a397a4c3f | [RFC5245]                  |
   | 31747d1                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 6d:f7:c9:c7:70:9d:1f:66:79:a8:07:99: |                            |
   | 41:49:83:4a:97:0e:1f:ef              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54332 typ host           |                            |
   | a=candidate:1 1 UDP 1694302207       | [RFC5245]                  |
   | 24.23.204.141 54332 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54332              |                            |
   | a=candidate:0 2 2113667326           | [RFC5245]                  |
   | 192.168.1.4 54721 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 54721 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54721              |                            |
   | a=rtcp-fb:120 nack                   | [RFC5104]                  |
   | a=rtcp-fb:120 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:120 ccm fir                | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                    Table 20: 5.3.4 SDP Offer w/BUNDLE













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   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=bob 16833 0 IN IP4 0.0.0.0              | [RFC4566]             |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 53214 RTP/SAVPF 109               | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 98.248.92.77                    | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=sendrecv                                | [RFC3264]             |
   | a=rtcp-fb:109 nack                        | [RFC5104]             |
   | a=ice-ufrag:c300d85b                      | [RFC5245]             |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a | [RFC5245]             |
   | 2                                         |                       |
   | a=fingerprint:sha-1                       | [RFC5245]             |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 |                       |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245]             |
   | 192.168.1.7 53214 typ host                |                       |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245]             |
   | 98.248.92.77 53214 typ srflx raddr        |                       |
   | 192.168.1.7 rport 53214                   |                       |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245]             |
   | 192.168.1.7 60065 typ host                |                       |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245]             |
   | 98.248.92.77 60065 typ srflx raddr        |                       |
   | 192.168.1.7 rport 60065                   |                       |
   | m=video 58679 RTP/SAVPF 120               | [RFC4566]             |
   | a=msid:ma tb                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (tb)               |
   | c= IN IP4 98.248.92.77                    | [RFC4566]             |
   | a=rtpmap:120 VP8/90000                    | [draft-ietf-payload-v |
   |                                           | p8]                   |



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   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=sendrecv                                | [RFC3264]             |
   | a=ice-ufrag:85bC300                       | [RFC5245]             |
   | a=ice-pwd:325921d5d47efbabd9a2de4e99bd291 | [RFC5245]             |
   | c                                         |                       |
   | a=fingerprint:sha-1                       | [RFC5245]             |
   | 9d:1f:66:79:a8:07:99:41:49:83:4a:97:0e:1f |                       |
   | :ef:6d:f7:c9:c7:70                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245]             |
   | 192.168.1.7 58679 typ host                |                       |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245]             |
   | 98.248.92.77 58679 typ srflx raddr        |                       |
   | 192.168.1.7 rport 58679                   |                       |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245]             |
   | 192.168.1.7 56607 typ host                |                       |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245]             |
   | 98.248.92.77 56607 typ srflx raddr        |                       |
   | 192.168.1.7 rport 56607                   |                       |
   | a=rtcp-fb:120 nack                        | [RFC5104]             |
   | a=rtcp-fb:120 nack pli                    | [RFC5104]             |
   | a=rtcp-fb:120 ccm fir                     | [RFC5104]             |
   +-------------------------------------------+-----------------------+

                 Table 21: 5.3.4 SDP Answer without BUNDLE

5.4.  MultiResolution, RTX, FEC Examples

   This section deals with scenarios dealing with multiresolution
   negotiation such as layered coding, simulcast, along with techniques
   that deal with providing robustness against transmission errors such
   as FEC and RTX.

5.4.1.  Sendonly Simulcast w/2 cameras and 2 encodings per camera

   This SDP below shows Offer/Answer exchange with an audio and two
   video streams each of which can be sent at two different resolutions.

   One video stream supports VP8, while the other supports H.264.

   bundle-only framework is used along with BUNDLE grouping framework to
   enable multiplexing of all the 5 streams (1 audio stream + 4 video
   streams) over a single RTP Session.







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title 1 Way Successful Simulcast w/BUNDLE

note right of Alice
Alice offers 2 sendonly video streams with 2 simulcast encodings per stream
end note
Alice->Bob: Offer(Audio:Opus,Video1:VP8,Video2:H.264) with bundle-only for video
note left of Bob
Bob accepts Alice's offer and 2 encodings per stream
end note
Alice->Bob: One-Way 1 Opus, 2 H.264 and 2 VP8 video streams, all mulitplexed

   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20519 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE m0 m1 m2              | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m0                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=sendonly                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=ssrc:11111 EocUG1f0fcg             | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |





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   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | m=video 0 RTP/SAVPF 98 100           | bundle-only video line     |
   |                                      | with port number set to    |
   |                                      | zero                       |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m1                             | [RFC5888] Video m=line     |
   |                                      | part of BUNDLE group       |
   | a=rtpmap:98 VP8/90000                | [draft-ietf-payload-vp8]   |
   | a=rtpmap:100 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=imageattr:98 [x=1280,y=720]        | [RFC6236]Camera-1,Encoding |
   |                                      | -1 Resolution              |
   | a=fmtp:98 max-fr=30                  | [RFC4566]                  |
   | a=imageattr:100 [x=640,y=480]        | [RFC6236]                  |
   |                                      | Camera-1,Encoding-2        |
   |                                      | Resolution                 |
   | a=fmtp:100 max-fr=15                 | [RFC4566]                  |
   | a=ssrc-group:SIMULCAST 12345 45678   | [RFC5576]                  |
   | a=ssrc:12345 cname:axzo1278npDlAzM73 | [RFC5576]                  |
   |                                      | [draft-rescorla-avtcore-62 |
   |                                      | 22bis] Camera-1,Encoding-1 |
   |                                      |  SSRC with Session CNAME   |
   | a=ssrc:45678 cname:axzo1278npDlAzM73 | [RFC5576]                  |
   |                                      | [draft-rescorla-avtcore-62 |
   |                                      | 22bis] Camera-1,Encoding-2 |
   |                                      |  SSRC with Session CNAME   |
   | a=sendonly                           | [RFC3264] - Send only      |
   |                                      | video stream               |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   | a=rtcp-fb:98 nack                    | [RFC5104]                  |
   | a=rtcp-fb:98 nack pli                | [RFC5104]                  |



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   | a=rtcp-fb:98 ccm fir                 | [RFC5104]                  |
   | a=rtcp-fb:100 nack                   | [RFC5104]                  |
   | a=rtcp-fb:100 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:100 ccm fir                | [RFC5104]                  |
   | m=video 0 RTP/SAVPF 101 102          | bundle-only video line     |
   |                                      | with port number set to    |
   |                                      | zero                       |
   | a=msid:ma tc                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tc)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m2                             | [RFC5888] Video m=line     |
   |                                      | part of BUNDLE group       |
   | a=rtpmap:101 H264/90000              | [RFC3984]                  |
   | a=rtpmap:102 H264/90000              | [RFC3984]                  |
   | a=fmtp:101                           | [RFC3984]Camera-2,Encoding |
   | profile-level-id=4d0028;packetizatio | -1 Resolution              |
   | n-mode=1;max-fr=30                   |                            |
   | a=fmtp:102                           | [RFC3984]Camera-1,Encoding |
   | profile-level-id=4d0028;packetizatio | -2 Resolution              |
   | n-mode=1;max-fr=15                   |                            |
   | a=ssrc-group:SIMULCAST 67890 56789   | [RFC5576]                  |
   | a=ssrc:67890 cname:axzo1278npDlAzM73 | [RFC5576]                  |
   |                                      | [draft-rescorla-avtcore-62 |
   |                                      | 22bis] Camera-1,Encoding-1 |
   |                                      |  SSRC with Session CNAME   |
   | a=ssrc:56789 cname:axzo1278npDlAzM73 | [RFC5576]                  |
   |                                      | [draft-rescorla-avtcore-62 |
   |                                      | 22bis] Camera-1,Encoding-2 |
   |                                      |  SSRC with Session CNAME   |
   | a=sendonly                           | [RFC3264] - Send only      |
   |                                      | video stream               |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   | a=rtcp-fb:101 nack                   | [RFC5104]                  |
   | a=rtcp-fb:101 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:101 ccm fir                | [RFC5104]                  |
   | a=rtcp-fb:102 nack                   | [RFC5104]                  |
   | a=rtcp-fb:102 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:102 ccm fir                | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                         Table 22: 5.4.1 SDP Offer






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   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20519 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE m0 m1 m2              | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m0                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=sendonly                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:22222                         | [RFC5576]                  |
   | cname:y8/C90alEocUG1f0fcg            |                            |
   | a=ice-ufrag:c300d85b                 | [RFC5245]                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |





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   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | m=video 54609 RTP/SAVPF 98 100       | BUNDLE accepted with port  |
   |                                      | repeated from the audio    |
   |                                      | port                       |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m1                             | [RFC5888] Video m=line     |
   |                                      | part of BUNDLE group       |
   | a=rtpmap:98 VP8/90000                | [draft-ietf-payload-vp8]   |
   | a=rtpmap:100 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=imageattr:98 [x=1280,y=720]        | [RFC6236]Camera-1,Encoding |
   |                                      | -1 Resolution              |
   | a=fmtp:98 max-fr=30                  | [RFC4566]                  |
   | a=imageattr:100 [x=640,y=480]        | [RFC6236]                  |
   |                                      | Camera-1,Encoding-2        |
   |                                      | Resolution                 |
   | a=fmtp:100 max-fr=15                 | [RFC4566]                  |
   | a=recvonly                           | [RFC3264] - receive only   |
   |                                      | video stream               |
   | a=ssrc:54321 cname:axzo1278npDlAzM73 | [RFC5576]                  |
   | a=ice-ufrag:c300d85b                 | [RFC5245]                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5576]                  |
   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |




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   | m=video 54609 RTP/SAVPF 101 102      | BUNDLE accepted with port  |
   |                                      | repeated from the audio    |
   |                                      | port                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=msid:ma tc                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tc)                       |
   | a=mid:m2                             | [RFC5888] Video m=line     |
   |                                      | part of BUNDLE group       |
   | a=rtpmap:101 H264/90000              | [RFC3984]                  |
   | a=rtpmap:102 H264/90000              | [RFC3984]                  |
   | a=recvonly                           | [RFC3264] - Send only      |
   |                                      | video stream               |
   | a=fmtp:101                           | [RFC3984]Camera-2,Encoding |
   | profile-level-id=4d0028;packetizatio | -1 Resolution              |
   | n-mode=1;max-fr=30                   |                            |
   | a=fmtp:102                           | [RFC3984]Camera-1,Encoding |
   | profile-level-id=4d0028;packetizatio | -2 Resolution              |
   | n-mode=1;max-fr=15                   |                            |
   | a=ssrc:90876 cname:axzo1278npDlAzM73 | [RFC5576]                  |
   | a=ice-ufrag:ufrag:c300d85b           | [RFC5245]                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5576]                  |
   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   +--------------------------------------+----------------------------+

                         Table 23: 5.4.1 SDP Anwer





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5.4.2.  Successful SVC Video Stream

   This section shows an SDP Offer/Answer for a session with an audio
   and a single video stream.  The video stream is layered coding at 3
   different resolutions based on [RFC5583].  The video m=line shows 3
   streams with last stream (payload 100) dependent on streams with
   payload 96 and 97 for decoding.

  title SVC Session - 3 Layers w/BUNDLE
  note right of Alice
  Alice offers 3 sendonly video stream with 3 layers of SVC
  end note
  Alice->Bob: Offer(Audio:Opus Video: H.264 SVC) bundle-only
  note left of Bob
  Bob accepts Alice's Offered Codec operation points
  end note
  Bob->Alice: Answer(Video: H.264) bundle-only
  Alice->Bob: One-Way H.264 Video with codec points as indicated by Bob.


