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Network Working Group                                  M. Petit-Huguenin
Internet-Draft                                           Stonyfish, Inc.
Updates: 5245 (if approved)                             February 2, 2011
Intended status: Standards Track
Expires: August 6, 2011


                 Media level ice-options SDP attribute
           draft-petithuguenin-mmusic-ice-attributes-level-00

Abstract

   This document redefines the ice-options SDP attribute as a session-
   level and media-level attribute.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.  This document may not be modified,
   and derivative works of it may not be created, except to format it
   for publication as an RFC or to translate it into languages other
   than English.

   Internet-Drafts are working documents of the Internet Engineering
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   Internet-Drafts are draft documents valid for a maximum of six months
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   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 August 6, 2011.

Copyright Notice

   Copyright (c) 2011 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
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as



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   described in the Simplified BSD License.


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  ice-options Attribute . . . . . . . . . . . . . . . . . . . . . 3
   4.  rtp+ecn ICE option  . . . . . . . . . . . . . . . . . . . . . . 3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 4
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 4
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 4
   Appendix A.  Release notes  . . . . . . . . . . . . . . . . . . . . 5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 5


































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1.  Introduction

   ICE [RFC5245] defines the ice-options SDP attribute as session-level
   only attribute, but when ICE is used with disaggregated media (see
   section 3 of [I-D.loreto-splices-disaggregated-media]), there is a
   possibility that different media uses different ICE implementations
   and/or different networks, and so that differents media in the same
   SDP require different values for this attribute.

   As an example, the ice-options attribute value "rtp+ecn" (defined in
   [I-D.ietf-avtcore-ecn-for-rtp]) signals ECN capability.  Two
   aggregated media using two different RTP implementations may want to
   use different values for this attribute.

   Note that there is a similar problem for the ice-lite attribute but
   unfortunately it does not seem possible to design a way to use the
   ice-lite attribute at the media level that is compatible with legacy
   implementations that recognize only the session-level attribute.


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.  ice-options Attribute

   The ice-options attribute is a session-level and media-level
   attribute.

   All future new ICE options must also defines how media-level ICE
   options using this new value are aggregated to eventually generate
   the value of the session-level ICE option, so legacy implementations
   that only recognize session-level ICE options can interoperate with
   implementations that recognize ICE options at both levels.


4.  rtp+ecn ICE option

   If all aggregated media contains the "rtp+ecn" ICE option defined by
   [I-D.ietf-avtcore-ecn-for-rtp], then an "rtp+ecn" ICE option MUST be
   inserted at the session-level.







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5.  Security Considerations

   TBD


6.  IANA Considerations

   TBD


7.  Acknowledgements

   This document was written with the xml2rfc tool described in
   [RFC2629].


8.  References

8.1.  Normative References

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

   [RFC5245]  Rosenberg, J., "Interactive Connectivity Establishment
              (ICE): A Protocol for Network Address Translator (NAT)
              Traversal for Offer/Answer Protocols", RFC 5245,
              April 2010.

   [I-D.ietf-avtcore-ecn-for-rtp]
              Westerlund, M., Johansson, I., Perkins, C., and K.
              Carlberg, "Explicit Congestion Notification (ECN) for RTP
              over UDP", draft-ietf-avtcore-ecn-for-rtp-00 (work in
              progress), January 2011.

8.2.  Informative References

   [RFC2629]  Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629,
              June 1999.

   [I-D.loreto-splices-disaggregated-media]
              Camarillo, G. and S. Loreto, "Disaggregated Media in the
              Session Initiation Protocol (SIP)",
              draft-loreto-splices-disaggregated-media-00 (work in
              progress), September 2010.







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Appendix A.  Release notes

   This section must be removed before publication as an RFC.


Author's Address

   Marc Petit-Huguenin
   Stonyfish, Inc.

   Email: petithug@acm.org








































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