A Framework for SDP Attributes when Multiplexing
draft-ietf-mmusic-sdp-mux-attributes-03

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Replaces draft-nandakumar-mmusic-sdp-mux-attributes
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Network Working Group                                      S. Nandakumar
Internet-Draft                                                     Cisco
Intended status: Standards Track                        October 20, 2014
Expires: April 23, 2015

            A Framework for SDP Attributes when Multiplexing
                draft-ietf-mmusic-sdp-mux-attributes-03

Abstract

   The Session Description Protocol (SDP) provides mechanisms to
   describe attributes of multimedia sessions and of individual media
   streams (e.g., Real-time Transport Protocol (RTP) sessions) within a
   multimedia session.  In the RTCWeb WG, there is a need to use a
   single 5-tuple for sending and receiving media associated with
   multiple media descriptions ("m=" lines).  Such a requirement has
   raised concerns over the semantic implications of the SDP attributes
   associated with the RTP Media Streams multiplexed over a single
   transport layer flow.

   The scope of this specification is to provide a framework for
   analyzing the multiplexing characteristics of SDP attributes.  The
   specification also categorizes existing attributes based on the
   framework described herein.

Status of This Memo

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   This Internet-Draft will expire on April 23, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Nandakumar               Expires April 23, 2015                 [Page 1]
Internet-Draft         SDP Attribute Multiplexing           October 2014

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  SDP Attribute Analysis Framework  . . . . . . . . . . . . . .   6
     4.1.  Category: NORMAL  . . . . . . . . . . . . . . . . . . . .   7
     4.2.  Category: NOT RECOMMENDED . . . . . . . . . . . . . . . .   7
     4.3.  Category: IDENTICAL . . . . . . . . . . . . . . . . . . .   8
     4.4.  Category: SUM . . . . . . . . . . . . . . . . . . . . . .   8
     4.5.  Category: TRANSPORT . . . . . . . . . . . . . . . . . . .   9
     4.6.  Category: INHERIT . . . . . . . . . . . . . . . . . . . .  10
     4.7.  Category: IDENTICAL-PER-PT  . . . . . . . . . . . . . . .  10
     4.8.  Category: SPECIAL . . . . . . . . . . . . . . . . . . . .  11
     4.9.  Category: TBD . . . . . . . . . . . . . . . . . . . . . .  11
   5.  Analysis of Existing Attributes . . . . . . . . . . . . . . .  11
     5.1.  RFC4566 - SDP: Session Description Protocol . . . . . . .  12
     5.2.  RFC4585 - RTP/AVPF  . . . . . . . . . . . . . . . . . . .  13
     5.3.  RFC5761 - Multiplexing RTP and RTCP . . . . . . . . . . .  14
     5.4.  RFC3312 - Integration of Resource Management and (SIP)  .  14
     5.5.  RFC4574 - SDP Label Attribute . . . . . . . . . . . . . .  15
     5.6.  RFC5432 - QoS Mechanism Selection in SDP  . . . . . . . .  15
     5.7.  RFC4568 - SDP Security Descriptions . . . . . . . . . . .  16
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