   +---------------------------------------+---------------------------+
   | SDP Contents                          | RFC#/Notes                |
   +---------------------------------------+---------------------------+
   | v=0                                   | [RFC4566]                 |
   | o=alice 20519 0 IN IP4 0.0.0.0        | [RFC4566]                 |
   | s=                                    | [RFC4566]                 |
   | t=0 0                                 | [RFC4566]                 |
   | a=group:BUNDLE m0 m1                  | [draft-ietf-mmusic-sdp-bu |
   |                                       | ndle-negotiation] Alice   |
   |                                       |  supports grouping of     |
   |                                       |  m=lines under BUNDLE     |
   |                                       |  semantics                |
   | m=audio 54609 RTP/SAVPF 109           | [RFC4566]                 |
   | a=msid:ma ta                          | Identifies RTCMediaStream |
   |                                       | ID (ma) and               |
   |                                       | RTCMediaStreamTrack ID    |
   |                                       | (ta)                      |
   | c= IN IP4 24.23.204.141               | [RFC4566]                 |
   | a=mid:m0                              | [RFC5888] Audio m=line    |
   |                                       | part of BUNDLE group with |
   |                                       | a unique port number      |
   | a=rtpmap:109 opus/48000/2             | [draft-ietf-payload-rtp-o |
   |                                       | pus]                      |
   | a=ptime:20                            | [draft-ietf-payload-rtp-o |
   |                                       | pus]                      |
   | a=sendonly                            | [RFC3264]                 |
   | a=rtcp-fb:109 nack                    | [RFC5104]                 |




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   | a=setup:actpass                       | [RFC4145] - Alice can     |
   |                                       | perform DTLS before       |
   |                                       | Answer arrives            |
   | a=rtcp-mux                            | [RFC5761]                 |
   | a=ice-ufrag:074c6550                  | [RFC5245]                 |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af | [RFC5245]                 |
   | 08a068                                |                           |
   | a=fingerprint:sha-1                   | [RFC5245]                 |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c |                           |
   | 7:70:9d:1f:66:79:a8:07                |                           |
   | a=candidate:0 1 UDP 2113667327        | [RFC5245]                 |
   | 192.168.1.4 54609 typ host            |                           |
   | a=candidate:1 1 UDP 694302207         | [RFC5245]                 |
   | 24.23.204.141 54609 typ srflx raddr   |                           |
   | 192.168.1.4 rport 54609               |                           |
   | a=candidate:0 2 UDP 2113667326        | [RFC5245]                 |
   | 192.168.1.4 64678 typ host            |                           |
   | a=candidate:1 2 UDP 1694302206        | [RFC5245]                 |
   | 24.23.204.141 64678 typ srflx raddr   |                           |
   | 192.168.1.4 rport 64678               |                           |
   | a=ssrc:67890 cname:axzo1278npDlAzM73  | [RFC5576]                 |
   | m=video 0 RTP/SAVPF 96 97 100         | bundle-only video line    |
   |                                       | with port number set to   |
   |                                       | zero                      |
   | a=msid:ma tb                          | Identifies RTCMediaStream |
   |                                       | ID (ma) and               |
   |                                       | RTCMediaStreamTrack ID    |
   |                                       | (tc)                      |
   | c= IN IP4 24.23.204.141               | [RFC4566]                 |
   | a=mid:m1                              | [RFC5888] Audio m=line    |
   |                                       | part of BUNDLE group      |
   | a=msid:ma tb                          |                           |
   | a=rtpmap:96 H264/90000                | [RFC3984]                 |
   | a=fmtp:96                             | [RFC3984]H.264 Layer 1    |
   | profile-level-id=4d0028;packetization |                           |
   | -mode=1;max-fr=30;max-fs=8040         |                           |
   | a=rtpmap:97 H264/90000                | [RFC3984]                 |
   | a=fmtp:97                             | [RFC3984] H.264 Layer 2   |
   | profile-level-id=4d0028;packetization |                           |
   | -mode=1;max-fr=15;max-fs=1200         |                           |
   | a=rtpmap:100 H264-SVC/90000           | [RFC3984]                 |
   | a=fmtp:100                            | [RFC3984]                 |
   | profile-level-id=4d0028;packetization |                           |
   | -mode=1;max-fr=30;max-fs=8040         |                           |
   | a=depend:100 lay m1:96,97;            | [RFC5583]Layer 3          |
   |                                       | dependent on layers 1 and |
   |                                       | 2                         |




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   | a=sendonly                            | [RFC3264] - Send only     |
   |                                       | video stream              |
   | a=rtcp-mux                            | [RFC5761]                 |
   | a=bundle-only                         | [draft-roach-mmusic-unifi |
   |                                       | ed-plan]                  |
   | a=ssrc:1732846380                     | [RFC5576]                 |
   | cname:axzo1278npDlAzM73               |                           |
   | a=ssrc:1732846381                     | [RFC5576]                 |
   | cname:axzo1278npDlAzM73               |                           |
   | a=ssrc:1732846382                     | [RFC5576]                 |
   | cname:axzo1278npDlAzM73               |                           |
   | a=rtcp-fb:* nack                      | [RFC5104]                 |
   | a=rtcp-fb:* nack pli                  | [RFC5104]                 |
   | a=rtcp-fb:* ccm fir                   | [RFC5104]                 |
   +---------------------------------------+---------------------------+

                    Table 24: 5.4.2 SDP Offer with SVC

   +---------------------------------------+---------------------------+
   | SDP Contents                          | RFC#/Notes                |
   +---------------------------------------+---------------------------+
   | v=0                                   | [RFC4566]                 |
   | o=alice 20519 0 IN IP4 0.0.0.0        | [RFC4566]                 |
   | s=                                    | [RFC4566]                 |
   | t=0 0                                 | [RFC4566]                 |
   | a=group:BUNDLE m0 m1                  | [draft-ietf-mmusic-sdp-bu |
   |                                       | ndle-negotiation] Alice   |
   |                                       |  supports grouping of     |
   |                                       |  m=lines under BUNDLE     |
   |                                       |  semantics                |
   | m=audio 54609 RTP/SAVPF 109           | [RFC4566]                 |
   | a=msid:ma ta                          | Identifies RTCMediaStream |
   |                                       | ID (ma) and               |
   |                                       | RTCMediaStreamTrack ID    |
   |                                       | (ta)                      |
   | c= IN IP4 24.23.204.142               | [RFC4566]                 |
   | a=mid:m0                              | [RFC5888] Audio m=line    |
   |                                       | part of BUNDLE group with |
   |                                       | a unique port number      |
   | a=rtpmap:109 opus/48000/2             | [draft-ietf-payload-rtp-o |
   |                                       | pus]                      |
   | a=ptime:20                            | [draft-ietf-payload-rtp-o |
   |                                       | pus]                      |
   | a=rtcp-fb:109 nack                    | [RFC5104]                 |
   | a=recvonly                            | [RFC3264]                 |
   | a=setup:active                        | [RFC4145] - Bob carries   |
   |                                       | out DTLS Handshake in     |
   |                                       | parallel                  |



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   | a=rtcp-mux                            | [RFC5761]                 |
   | a=ice-ufrag:074c6550                  | [RFC5245]                 |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af | [RFC5245]                 |
   | 08a068                                |                           |
   | a=fingerprint:sha-1                   | [RFC5245]                 |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c |                           |
   | 7:70:9d:1f:66:79:a8:07                |                           |
   | a=candidate:0 1 UDP 2113667327        | [RFC5245]                 |
   | 192.168.1.5 54609 typ host            |                           |
   | a=candidate:1 1 UDP 694302207         | [RFC5245]                 |
   | 24.23.204.142 54609 typ srflx raddr   |                           |
   | 192.168.1.5 rport 54609               |                           |
   | a=candidate:0 2 UDP 2113667326        | [RFC5245]                 |
   | 192.168.1.5 64678 typ host            |                           |
   | a=candidate:1 2 UDP 1694302206        | [RFC5245]                 |
   | 24.23.204.142 64678 typ srflx raddr   |                           |
   | 192.168.1.5 rport 64678               |                           |
   | m=video 54609 RTP/SAVPF 96 100        | BUNDLE accepted Bundle    |
   |                                       | address same as audio     |
   |                                       | m=line.                   |
   | a=msid:ma tb                          | Identifies RTCMediaStream |
   |                                       | ID (ma) and               |
   |                                       | RTCMediaStreamTrack ID    |
   |                                       | (tb)                      |
   | c= IN IP4 24.23.204.142               | [RFC4566]                 |
   | a=mid:m1                              | [RFC5888] Video m=line    |
   |                                       | part of BUNDLE group      |
   | a=rtpmap:96 H264/90000                | [RFC3984]                 |
   | a=fmtp:96                             | [RFC3984]H.264 Layer 1    |
   | profile-level-id=4d0028;packetization |                           |
   | -mode=1;max-fr=30;max-fs=8040         |                           |
   | a=rtpmap:100 H264-SVC/90000           | [RFC3984]                 |
   | a=fmtp:100                            | [RFC3984]                 |
   | profile-level-id=4d0028;packetization |                           |
   | -mode=1;max-fr=30;max-fs=8040         |                           |
   | a=depend:100 lay m1:96;               | [RFC5583] Bob chooses 2   |
   |                                       | Codec Operation points    |
   | a=ice-ufrag:074c6550                  | [RFC5245]                 |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af | [RFC5245]                 |
   | 08a068                                |                           |
   | a=fingerprint:sha-1                   | [RFC5245]                 |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c |                           |
   | 7:70:9d:1f:66:79:a8:07                |                           |
   | a=candidate:0 1 UDP 2113667327        | [RFC5245]                 |
   | 192.168.1.5 54609 typ host            |                           |
   | a=candidate:1 1 UDP 694302207         | [RFC5245]                 |
   | 24.23.204.142 54609 typ srflx raddr   |                           |
   | 192.168.1.5 rport 54609               |                           |



