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Versions: (draft-terriberry-avp-codecs) 00 01 02 03 RFC 7007

avtcore                                                  T.B. Terriberry
Internet-Draft                                       Mozilla Corporation
Updates: 3551 (if approved)                               April 10, 2013
Intended status: Standards Track
Expires: October 12, 2013


  Update to Recommended Codecs for the RTP Profile for Audio and Video
               Conferences with Minimal Control (RTP/AVP)
                    draft-ietf-avtcore-avp-codecs-02

Abstract

   The RTP Profile for Audio and Video Conferences with Minimal Control
   (RTP/AVP) is the basis for many other profiles, such as the Secure
   Real-time Transport Protocol (RTP/SAVP), the Extended RTP Profile for
   Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/
   AVPF), and the Extended Secure RTP Profile for RTCP-Based Feedback
   (RTP/SAVPF).  This document updates the RTP/AVP profile (and by
   extension, the profiles that build upon it) to reflect changes in
   audio codec usage since the document was originally published.

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 October 12, 2013.

Copyright Notice

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

   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



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   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Updates to RFC 3551 . . . . . . . . . . . . . . . . . . . . .   2
     3.1.  Updates to Section 6  . . . . . . . . . . . . . . . . . .   2
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   3
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   3
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   [RFC3551] says that audio applications operating under the RTP/AVP
   profile SHOULD be able to send and receive PCMU and DVI4.  However,
   in practice, many RTP deployments do not support DVI4, and its
   utility is limited in the presence of much more modern codecs.  This
   document updates the recommended audio codec selection for the RTP/
   AVP profile to remove the SHOULD for DVI4.  By extension, this also
   updates the profiles which build on RTP/AVP, including RTP/SAVP
   [RFC3711], RTP/AVPF [RFC4585], and RTP/SAVPF [RFC5124].

2.  Terminology

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

3.  Updates to RFC 3551

   The following text of [RFC3551] is hereby updated as set forth below
   in Section 3.1.

   Audio applications operating under this profile SHOULD, at a minimum,
   be able to send and/or receive payload types 0 (PCMU) and 5 (DVI4).
   This allows interoperability without format negotiation and ensures
   successful negotiation with a conference control protocol.

3.1.  Updates to Section 6



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   In the final paragraph of Section 6, replace, "payload types 0 (PCMU)
   and 5 (DVI4)," with "payload type 0 (PCMU)."  Also, add a final
   sentence to this paragraph that states, "Some environments REQUIRE
   support for PCMU."  This results in the following paragraph:

   Audio applications operating under this profile SHOULD, at a minimum,
   be able to send and/or receive payload type 0 (PCMU).  This allows
   interoperability without format negotiation and ensures successful
   negotiation with a conference control protocol.  Some environments
   REQUIRE support for PCMU.

4.  Security Considerations

   This document does not introduce any new security considerations for
   [RFC3551].

5.  IANA Considerations

   This document has no actions for IANA.

6.  Acknowledgments

   Thanks to Colin Perkins for suggesting this update.

7.  References

7.1.  Normative References

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

   [RFC3551]  Schulzrinne, H. and S. Casner, "RTP Profile for Audio and
              Video Conferences with Minimal Control", STD 65, RFC 3551,
              July 2003.

7.2.  Informative References

   [RFC3711]  Baugher, M., McGrew, D., Naslund, M., Carrara, E., and K.
              Norrman, "The Secure Real-time Transport Protocol (SRTP)",
              RFC 3711, March 2004.

   [RFC4585]  Ott, J., Wenger, S., Sato, N., Burmeister, C., and J. Rey,
              "Extended RTP Profile for Real-time Transport Control
              Protocol (RTCP)-Based Feedback (RTP/AVPF)", RFC 4585, July
              2006.






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   [RFC5124]  Ott, J. and E. Carrara, "Extended Secure RTP Profile for
              Real-time Transport Control Protocol (RTCP)-Based Feedback
              (RTP/SAVPF)", RFC 5124, February 2008.

Author's Address

   Timothy B. Terriberry
   Mozilla Corporation
   650 Castro Street
   Mountain View, CA  94041
   USA

   Phone: +1 650 903-0800
   Email: tterribe@xiph.org




































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