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

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   This Internet-Draft will expire on August 6, 2011.

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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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.  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.


.  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].


.  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.


.  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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.  Security Considerations

   TBD


.  IANA Considerations

   TBD


.  Acknowledgements

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


.  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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