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   | a=candidate:0 2 UDP 2113667326        | [RFC5245]                 |
   | 192.168.1.5 64678 typ host            |                           |
   | a=candidate:1 2 UDP 1694302206        | [RFC5245]                 |
   | 24.23.204.142 64678 typ srflx raddr   |                           |
   | 192.168.1.5 rport 64678               |                           |
   | a=recvonly                            | [RFC3264] - Receive only  |
   |                                       | video stream              |
   | a=setup:active                        | [RFC4145] - Bob carries   |
   |                                       | out DTLS Handshake in     |
   |                                       | parallel                  |
   | a=rtcp-mux                            | [RFC5761]                 |
   | a=bundle-only                         | [draft-roach-mmusic-unifi |
   |                                       | ed-plan]                  |
   | a=ssrc:4638117328                     | [RFC5576]                 |
   | cname:axzo1278npDlAzM73               |                           |
   +---------------------------------------+---------------------------+

                    Table 25: 5.4.2 SDP Answer with SVC

5.4.3.  Successful Simulcast Video Streams with Retransmisson

   This section shows an SDP Offer/Answer exchange for a simulcast
   scenario with 2 two resolutions and has [RFC4588] style re-
   transmission flows.

title Simulcast Streams with Retransmission

note right of Alice
Alice offers single audio and simulcasted video stream
end note
Alice->Bob: Offer(Audio:Opus Video:VP8 with 2 resolutions and RTX Stream) bundle-only
note left of Bob
Bob accepts all the streams offered by Alice
end note

Bob->Alice: Answer(Audio:Opus Video:VP8 with 2 resolutions and RTX Stream) bundle-only

Alice<->Bob: 2 Way Audio and Simulcast Video with RTX Streams

   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20519 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |





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   | a=group:BUNDLE m0 m1                 | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m0                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:11111 cname:EocUG1f0fcg/yvY7  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | m=video 0 RTP/SAVPF 98 100 101 103   | bundle-only video line     |
   |                                      | with port number set to    |
   |                                      | zero                       |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |



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   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m1                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group       |
   | b=AS:1756                            | [RFC4566]                  |
   | a=rtpmap:98 VP8/90000                | [draft-ietf-payload-vp8]   |
   | a=rtpmap:100 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=rtpmap:101 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=rtpmap:103 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=fmtp:98 max-fr=30;max-fs=8040      | [RFC4566]                  |
   | a=fmtp:100 max-fr=15;max-fs=1200     | [RFC4566]                  |
   | a=fmtp:101 apt=98;rtx-time=3000      | [RFC4588]                  |
   | a=fmtp:103 apt=100;rtx-time=3000     | [RFC4588]                  |
   | a=ssrc-group:SIMULCAST 12345 78990   | Simulcast group            |
   | a=ssrc-group:FID 12345 34567         | [RFC5888]                  |
   | a=ssrc-group:FID 78990 90887         | [RFC5888]                  |
   | a=ssrc:12345 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ssrc:78990 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ssrc:34567 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ssrc:90887 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=sendrecv                           | [RFC3264]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   | a=rtcp-fb:* nack                     | [RFC5104]                  |
   | a=rtcp-fb:* nack pli                 | [RFC5104]                  |
   | a=rtcp-fb:* ccm fir                  | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                Table 26: 5.4.3 SDP Offer w/Simulcast, RTX

   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20519 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE m0 m1                 | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | c= IN IP4 24.23.204.142              | [RFC4566]                  |



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   | a=mid:m0                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:33333 cname:L/HmN4Xa5NWs1ao1  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.5 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.142 54609 typ srflx raddr  |                            |
   | 192.168.1.5 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.5 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.142 64678 typ srflx raddr  |                            |
   | 192.168.1.5 rport 64678              |                            |
   | m=video 54609 RTP/SAVPF 98 100 101   | BUNDLE accepted with       |
   | 103                                  | Bundle address identical   |
   |                                      | to audio m-line            |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | c= IN IP4 24.23.204.142              | [RFC4566]                  |
   | a=mid:m1                             | [RFC5888] Video m=line     |
   |                                      | part of BUNDLE group       |
   | a=rtpmap:98 VP8/90000                | [draft-ietf-payload-vp8]   |
   | a=rtpmap:100 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=rtpmap:101 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=rtpmap:103 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=fmtp:98 max-fr=30;max-fs=8040      | [RFC4566]                  |
   | a=fmtp:100 max-fr=15;max-fs=1200     | [RFC4566]                  |
   | a=fmtp:101 apt=98;rtx-time=3000      | [RFC4588]                  |
   | a=fmtp:103 apt=100;rtx-time=3000     | [RFC4588]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |




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   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.5 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.142 54609 typ srflx raddr  |                            |
   | 192.168.1.5 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.5 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.142 64678 typ srflx raddr  |                            |
   | 192.168.1.5 rport 64678              |                            |
   | a=ssrc-group:SIMULCAST 54321 77656   | Simulcast group            |
   | a=ssrc-group:FID 54321 88776         | [RFC5888]                  |
   | a=ssrc-group:FID 77656 12908         | [RFC5888]                  |
   | a=ssrc:54321 cname:LP/NWs1ao1HmN4Xa5 | [RFC5576]                  |
   | a=ssrc:77656 cname:LP/NWs1ao1HmN4Xa5 | [RFC5576]                  |
   | a=ssrc:88776 cname:LP/NWs1ao1HmN4Xa5 | [RFC5576]                  |
   | a=ssrc:12908 cname:LP/NWs1ao1HmN4Xa5 | [RFC5576]                  |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   | a=rtcp-fb:* nack                     | [RFC5104]                  |
   | a=rtcp-fb:* nack pli                 | [RFC5104]                  |
   | a=rtcp-fb:* ccm fir                  | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                Table 27: 5.4.3 SDP Answer w/Simulcast, RTX

5.4.4.  Successful 1-way Simulcast with 2 resolutions and RTX - One
        resolution rejected

   This section shows an SDP Offer/Answer exchange for a simulcast
   scenario with 2 two resolutions and has [RFC4588] style re-
   transmission flows.

   It also showcases when Bob rejects one of the Simulcast Video Stream
   which results in the rejection of the associated repair stream
   implicitly





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title Simulcast Streams with Retransmission Rejected

note right of Alice
Alice offers sendonly single audio and simulcasted video stream.
end note
Alice->Bob: Offer(Audio:Opus Video:VP8 with 2 resolutions and RTX Streams) bundle-only

note left of Bob
Bob accepts one simulcast,rtx and rejects the other
end note
Bob->Alice: Answer(Audio:Opus Video:VP8 with 1 resolution and the RTX Stream) bundle-only

Alice->Bob: 1 Way Audio, Video Session
note right of Alice
Only 1 Video stream and its associated RTX stream
is sent to Bob
end note


   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20519 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE m0 m1                 | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m0                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=sendonly                           | [RFC3264]                  |





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   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:11111 cname:LP/NWs1ao1HmN4Xa5 | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | m=video 0 RTP/SAVPF 98 100 101 103   | bundle-only video line     |
   |                                      | with port number set to    |
   |                                      | zero                       |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m1                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group       |
   | a=rtpmap:98 VP8/90000                | [draft-ietf-payload-vp8]   |
   | a=rtpmap:100 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=rtpmap:101 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=rtpmap:103 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=fmtp:98 max-fr=30;max-fs=8040      | [RFC4566]                  |
   | a=fmtp:100 max-fr=15;max-fs=1200     | [RFC4566]                  |
   | a=fmtp:101 apt=98;rtx-time=3000      | [RFC4588]                  |
   | a=fmtp:103 apt=100;rtx-time=3000     | [RFC4588]                  |
   | a=ssrc-group:SIMULCAST 12345 78990   | Simulcast group            |
   | a=ssrc-group:FID 12345 34567         | [RFC5888]                  |
   | a=ssrc-group:FID 78990 90887         | [RFC5888]                  |
   | a=ssrc:12345 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ssrc:78990 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ssrc:34567 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ssrc:90887 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=sendonly                           | [RFC3264]                  |
   | a=rtcp-mux                           | [RFC5761]                  |



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   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   | a=rtcp-fb:* nack                     | [RFC5104]                  |
   | a=rtcp-fb:* nack pli                 | [RFC5104]                  |
   | a=rtcp-fb:* ccm fir                  | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                Table 28: 5.4.4 SDP Offer w/Simulcast, RTX











































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   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20519 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE m0 m1                 | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | c= IN IP4 24.23.204.142              | [RFC4566]                  |
   | a=mid:m0                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=recvonly                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.5 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.142 54609 typ srflx raddr  |                            |
   | 192.168.1.5 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.5 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.142 64678 typ srflx raddr  |                            |
   | 192.168.1.5 rport 64678              |                            |





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   | m=video 54609 RTP/SAVPF 98 101       | BUNDLE accepted with       |
   |                                      | Bundle address identical   |
   |                                      | to audio m-line            |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | c= IN IP4 24.23.204.142              | [RFC4566]                  |
   | a=mid:m1                             | [RFC5888] Video m=line     |
   |                                      | part of BUNDLE group       |
   | a=rtpmap:98 VP8/90000                | [draft-ietf-payload-vp8]   |
   | a=rtpmap:101 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=fmtp:98 max-fr=30;max-fs=8040      | [RFC4566]                  |
   | a=fmtp:101 apt=98;rtx-time=3000      | [RFC4588]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.5 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.142 54609 typ srflx raddr  |                            |
   | 192.168.1.5 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.5 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.142 64678 typ srflx raddr  |                            |
   | 192.168.1.5 rport 64678              |                            |
   | a=ssrc:54321 cname:NWs1ao1HmN4Xa5    | [RFC5576]                  |
   | a=recvonly                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   +--------------------------------------+----------------------------+

                  Table 29: 5.4.4 SDP Answer no Simulcast

5.4.5.  Simulcast Video Stream with Forward Error Correction

   This section shows an SDP Offer/Answer exchange for Simulcast video
   stream at two resolutions and and has [RFC5956] style FEC flows.

