A Framework for SDP Attributes when Multiplexing
draft-ietf-mmusic-sdp-mux-attributes-11

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Last updated 2016-01-04
Replaces draft-nandakumar-mmusic-sdp-mux-attributes
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Network Working Group                                      S. Nandakumar
Internet-Draft                                                     Cisco
Intended status: Standards Track                         January 4, 2016
Expires: July 7, 2016

            A Framework for SDP Attributes when Multiplexing
                draft-ietf-mmusic-sdp-mux-attributes-11

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.  Typically media associated with individual media
   descriptions ("m=" lines) represent RTP sessions and are thus carried
   over individual underlying transport layer flows.  For scenarios
   where SDP is used to negotiate the usage of single 5-tuple for
   sending and receiving media associated with multiple media
   descriptions, it is required to understand the semantic implications
   of the SDP attributes associated with the RTP Media Streams
   multiplexed over a single underlying transport layer flow.

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

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on July 7, 2016.

Nandakumar                Expires July 7, 2016                  [Page 1]
Internet-Draft         SDP Attribute Multiplexing           January 2016

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Table of Contents

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