   On completion of Offer/Answer exchange, one audio stream, 2 simulcast



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   video streams and 2 associated FEC streams are sent over a single
   5-Tuple as part of bundle-only and BUNDLE framework.

title Simulcast Streams with Forward Error Correction

note right of Alice
Alice offers sendonly single audio and simulcasted video stream
end note
Alice->Bob: Offer(Audio:Opus Video:VP8 with 2 resolutions with FEC Streams) bundle-only

note left of Bob
Bob accepts simulcast stream as well as FEC streams
end note
Bob->Alice: Answer(Audio:Opus Video:VP8 with 2 resolutions with FEC Streams) bundle-only

Alice->Bob: 1 Way Audio, Video Session
note right of Alice
Successful Session with 4 video streams (Simulcast + FEC) and 1 Audio Stream

   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20519 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE m0 m1                 | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m0                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=sendrecv                           | [RFC3264]                  |





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   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:11111 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | m=video 0 RTP/SAVPF 98 100 101 103   | bundle-only video line     |
   |                                      | with port number set to    |
   |                                      | zero                       |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m1                             | [RFC5888] Video m=line     |
   |                                      | part of BUNDLE group       |
   | a=rtpmap:98 VP8/90000                | [draft-ietf-payload-vp8]   |
   | a=rtpmap:100 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=rtpmap:101                         | [RFC5956]                  |
   | 1d-interleaved-parityfec/90000       |                            |
   | a=rtpmap:103                         | [RFC5956]                  |
   | 1d-interleaved-parityfec/90000       |                            |
   | a=fmtp:98 max-fr=30;max-fs=8040      | [RFC4566]                  |
   | a=fmtp:100 max-fr=15;max-fs=1200     | [RFC4566]                  |
   | a=fmtp:101 L=5; D=10;                | [RFC5956]                  |
   | repair-window=200000                 |                            |
   | a=fmtp:103 L=5; D=10;                | [RFC5956]                  |
   | repair-window=200000                 |                            |
   | a=ssrc-group:SIMULCAST 12345 78990   | Simulcast group            |
   | a=ssrc-group:FEC-FR 12345 34567      | [RFC5888]                  |
   | a=ssrc-group:FEC-FR 78990 90887      | [RFC5888]                  |
   | a=ssrc:12345 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ssrc:78990 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |



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   | a=ssrc:34567 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ssrc:90887 cname:Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=sendrecv                           | [RFC3264]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   | a=rtcp-fb:* nack                     | [RFC5104]                  |
   | a=rtcp-fb:* nack pli                 | [RFC5104]                  |
   | a=rtcp-fb:* ccm fir                  | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                         Table 30: 5.4.5 SDP Offer

   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20519 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE m0 m1                 | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m0                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:33333 cname:Y9/cZke09JAtpl98  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |



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   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | m=video 54609 RTP/SAVPF 98 100 101   | BUNDLE accepted with       |
   | 103                                  | Bundle Address identical   |
   |                                      | to audio m=line.           |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m1                             | [RFC5888] Video m=line     |
   |                                      | part of BUNDLE group       |
   | a=rtpmap:98 VP8/90000                | [draft-ietf-payload-vp8]   |
   | a=rtpmap:100 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=rtpmap:101                         | [RFC5956]                  |
   | 1d-interleaved-parityfec/90000       |                            |
   | a=rtpmap:103                         | [RFC5956]                  |
   | 1d-interleaved-parityfec/90000       |                            |
   | a=fmtp:98 max-fr=30;max-fs=8040      | [RFC4566]                  |
   | a=fmtp:100 max-fr=15;max-fs=1200     | [RFC4566]                  |
   | a=fmtp:101 L=5; D=10;                | [RFC5956]                  |
   | repair-window=200000                 |                            |
   | a=fmtp:103 L=5; D=10;                | [RFC5956]                  |
   | repair-window=200000                 |                            |
   | a=ssrc-group:SIMULCAST 54321 77656   | Simulcast group            |
   | a=ssrc-group:FEC-FR 54321 88776      | [RFC5888]                  |
   | a=ssrc-group:FEC-FR 77656 12908      | [RFC5888]                  |
   | a=ssrc:54321 cname:Q/1HmN4Xa5CClapa  | [RFC5576]                  |
   | a=ssrc:77656 cname:Q/1HmN4Xa5CClapa  | [RFC5576]                  |
   | a=ssrc:88776 cname:Q/1HmN4Xa5CClapa  | [RFC5576]                  |
   | a=ssrc:12908 cname:Q/1HmN4Xa5CClapa  | [RFC5576]                  |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5761]                  |




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   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=rtcp-fb:* nack                     | [RFC5104]                  |
   | a=rtcp-fb:* nack pli                 | [RFC5104]                  |
   | a=rtcp-fb:* ccm fir                  | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                        Table 31: 5.4.5 SDP Answer

5.5.  Others

   The examples in the section provide SDP for a variety of scenarios
   related to RTCP configuration, RTP Header extension, Legacy Interop
   scenarios and more.

5.5.1.  Video Session with Reduced-Size RTCP Support

   Alice wants to setup a secure RTCP feedback based video session with
   Bob, but also wants to negotiate support for Reduced Size RTCP as
   defined in RFC5506.  Since Bob is capable of this feature, the
   includes a=rtcp-rsize in the Answer.














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title Video Session with Reduced Size RTCP Support
Alice->Bob: Offer(Video:H.264,VP8)
note right of Alice
Alice prefers reduced size RTCP Packets
end note
Bob->Alice: Answer(Video:H.264)
note left of Bob
Bob supports reduced-size RTCP packets and he prefers the same from Alice.
end note
Alice<->Bob: Two-way H.264 Video
note right of Alice
  RTCP packets are generated per RFC5506
end note

   +---------------------------------------------+---------------------+
   | SDP Contents                                | RFC#/Notes          |
   +---------------------------------------------+---------------------+
   | v=0                                         | [RFC4566]           |
   | o=alice 20518 0 IN IP4 0.0.0.0              | [RFC4566] - Session |
   |                                             | Origin Information  |
   | s=                                          | [RFC4566]           |
   | t=0 0                                       | [RFC4566]           |
   | m=video 62537 RTP/SAVPF 99 120              | [RFC4566]           |
   | a=msid:ma tb                                | Identifies          |
   |                                             | RTCMediaStream ID   |
   |                                             | (ma) and            |
   |                                             | RTCMediaStreamTrack |
   |                                             | ID (tb)             |
   | c= IN IP4 24.23.204.141                     | [RFC4566]           |
   | a=rtpmap:99 H264/90000                      | [RFC3984] - H.264   |
   |                                             | Video Codec         |
   | a=fmtp:99                                   | [RFC3984]           |
   | profile-level-id=4d0028;packetization-mode= |                     |
   | 1                                           |                     |
   | a=rtpmap:120 VP8/90000                      | [draft-ietf-payload |
   |                                             | -vp8] - VP8 video   |
   |                                             |  codec              |
   | a=rtcp-rsize                                | [RFC5506] - Alice   |
   |                                             | intends to use      |
   |                                             | reduced size RTCP   |
   |                                             | for this session    |
   | a=sendrecv                                  | [RFC3264]           |
   | a=setup:actpass                             | [RFC4145]           |
   | a=rtcp-mux                                  | [RFC5761]           |
   | a=ice-ufrag:074c6550                        | [RFC5245]           |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a068 | [RFC5245]           |





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   | a=fingerprint:sha-1                         | [RFC5245]           |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70:9 |                     |
   | d:1f:66:79:a8:07                            |                     |
   | a=candidate:0 1 UDP 2113667327 192.168.1.4  | [RFC5245]           |
   | 62537 typ host                              |                     |
   | a=candidate:1 1 UDP 1694302207              | [RFC5245]           |
   | 24.23.204.141 62537 typ srflx raddr         |                     |
   | 192.168.1.4 rport 62537                     |                     |
   | a=candidate:0 2 2113667326 192.168.1.4      | [RFC5245]           |
   | 54721 typ host                              |                     |
   | a=candidate:1 2 UDP 1694302206              | [RFC5245]           |
   | 24.23.204.141 54721 typ srflx raddr         |                     |
   | 192.168.1.4 rport 54721                     |                     |
   | a=rtcp-fb:99 nack                           | [RFC5245]           |
   | a=rtcp-fb:99 nack pli                       | [RFC5104]           |
   | a=rtcp-fb:99 ccm fir                        | [RFC5104]           |
   | a=rtcp-fb:120 nack                          | [RFC5104]           |
   | a=rtcp-fb:120 nack pli                      | [RFC5104]           |
   | a=rtcp-fb:120 ccm fir                       | [RFC5104]           |
   | a=ssrc:12908 cname:Q/1HmN4Xa5CClapa         | [RFC5576]           |
   +---------------------------------------------+---------------------+

                         Table 32: 5.5.1 SDP Offer




























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   +------------------------------------------------+------------------+
   | SDP Contents                                   | RFC#/Notes       |
   +------------------------------------------------+------------------+
   | v=0                                            | [RFC4566]        |
   | o=bob 16833 0 IN IP4 0.0.0.0                   | [RFC4566]        |
   | s=                                             | [RFC4566]        |
   | t=0 0                                          | [RFC4566]        |
   | m=video 63130 RTP/SAVPF 99                     | [RFC4566]        |
   | a=msid:ma tb                                   | Identifies       |
   |                                                | RTCMediaStream   |
   |                                                | ID (ma) and      |
   |                                                | RTCMediaStreamTr |
   |                                                | ack ID (tb)      |
   | c= IN IP4 98.248.92.771                        | [RFC4566]        |
   | a=rtpmap:99 H264/90000                         | [RFC3984]        |
   | a=fmtp:99                                      | [RFC3984]        |
   | profile-level-id=4d0028;packetization-mode=1   |                  |
   | a=rtcp-rsize                                   | [RFC5506] - Bob  |
   |                                                | supports reduced |
   |                                                | size RTCP        |
   | a=sendrecv                                     | [RFC3264]        |
   | a=setup:active                                 | [RFC4145]        |
   | a=rtcp-mux                                     | [RFC5761]        |
   | a=ice-ufrag:c300d85b                           | [RFC5245]        |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a2     | [RFC5245]        |
   | a=fingerprint:sha-1                            | [RFC5245]        |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d:1 |                  |
   | f:66:79:a8:07                                  |                  |
   | a=candidate:0 1 UDP 2113667327 192.168.1.7     | [RFC5245]        |
   | 63130 typ host                                 |                  |
   | a=candidate:1 1 UDP 1694302207 98.248.92.77    | [RFC5245]        |
   | 63130 typ srflx raddr 192.168.1.7 rport 63130  |                  |
   | a=candidate:0 2 UDP 2113667326 192.168.1.7     | [RFC5245]        |
   | 56607 typ host                                 |                  |
   | a=candidate:1 2 UDP 1694302206 98.248.92.77    | [RFC5245]        |
   | 56607 typ srflx raddr 192.168.1.7 rport 56607  |                  |
   | a=rtcp-fb:99 nack pli                          | [RFC5104]        |
   | a=rtcp-fb:99 ccm fir                           | [RFC5104]        |
   | a=ssrc:11111 cname:QCL/1HmN4Xa5CClapa          | [RFC5576]        |
   +------------------------------------------------+------------------+

                        Table 33: 5.5.1 SDP Answer

5.5.2.  Audio Session Voice Activity Detection

   This example shows Alice indicating the support of the RTP header
   extension to include the audio-level of the audio sample carried in
   the RTP packet.



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   title 2-Way Audio with VAD

   Alice->Bob: Offer(Audio:Opus,PCMU,PCMA)
   note right of Alice
   Alice indicates support for including audio-level
   end note
   Bob->Alice: Answer(Audio:Opus,PCMU,PCMA)
   note left of Bob
   Bob accepts and indicates his support as well
   end note
   Alice<->Bob: Two-way Opus Audio
   note right of Alice
    Per packet audio-level is included
   end note

   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=alice 20518 0 IN IP4 0.0.0.0            | [RFC4566]             |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 54609 RTP/SAVPF 109 0 8           | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=extmap:1                                | [RFC6464]             |
   | urn:ietf:params:rtp-hdrext:ssrc-audio-lev |                       |
   | el                                        |                       |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=rtpmap:0 PCMU/8000                      | [RFC3551]             |
   | a=rtpmap:0 PCMA/8000                      | [RFC3551]             |
   | a=sendrecv                                | [RFC3264]             |
   | a=setup:actpass                           | [RFC4145]             |
   | a=rtcp-mux                                | [RFC5761]             |
   | a=ice-ufrag:074c6550                      | [RFC5245]             |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a0 | [RFC5245]             |
   | 68                                        |                       |
   | a=fingerprint:sha-1                       | [RFC5245]             |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 |                       |
   | :9d:1f:66:79:a8:07                        |                       |




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   | a=candidate:0 1 UDP 2113667327            | [RFC5245]             |
   | 192.168.1.4 54609 typ host                |                       |
   | a=candidate:1 1 UDP 694302207             | [RFC5245]             |
   | 24.23.204.141 54609 typ srflx raddr       |                       |
   | 192.168.1.4 rport 54609                   |                       |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245]             |
   | 192.168.1.4 64678 typ host                |                       |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245]             |
   | 24.23.204.141 64678 typ srflx raddr       |                       |
   | 192.168.1.4 rport 64678                   |                       |
   | a=rtcp-fb:* nack                          | [RFC5104]             |
   | a=ssrc:11111 cname:QCL/1HmN4Xa5CClapa     | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                         Table 34: 5.5.2 SDP Offer

   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=bob 16833 0 IN IP4 0.0.0.0              | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 49203 RTP/SAVPF 109 0 98          | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 98.248.92.77                    | [RFC4566]             |
   | a=extmap:1                                | [RFC6464]             |
   | urn:ietf:params:rtp-hdrext:ssrc-audio-lev |                       |
   | el                                        |                       |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] - Bob accept |
   |                                           | sonly Opus Codec      |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=rtpmap:0 PCMU/8000                      | [RFC3551] PCMU Audio  |
   |                                           | Codec                 |
   | a=rtpmap:0 PCMA/8000                      | [RFC3551] PCMA Audio  |
   |                                           | Codec                 |
   | a=rtcp-fb:* nack                          | [RFC5104]             |
   | a=sendrecv                                | [RFC3264] - Bob can   |
   |                                           | send and recv audio   |





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   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=rtcp-mux                                | [RFC5761] - Bob can   |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 49203  |
   | a=ice-ufrag:c300d85b                      | [RFC5245] - Session   |
   |                                           | Level ICE username    |
   |                                           | frag                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a | [RFC5245] - Session   |
   | 2                                         | Level ICE password    |
   | a=fingerprint:sha-1                       | [RFC5245] - Session   |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | DTLS Fingerprint for  |
   | :9d:1f:66:79:a8:07                        | SRTP                  |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.7 49203 typ host                | Candidate for Opus    |
   |                                           | Stream                |
   | a=candidate:1 1 UDP 1694302207            | [RFC5245] - Server    |
   | 98.248.92.77 49203 typ srflx raddr        | Reflexive ICE         |
   | 192.168.1.7 rport 49203                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.7 60065 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 98.248.92.77 60065 typ srflx raddr        | Reflexive Candidate   |
   | 192.168.1.7 rport 60065                   | for the Second Host   |
   |                                           | Candidate             |
   | a=ssrc:1732846380 cname:EocUG1f0fcg/yvY7  | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                        Table 35: 5.5.2 SDP Answer

5.5.3.  Audio Conference - Voice Activity Detection

   This example shows SDP for RTP header extension that allows RTP-level
   mixers in audio conferences to deliver information about the audio
   level of individual participants.














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   title 2-Way Audio with VAD

   Alice->Bob: Offer(Audio:Opus,PCMU,PCMA)
   note right of Alice
   Alice indicates support for including audio-level
   end note
   Bob->Alice: Answer(Audio:Opus,PCMU,PCMA)
   note left of Bob
   Bob accepts and indicates his support as well
   end note
   Alice<->Bob: Two-way Opus Audio
   note right of Alice
    Per packet audio-level is included
   end note

   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=alice 20518 0 IN IP4 0.0.0.0            | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | a=rtcp-rsize                              | [RFC5506] - Alice     |
   |                                           | intends to use        |
   |                                           | reduced size RTCP for |
   |                                           | this session          |
   | m=audio 54609 RTP/SAVPF 109 0 8           | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=extmap:1/recvonly                       | [RFC6465]             |
   | urn:ietf:params:rtp-hdrext:csrc-audio-lev |                       |
   | el                                        |                       |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] - Opus Codec |
   |                                           |  48khz, 2 channels    |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus] - Opus       |
   |                                           |  packetization of 20m |
   |                                           | s                     |
   | a=rtpmap:0 PCMU/8000                      | [RFC3551] PCMU Audio  |
   |                                           | Codec                 |
   | a=rtpmap:0 PCMA/8000                      | [RFC3551] PCMA Audio  |
   |                                           | Codec                 |



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   | a=rtcp-fb:* nack                          | [RFC5104]             |
   | a=sendrecv                                | [RFC3264] - Alice can |
   |                                           | send and recv audio   |
   | a=setup:actpass                           | [RFC4145] - Alice can |
   |                                           | perform DTLS before   |
   |                                           | Answer arrives        |
   | a=rtcp-mux                                | [RFC5761] - Alice can |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 54609  |
   | a=ice-ufrag:074c6550                      | [RFC5245] - Session   |
   |                                           | Level ICE parameter   |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a0 | [RFC5245] - Session   |
   | 68                                        | Level ICE parameter   |
   | a=fingerprint:sha-1                       | [RFC5245] - Session   |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | DTLS Fingerprint for  |
   | :9d:1f:66:79:a8:07                        | SRTP                  |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.4 54609 typ host                | Candidate             |
   | a=candidate:1 1 UDP 694302207             | [RFC5245] - Server    |
   | 24.23.204.141 54609 typ srflx raddr       | Reflexive ICE         |
   | 192.168.1.4 rport 54609                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.4 64678 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 24.23.204.141 64678 typ srflx raddr       | Reflexive Candidate   |
   | 192.168.1.4 rport 64678                   | for the Second Host   |
   |                                           | Candidate             |
   | a=ssrc:11111 cname:QCL/1HmN4Xa5CClapa     | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                         Table 36: 5.5.3 SDP Offer



















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   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=bob 16833 0 IN IP4 0.0.0.0              | [RFC4566] - Session   |
   |                                           | Origin Information    |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 49203 RTP/SAVPF 109 0 98          | [RFC4566]             |
   | a=msid:ma ta                              | Identifies            |
   |                                           | RTCMediaStream ID     |
   |                                           | (ma) and              |
   |                                           | RTCMediaStreamTrack   |
   |                                           | ID (ta)               |
   | c= IN IP4 98.248.92.77                    | [RFC4566]             |
   | a=extmap:1/sendonly                       | [RFC6465]             |
   | urn:ietf:params:rtp-hdrext:csrc-audio-lev |                       |
   | el                                        |                       |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus] - Bob accept |
   |                                           | sonly Opus Codec      |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=rtpmap:0 PCMU/8000                      | [RFC3551] PCMU Audio  |
   |                                           | Codec                 |
   | a=rtpmap:0 PCMA/8000                      | [RFC3551] PCMA Audio  |
   |                                           | Codec                 |
   | a=rtcp-fb:* nack                          | [RFC5104]             |
   | a=sendrecv                                | [RFC3264] - Bob can   |
   |                                           | send and recv audio   |
   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=rtcp-mux                                | [RFC5761] - Bob can   |
   |                                           | perform RTP/RTCP      |
   |                                           | Muxing on port 49203  |
   | a=ice-ufrag:c300d85b                      | [RFC5245] - Session   |
   |                                           | Level ICE username    |
   |                                           | frag                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a | [RFC5245] - Session   |
   | 2                                         | Level ICE password    |
   | a=fingerprint:sha-1                       | [RFC5245] - Session   |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | DTLS Fingerprint for  |
   | :9d:1f:66:79:a8:07                        | SRTP                  |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245] - Host ICE  |
   | 192.168.1.7 49203 typ host                | Candidate for Opus    |
   |                                           | Stream                |




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   | a=candidate:1 1 UDP 1694302207            | [RFC5245] - Server    |
   | 98.248.92.77 49203 typ srflx raddr        | Reflexive ICE         |
   | 192.168.1.7 rport 49203                   | Candidate for the     |
   |                                           | above host candidate  |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245] - Second    |
   | 192.168.1.7 60065 typ host                | Host Candidate        |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245] - Server    |
   | 98.248.92.77 60065 typ srflx raddr        | Reflexive Candidate   |
   | 192.168.1.7 rport 60065                   | for the Second Host   |
   |                                           | Candidate             |
   | a=ssrc:2222 cname:HmN4Xa5CC/lapa          | [RFC5576]             |
   +-------------------------------------------+-----------------------+

                        Table 37: 5.5.3 SDP Answer

5.5.4.  Successful legacy Interop Fallaback with bundle-only

   In the scenario described below, Alice is a multi-stream capable
   WebRTC endpoint while Bob is a legacy VOIP end-point.  The SDP Offer/
   Answer exchange demonstrates successful session setup with fallback
   to audio only stream negotiated via bundle-only framework between the
   end-points.  Specifically,
   o  Offer from Alice describes 2 cameras via 2 video m=lines with both
      marked as bundle-only.
   o  Since Bob doesnot recognize either BUNDLE mechanism or bundle-only
      attribute, he accepts only the audio stream from Alice.

title Successful 2-Way WebRTC <-> VOIP Interop

note right of Alice
Alice is a multistream capable WebRTC end-point & Bob is behind a legacy VOIP system
end note
Alice->Bob: Offer(Audio:Opus Video: 2 VP8, 2 H2.64 Streams) with bundle-only offer
note right of Alice
Alice marks both the video streams as bundle-only
end note
Bob->Alice: Answer(Audio:Opus)
note left of Bob
 Bob accepts only Audio stream since he doesn't recognize
 bundle-only streams
end note
Alice<->Bob: Two-way Opus Audio

   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20519 0 IN IP4 0.0.0.0       | [RFC4566]                  |



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   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE m0 m1 m2              | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics                 |
   | m=audio 54609 RTP/SAVPF 109          | [RFC4566]                  |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m0                             | [RFC5888] Audio m=line     |
   |                                      | part of BUNDLE group with  |
   |                                      | a unique port number       |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=sendonly                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 54609 typ host           |                            |
   | a=candidate:1 1 UDP 694302207        | [RFC5245]                  |
   | 24.23.204.141 54609 typ srflx raddr  |                            |
   | 192.168.1.4 rport 54609              |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=candidate:1 2 UDP 1694302206       | [RFC5245]                  |
   | 24.23.204.141 64678 typ srflx raddr  |                            |
   | 192.168.1.4 rport 64678              |                            |
   | a=ssrc:11111 cname:axzo1278npDlAzM73 | [RFC5576]E                 |
   | m=video 0 RTP/SAVPF 98 100           | bundle-only video line     |
   |                                      | with port number set to    |
   |                                      | zero                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |




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   | a=mid:m1                             | [RFC5888] Video m=line     |
   |                                      | part of BUNDLE group       |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |
   | a=rtpmap:98 VP8/90000                | [draft-ietf-payload-vp8]   |
   | a=rtpmap:100 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=imageattr:98 [x=1280,y=720]        | [RFC6236]Camera-1,Encoding |
   |                                      | -1 Resolution              |
   | a=fmtp:98 max-fr=30                  | [RFC4566]                  |
   | a=imageattr:100 [x=640,y=480]        | [RFC6236]                  |
   |                                      | Camera-1,Encoding-2        |
   |                                      | Resolution                 |
   | a=fmtp:100 max-fr=15                 | [RFC4566]                  |
   | a=ssrc-group:SIMULCAST 12345 45678   | [RFC5576]                  |
   | a=ssrc:12345 cname:axzo1278npDlAzM73 | [RFC5576]E                 |
   | a=ssrc:45678 cname:axzo1278npDlAzM73 | [RFC5576]                  |
   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   | m=video 0 RTP/SAVPF 101 103          | bundle-only video line     |
   |                                      | with port number set to    |
   |                                      | zero                       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=mid:m2                             | [RFC5888] Video m=line     |
   |                                      | part of BUNDLE group       |
   | a=msid:ma tc                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tc)                       |
   | a=rtpmap:101 H264/90000              | [RFC3984]                  |
   | a=rtpmap:103 H264/90000              | [RFC3984]                  |
   | a=fmtp:101                           | [RFC3984]Camera-2,Encoding |
   | profile-level-id=4d0028;packetizatio | -1 Resolution              |
   | n-mode=1;max-fr=30                   |                            |
   | a=fmtp:100                           | [RFC3984]Camera-1,Encoding |
   | profile-level-id=4d0028;packetizatio | -2 Resolution              |
   | n-mode=1;max-fr=15                   |                            |
   | a=ssrc-group:SIMULCAST 67890 56789   | [RFC5576]                  |
   | a=ssrc:67890 cname:axzo1278npDlAzM73 | [RFC5576]                  |
   | a=ssrc:56789 cname:axzo1278npDlAzM73 | [RFC5576]                  |
   | a=bundle-only                        | [draft-roach-mmusic-unifie |
   |                                      | d-plan]                    |
   +--------------------------------------+----------------------------+

                 Table 38: 5.5.4 SDP Simulcast bundle-only





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   +-------------------------------------------+-----------------------+
   | SDP Contents                              | RFC#/Notes            |
   +-------------------------------------------+-----------------------+
   | v=0                                       | [RFC4566]             |
   | o=alice 20519 0 IN IP4 0.0.0.0            | [RFC4566]             |
   | s=                                        | [RFC4566]             |
   | t=0 0                                     | [RFC4566]             |
   | m=audio 54609 RTP/SAVPF 109               | [RFC4566]             |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:109 opus/48000/2                 | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=ptime:20                                | [draft-ietf-payload-r |
   |                                           | tp-opus]              |
   | a=rtcp-fb:109 nack                        | [RFC5104]             |
   | a=sendonly                                | [RFC3264]             |
   | a=setup:active                            | [RFC4145] - Bob       |
   |                                           | carries out DTLS      |
   |                                           | Handshake in parallel |
   | a=ice-ufrag:ufrag:c300d85b                | [RFC5245]             |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a | [RFC5245]             |
   | 2                                         |                       |
   | a=fingerprint:sha-1                       | [RFC5245]             |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 |                       |
   | :9d:1f:66:79:a8:07                        |                       |
   | a=candidate:0 1 UDP 2113667327            | [RFC5245]             |
   | 192.168.1.4 54609 typ host                |                       |
   | a=candidate:1 1 UDP 694302207             | [RFC5245]             |
   | 24.23.204.141 54609 typ srflx raddr       |                       |
   | 192.168.1.4 rport 54609                   |                       |
   | a=candidate:0 2 UDP 2113667326            | [RFC5245]             |
   | 192.168.1.4 64678 typ host                |                       |
   | a=candidate:1 2 UDP 1694302206            | [RFC5245]             |
   | 24.23.204.141 64678 typ srflx raddr       |                       |
   | 192.168.1.4 rport 64678                   |                       |
   | m=video 0 RTP/SAVPF 98 100                | Bob doesn't recognize |
   |                                           | bundle-only and hence |
   |                                           | rejects the video     |
   |                                           | stream                |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:98 VP8/90000                     | [draft-ietf-payload-v |
   |                                           | p8]                   |
   | a=rtpmap:100 VP8/90000                    | [draft-ietf-payload-v |
   |                                           | p8]                   |
   | a=imageattr:98 [x=1280,y=720]             | [RFC6236]Camera-1,Enc |
   |                                           | oding-1 Resolution    |
   | a=fmtp:98 max-fr=30                       | [RFC4566]             |





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   | a=imageattr:100 [x=640,y=480]             | [RFC6236]             |
   |                                           | Camera-1,Encoding-2   |
   |                                           | Resolution            |
   | a=fmtp:100 max-fr=15                      | [RFC4566]             |
   | m=video 0 RTP/SAVPF 98 100                | Bob doesn't recognize |
   |                                           | bundle-only and hence |
   |                                           | rejects the video     |
   |                                           | stream                |
   | c= IN IP4 24.23.204.141                   | [RFC4566]             |
   | a=rtpmap:101 H264/90000                   | [RFC3984]             |
   | a=rtpmap:103 H264/90000                   | [RFC3984]             |
   | a=fmtp:101                                | [RFC3984]Camera-2,Enc |
   | profile-level-id=4d0028;packetization-mod | oding-1 Resolution    |
   | e=1;max-fr=30                             |                       |
   | a=fmtp:100                                | [RFC3984]Camera-1,Enc |
   | profile-level-id=4d0028;packetization-mod | oding-2 Resolution    |
   | e=1;max-fr=15                             |                       |
   +-------------------------------------------+-----------------------+

                         Table 39: 5.5.4 SDP Anwer

5.5.5.  Session with Trickle ICE support

   In this example Alice and Bob negotiate using Tricke ICE to perform
   ICE candiate generation and connectivity checks.  This example also
   multiplexes audio and video stream via SDP BUNDLE framework.

title Audio/Video Session with ICE Trickle

note right of Alice
Alice and Bob know that they both support BUNDLE.
end note
Alice->Bob: Offer(Audio:Opus Video:VP8)
note right of Alice
Alice indicates support for ICE Trickle and BUNDLE
end note

Bob->Alice: Answer(Audio:Opus Video:VP8) indicating its support for BUNDLE
note left of Bob
Bob also indicates ICE Trickle support.
end note
Alice <-> Bob: 2Way Call with Audio and Video Multiplexed









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   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=alice 20518 0 IN IP4 0.0.0.0       | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE audio video           | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] Alice     |
   |                                      |  supports grouping of      |
   |                                      |  m=lines under BUNDLE      |
   |                                      |  semantics.                |
   | m=audio 10000 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | a=mid:foo                            | [RFC5888] - Audio m=line   |
   |                                      | part of BUNDLE group       |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:11111 cname=Q/NWs1ao1HmN4Xa5  | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=ice-options:trickle                | [draft-ivov-mmusic-trickle |
   |                                      | -ice]                      |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 10000 typ host           |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | m=video 10000 RTP/SAVPF 120          | [RFC4566]                  |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |



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   | a=mid:bar                            | [RFC5888] - Video m=line   |
   |                                      | with Bundle address same   |
   |                                      | as the audio m=line        |
   | c= IN IP4 24.23.204.141              | [RFC4566]                  |
   | b=AS:1000                            | [RFC4566]                  |
   | a=rtpmap:120 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:actpass                      | [RFC4145] - Alice can      |
   |                                      | perform DTLS before Answer |
   |                                      | arrives                    |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:22222 Q/NWs1ao1HmN4Xa5        | [RFC5576]                  |
   | a=ice-ufrag:074c6550                 | [RFC5245]                  |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245]                  |
   | f08a068                              |                            |
   | a=ice-options:trickle                | [draft-ivov-mmusic-trickle |
   |                                      | -ice]                      |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.4 10000 typ host           |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.4 64678 typ host           |                            |
   | a=rtcp-fb:120 nack                   | [RFC5104]                  |
   | a=rtcp-fb:120 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:120 ccm fir                | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                     Table 40: 5.4 SDP Offer w/BUNDLE





















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   +--------------------------------------+----------------------------+
   | SDP Contents                         | RFC#/Notes                 |
   +--------------------------------------+----------------------------+
   | v=0                                  | [RFC4566]                  |
   | o=bob 16833 0 IN IP4 0.0.0.0         | [RFC4566]                  |
   | s=                                   | [RFC4566]                  |
   | t=0 0                                | [RFC4566]                  |
   | a=group:BUNDLE audio video           | [draft-ietf-mmusic-sdp-bun |
   |                                      | dle-negotiation] - Bob     |
   |                                      |  supports BUNDLE semantics |
   |                                      | .                          |
   | m=audio 20000 RTP/SAVPF 109          | [RFC4566]                  |
   | a=msid:ma ta                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (ta)                       |
   | a=mid:foo                            | [RFC5888] - Audio m=line   |
   |                                      | part of the BUNDLE group   |
   | c= IN IP4 98.248.92.77               | [RFC4566]                  |
   | a=rtpmap:109 opus/48000/2            | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=ptime:20                           | [draft-ietf-payload-rtp-op |
   |                                      | us]                        |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-fb:109 nack                   | [RFC5104]                  |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:33333 cname:EocUG1f0fcg/yvY7  | [RFC5576]                  |
   | a=ice-ufrag:c300d85b                 | [RFC5245]                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=ice-options:trickle                | [draft-ivov-mmusic-trickle |
   |                                      | -ice]                      |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.7 20000 typ host           |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.7 60065 typ host           |                            |
   | m=video 20000 RTP/SAVPF 120          | [RFC4566]                  |
   | a=msid:ma tb                         | Identifies RTCMediaStream  |
   |                                      | ID (ma) and                |
   |                                      | RTCMediaStreamTrack ID     |
   |                                      | (tb)                       |




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   | a=mid:bar                            | [RFC5888] - Video m=line   |
   |                                      | with Bundle address same   |
   |                                      | as the audio m=line        |
   | c= IN IP4 98.248.92.77               | [RFC4566]                  |
   | a=rtpmap:120 VP8/90000               | [draft-ietf-payload-vp8]   |
   | a=sendrecv                           | [RFC3264]                  |
   | a=setup:active                       | [RFC4145] - Bob carries    |
   |                                      | out DTLS Handshake in      |
   |                                      | parallel                   |
   | a=rtcp-mux                           | [RFC5761]                  |
   | a=ssrc:44444 cname:EocUG1f0fcg/yvY7  | [RFC5576]                  |
   | a=ice-ufrag:c300d85b                 | [RFC5245]                  |
   | a=ice-pwd:de4e99bd291c325921d5d47efb | [RFC5245]                  |
   | abd9a2                               |                            |
   | a=ice-options:trickle                | [draft-ivov-mmusic-trickle |
   |                                      | -ice]                      |
   | a=fingerprint:sha-1                  | [RFC5245]                  |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9: |                            |
   | c7:70:9d:1f:66:79:a8:07              |                            |
   | a=candidate:0 1 UDP 2113667327       | [RFC5245]                  |
   | 192.168.1.7 20000 typ host           |                            |
   | a=candidate:0 2 UDP 2113667326       | [RFC5245]                  |
   | 192.168.1.7 60065 typ host           |                            |
   | a=rtcp-fb:120 nack                   | [RFC5104]                  |
   | a=rtcp-fb:120 nack pli               | [RFC5104]                  |
   | a=rtcp-fb:120 ccm fir                | [RFC5104]                  |
   +--------------------------------------+----------------------------+

                     Table 41: 5.4 SDP Answer w/BUNDLE

5.5.6.  Legacy Interop with RTP/AVP profile

   In this section, we attempt to provide session descriptions
   showcasing inter-operability between a WebRTC end-point and a Legacy
   VOIP end-point.  The ideas included in here are not fully baked into
   the standards and might be controversial in nature.  The hope here is
   to demonstrate a plausible SDP composition to enchance seamless
   inter-operability between the aforementioned communication systems.

   In the scenario desribed below, Alice sends [RFC3264] Offer with two
   sets of media descriptions per media type.
      One set that correponds to [WEBRTC] Compliant RTP/SAVPF based
      audio and video descriptions.
      Another set with RTP/AVP based audio and video descriptions for
      the legacy Interop purposes.
      Also to note, Alice includes session level DTLS information and
      media level RTCP feedback information as applicable to both the
      sets of media descriptions



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   On the other hand, Bob being a Legacy VOIP end-point, recognizes only
   the media descriptions with RTP/AVP as the application protocol.  The
   security and fedback requirements for the session are either handled
   by a intermediate gateway or with some combination of Bob's
   capabilities and the intermediate gateway.

   title Successful 2-Way WebRTC <-> VOIP Interop
   note right of Alice
   Alice is on a WebRTC end-point & Bob is behind a legacy VOIP system
   end note
   Alice->Bob: Offer(Audio:Opus Video:VP8)
   note right of Alice
    Alice includes 2 copies of media descriptions
    1. WebRTC compliant media description (RTP/SAVPF)
    2. Legacy compliant media description (RTP/AVP)
   end note
   Bob->Alice: Answer(Audio:Opus Video:VP8)
   note right of Bob
    Bob recognizes"legacy compliant" media description from Alice.
    and accepts the same.
   end note
   Alice->Bob: Two-way Opus Audio, VP8 Video
   note right of Alice
     Session also suports RTP/RTCP Mux, RTCP feedback (nack,pli)
   end note

   +---------------------------------------------+---------------------+
   | SDP Contents                                | RFC#/Notes          |
   +---------------------------------------------+---------------------+
   | v=0                                         | [RFC4566]           |
   | o=alice 20518 0 IN IP4 0.0.0.0              | [RFC4566]           |
   | s=                                          | [RFC4566]           |
   | t=0 0                                       | [RFC4566]           |
   | a=ice-ufrag:074c6550                        | [RFC5245]           |
   | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a068 | [RFC5245]           |
   | a=fingerprint:sha-1                         | [RFC5245]           |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70:9 |                     |
   | d:1f:66:79:a8:07                            |                     |
   | a=rtcp-rsize                                | [RFC5506]           |
   | m=audio 54609 RTP/SAVPF 109                 | [RFC4566]           |
   | c= IN IP4 24.23.204.141                     | [RFC4566]           |
   | a=rtpmap:109 opus/48000                     |                     |
   | a=ptime:20                                  |                     |
   | a=sendrecv                                  | [RFC3264]           |
   | a=rtcp-mux                                  | [RFC5761]           |
   | a=candidate:0 1 UDP 2113667327 192.168.1.4  | [RFC5245]           |
   | 54609 typ host                              |                     |




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   | a=candidate:1 1 UDP 694302207 24.23.204.141 | [RFC5245]           |
   | 54609 typ srflx raddr 192.168.1.4 rport     |                     |
   | 54609                                       |                     |
   | a=candidate:0 2 UDP 2113667326 192.168.1.4  | [RFC5245]           |
   | 64678 typ host                              |                     |
   | a=candidate:1 2 UDP 1694302206              | [RFC5245]           |
   | 24.23.204.141 64678 typ srflx raddr         |                     |
   | 192.168.1.4 rport 64678                     |                     |
   | a=rtcp-fb:109 nack                          | [RFC5104]           |
   | m=video 62537 RTP/SAVPF 120                 | [RFC4566]           |
   | c= IN IP4 24.23.204.141                     | [RFC4566]           |
   | a=rtpmap:120 VP8/90000                      | [draft-ietf-payload |
   |                                             | -vp8]               |
   | a=sendrecv                                  | [RFC3264]           |
   | a=rtcp-mux                                  | [RFC5761]           |
   | a=candidate:0 1 UDP 2113667327 192.168.1.4  | [RFC5245]           |
   | 62537 typ host                              |                     |
   | a=candidate:1 1 UDP 1694302207              | [RFC5245]           |
   | 24.23.204.141 62537 typ srflx raddr         |                     |
   | 192.168.1.4 rport 62537                     |                     |
   | a=candidate:0 2 2113667326 192.168.1.4      | [RFC5245]           |
   | 54721 typ host                              |                     |
   | a=candidate:1 2 UDP 1694302206              | [RFC5245]           |
   | 24.23.204.141 54721 typ srflx raddr         |                     |
   | 192.168.1.4 rport 54721                     |                     |
   | a=rtcp-fb:120 nack pli                      | [RFC5104]           |
   | a=rtcp-fb:120 ccm fir                       | [RFC5104]           |
   | ---------------                             | These set of media  |
   |                                             | descriptions are    |
   |                                             | for Legacy Inter-op |
   |                                             | purposes            |
   | m=audio 54732 RTP/AVP 109                   | [RFC4566]Alice      |
   |                                             | includes RTP/AVP    |
   |                                             | audio stream        |
   |                                             | description         |
   | c= IN IP4 24.23.204.141                     | [RFC4566]           |
   | a=fingerprint:sha-1                         | [RFC5245]           |
   | 99:41:49:83:4a:97:0e:1f:7f:7d:f9:c9:c7:70:9 |                     |
   | d:1f:66:79:a8:07                            |                     |
   | a=rtpmap:109 opus/48000                     |                     |
   | a=ptime:20                                  |                     |
   | a=sendrecv                                  | [RFC3264]           |
   | a=rtcp-mux                                  | [RFC5761]Alice      |
   |                                             | still includes      |
   |                                             | RTP/RTCP Mux        |
   |                                             | support             |
   | a=candidate:0 1 UDP 2113667327 192.168.1.4  | [RFC5245]           |
   | 54732 typ host                              |                     |



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   | a=candidate:1 1 UDP 694302207 24.23.204.141 | [RFC5245]           |
   | 54732 typ srflx raddr 192.168.1.4 rport     |                     |
   | 54732                                       |                     |
   | a=candidate:0 2 UDP 2113667326 192.168.1.4  | [RFC5245]           |
   | 64678 typ host                              |                     |
   | a=candidate:1 2 UDP 1694302206              | [RFC5245]           |
   | 24.23.204.141 64678 typ srflx raddr         |                     |
   | 192.168.1.4 rport 64678                     |                     |
   | a=rtcp-fb:109 nack                          | [RFC5104]She adds   |
   |                                             | her intent for NACK |
   |                                             | RTCP feedback       |
   |                                             | support             |
   | m=video 62445 RTP/AVP 120                   | [RFC4566]Alice      |
   |                                             | includes RTP/AVP    |
   |                                             | video stream        |
   |                                             | description         |
   | c= IN IP4 24.23.204.141                     | [RFC4566]           |
   | a=fingerprint:sha-1                         | [RFC5245]           |
   | 99:41:49:83:4a:97:0e:1f:ef:7d:f7:c9:c7:70:9 |                     |
   | d:1f:66:79:a8:07                            |                     |
   | a=rtpmap:120 VP8/90000                      | [draft-ietf-payload |
   |                                             | -vp8]               |
   | a=sendrecv                                  | [RFC3264]           |
   | a=rtcp-mux                                  | [RFC5761]Alice      |
   |                                             | intends to perform  |
   |                                             | RTP/RTCP Mux        |
   | a=candidate:0 1 UDP 2113667327 192.168.1.4  | [RFC5245]           |
   | 62445 typ host                              |                     |
   | a=candidate:1 1 UDP 1694302207              | [RFC5245]           |
   | 24.23.204.141 62537 typ srflx raddr         |                     |
   | 192.168.1.4 rport 62445                     |                     |
   | a=candidate:0 2 2113667326 192.168.1.4      | [RFC5245]           |
   | 54721 typ host                              |                     |
   | a=candidate:1 2 UDP 1694302206              | [RFC5245]           |
   | 24.23.204.141 54721 typ srflx raddr         |                     |
   | 192.168.1.4 rport 54721                     |                     |
   | a=rtcp-fb:120 nack pli                      | [RFC5104] Alice     |
   |                                             | indicates support   |
   |                                             | for Picture loss    |
   |                                             | Indication and NACK |
   |                                             | RTCP feedback       |
   | a=rtcp-fb:120 ccm fir                       | [RFC5104]           |
   +---------------------------------------------+---------------------+

                          Table 42: 6.1 SDP Offer






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   +---------------------------------------------+---------------------+
   | SDP Contents                                | RFC#/Notes          |
   +---------------------------------------------+---------------------+
   | v=0                                         | [RFC4566]           |
   | o=bob 16833 0 IN IP4 0.0.0.0                | [RFC4566]           |
   | s=                                          | [RFC4566]           |
   | t=0 0                                       | [RFC4566]           |
   | a=ice-ufrag:c300d85b                        | [RFC5245]           |
   | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a2  | [RFC5245]           |
   | a=fingerprint:sha-1                         | [RFC5245]           |
   | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70:9 |                     |
   | d:1f:66:79:a8:07                            |                     |
   | m=audio 49203 RTP/AVP 109                   | [RFC4566] Bob       |
   |                                             | accepts RTP/AVP     |
   |                                             | based audio stream  |
   | c= IN IP4 98.248.92.77                      | [RFC4566]           |
   | a=rtpmap:109 opus/48000                     |                     |
   | a=ptime:20                                  |                     |
   | a=sendrecv                                  | [RFC3264]           |
   | a=candidate:0 1 UDP 2113667327 192.168.1.7  | [RFC5245]           |
   | 49203 typ host                              |                     |
   | a=candidate:1 1 UDP 1694302207 98.248.92.77 | [RFC5245]           |
   | 49203 typ srflx raddr 192.168.1.7 rport     |                     |
   | 49203                                       |                     |
   | a=candidate:0 2 UDP 2113667326 192.168.1.7  | [RFC5245]           |
   | 60065 typ host                              |                     |
   | a=candidate:1 2 UDP 1694302206 98.248.92.77 | [RFC5245]           |
   | 60065 typ srflx raddr 192.168.1.7 rport     |                     |
   | 60065                                       |                     |
   | m=video 63130 RTP/SAVP 120                  | [RFC4566] Bob       |
   |                                             | accepts RTP/AVP     |
   |                                             | based video stram   |
   | c= IN IP4 98.248.92.771                     | [RFC4566]           |
   | a=rtpmap:120 VP8/90000                      | [draft-ietf-payload |
   |                                             | -vp8]               |
   | a=sendrecv                                  | [RFC3264]           |
   | a=candidate:0 1 UDP 2113667327 192.168.1.7  | [RFC5245]           |
   | 63130 typ host                              |                     |
   | a=candidate:1 1 UDP 1694302207 98.248.92.77 | [RFC5245]           |
   | 63130 typ srflx raddr 192.168.1.7 rport     |                     |
   | 63130                                       |                     |
   | a=candidate:0 2 UDP 2113667326 192.168.1.7  | [RFC5245]           |
   | 56607 typ host                              |                     |
   | a=candidate:1 2 UDP 1694302206 98.248.92.77 | [RFC5245]           |
   | 56607 typ srflx raddr 192.168.1.7 rport     |                     |
   | 56607                                       |                     |
   +---------------------------------------------+---------------------+




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                         Table 43: 6.1 SDP Answer


6.  IANA Considerations

   This document requires no actions from IANA.


7.  Change Log

   [RFC EDITOR NOTE:  Please remove this section when publishing]

   Changes from draft-nandakumar-rtcweb-sdp-02
   o  Major refactoring was done to group the examples in to categories
   o  SDP was updated through out to reflect JSEP-04 style of defining
      attributes per m=line than at the session level.
   o  Added 8 new examples.
   o  Updated references for Trickle, Unified Plan
   o  Add section to explain the syntax conventions followed in the
      examples.

   Changes from draft-nandakumar-rtcweb-sdp-01
   o  Updated references to OPUS RTP Payload Specification.
   o  Updated BUNDLE examples based on the latest
      draft-ietf-mmusic-sdp-bundle-negotiation.
   o  Added examples for multiple audio and video flows based on Unified
      Plan.
   o  Added new examples for RTX and FEC streams
   o  Updated Simulcast and SVC examples

   Changes from draft-nandakumar-rtcweb-sdp-00
   o  Fixed editorial comments on the mailing list.
   o  Updated Data-channel SDP information based on
      draft-ietf-mmusic-sctp-sdp.
   o  Updated BUNDLE examples based on
      draft-ietf-mmusic-sdp-bundle-negotiation.
   o  Added examples for few more BUNDLE variants
   o  Added new examples for Simulcast and SVC


8.  References

8.1.  Normative References

   [RFC3264]  Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
              with Session Description Protocol (SDP)", RFC 3264,
              June 2002.




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   [RFC4566]  Handley, M., Jacobson, V., and C. Perkins, "SDP: Session
              Description Protocol", RFC 4566, July 2006.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

8.2.  Informative References

   [RFC5245]  Rosenberg, J., "Interactive Connectivity Establishment
              (ICE): A Protocol for Network Address Translator (NAT)
              Traversal for Offer/Answer Protocols", RFC 5245,
              July 2006.

   [WEBRTC]   W3C, "WebRTC 1.0: Real-time Communication Between
              Browsers",
              <http://dev.w3.org/2011/webrtc/editor/webrtc.html> .

   [JSEP]     Uberti, J. and C. Jennigs, "Javascript Session
              Establishment Protocol", draft-ietf-rtcweb-jsep-01 (work
              in progress), December 2012.

   [RFC5506]  Johansson, I., "Support for Reduced-Size Real-Time
              Transport Control Protocol (RTCP): Opportunities and
              Consequences", RFC 5506, April 2009.

   [RFC3551]  Schulzrinne, H. and S. Casner, "RTP Profile for Audio and
              Video Conferences with Minimal Control", RFC 3551,
              July 2003.

   [RFC3952]  Duric, A. and S. Andersen, "Real-time Transport Protocol
              (RTP) Payload Format for internet Low Bit Rate Codec
              (iLBC) Speech", RFC 3952, December 2004.

   [RFC4796]  Hautakorpi, J. and G. Camarillo, "The Session Description
              Protocol (SDP) Content Attribute", RFC 4796,
              February 2007.

   [RFC5761]  Perkins, C. and M. Westerlund, "Multiplexing RTP Data and
              Control Packets on a Single Port", RFC 5761, April 2010.

   [RFC3556]  Casner, S., "Session Description Protocol (SDP) Bandwidth
              Modifiers for RTP Control Protocol (RTCP) Bandwidth",
              RFC 3556, July 2003.

   [RFC5104]  Wenger, S., Chandra, U., Westerlund, M., and B. Burman,
              "Codec Control Messages in the RTP Audio-Visual Profile
              with Feedback (AVPF)", RFC 5104, February 2008.




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   [RFC4588]  Rey, J., Leon, D., Miyazaki, A., Varsa, V., and R.
              Hakenberg, "RTP Retransmission Payload Format", RFC 4588,
              July 2006.

   [RFC5956]  Begen, A., "Forward Error Correction Grouping Semantics in
              the Session Description Protocol", RFC 5956,
              September 2010.

   [RFC5888]  Camarillo, G. and H. Schulzrinne, "RTP Payload Format for
              H.264 Video", RFC 5888, June 2010.

   [RFC6236]  Johansson, I. and K. Jung, "Negotiation of Generic Image
              Attributes in the Session Description Protocol (SDP)",
              RFC 6236, May 2011.

   [draft-ietf-payload-rtp-opus]
               Spittka, J., Vos, K., and JM. Valin, "RTP Payload Format
              for Opus Speech and Audio Codec",
              draft-ietf-payload-rtp-opus-00 (work in progress),
              July 2012.

   [draft-ietf-payload-vp8]
              Westin, P., Lundin, H., Glover, M., Uberti, J., and F.
              Galligan, "RTP Payload Format for VP8 Video",
              draft-ietf-payload-vp8-05 (work in progress), August 2012.

   [RFC3984]  Wenger, S., Hannuksela, M., Stockhammer, T., Westerlund,
              M., and D. Singer, "RTP Payload Format for H.264 Video",
              RFC 3984, February 2005.

   [RFC5583]  Schierl, T. and S. Wenger, "Signaling Media Decoding
              Dependency in the Session Description Protocol (SDP)",
              RFC 5583, July 2009.

   [RFC5576]  Lennox, J., Ott, J., and T. Schierl, "Source-Specific
              Media Attributes in the Session Description Protocol
              (SDP)", RFC 5576, June 2009.

   [draft-ietf-rtcweb-data-channel]
              Jesup, R., Loreto, S., and M. Tuexen, "RTCWeb Datagram
              Connection", draft-ietf-rtcweb-data-channel-01 (work in
              progress), September 2012.

   [draft-ietf-mmusic-sctp-sdp]
              Loreto, S. and G. Camarillo, "Stream Control Transmission
              Protocol (SCTP)-Based Media Transport in the Session
              Description Protocol (SDP)", draft-ietf-mmusic-sctp-sdp-03
              (work in progress), September 2012.



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   [draft-ietf-mmusic-sdp-bundle-negotiation]
              Holmberg, C., Alvestrand, H., and C. Jennings,
              "Multiplexing Negotiation Using Session Description
              Protocol (SDP) Port Numbers",
              draft-ietf-mmusic-sdp-bundle-negotiation-04 (work in
              progress), February 2013.

   [draft-roach-mmusic-unified-plan]
              Roach, A., Uberti, J., and M. Thomson, "A Unified Plan for
              Using SDP with Large Numbers of Media Flows",
              draft-roach-mmusic-unified-plan (work in progress),
              July 2013.

   [draft-ivov-mmusic-trickle-ice]
              Roach, A., Uberti, J., and M. Thomson, "A Unified Plan for
              Using SDP with Large Numbers of Media Flows",
              draft-ivov-mmusic-trickle-ice-01 (work in progress),
              July 2013.

   [draft-lennox-mmusic-sdp-source-selection]
              Lennox, J. and H. Schulzrinne, "Multiplexing Negotiation
              Using Session Description Protocol (SDP) Port Numbers",
              draft-lennox-mmusic-sdp-source-selection-05 (work in
              progress), October 2012.

   [draft-rescorla-avtcore-6222bis]
              Rescorla, E. and A. Begen, "Guidelines for Choosing RTP
              Control Protocol (RTCP) Canonical Names (CNAMEs)",
              draft-rescorla-avtcore-6222bis-00 (work in progress),
              October 2012.

   [RFC3550]  Schulzrinne, H., Schulzrinne, S., Frederick, R., and V.
              Jacobson, "RTP: A Transport Protocol for Real-Time
              Applications", RFC 2326, July 2003.

   [RFC3261]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
              A., Peterson, J., Sparks, R., Handley, M., and E.
              Schooler, "SIP: Session Initiation Protocol", RFC 3261,
              June 2002.

   [RFC2326]  Schulzrinne, H., Rao, A., and R. Lanphier, "Real Time
              Streaming Protocol (RTSP)", RFC 2326, April 1998.

   [RFC4145]  Fischl, J., Tschofenig, H., and E. Rescorla, "Framework
              for Establishing a Secure Real-time Transport Protocol
              (SRTP) Security Context Using Datagram Transport Layer
              Security (DTLS)", RFC 4145, May 2010.




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   [RFC2833]  Schulzrinne, H. and S. Petrack, "RTP Payload for DTMF
              Digits, Telephony Tones and Telephony Signals", RFC 2833,
              May 2000.

   [RFC6464]  Lennox, J., Ivov, E., and E. Marocco, "A Real-time
              Transport Protocol (RTP) Header Extension for Client-to-
              Mixer Audio Level Indication", RFC 6464, December 2011.

   [RFC6465]  Ivov, E., Marocco, E., and J. Lennox, "A Real-time
              Transport Protocol (RTP) Header Extension for Mixer-to-
              Client Audio Level Indication", RFC 6465, December 2011.


Authors' Addresses

   Suhas Nandakumar
   Cisco
   170 West Tasman Drive
   San Jose, CA  95134
   USA

   Email:  snandaku@cisco.com


   Cullen Jennings
   Cisco
   170 West Tasman Drive
   San Jose, CA  95134
   USA

   Phone:  +1 408 421-9990
   Email:  fluffy@cisco.com



















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