Using Simulcast in SDP and RTP Sessions
draft-ietf-mmusic-sdp-simulcast-03

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Document Type Active Internet-Draft (mmusic WG)
Last updated 2015-10-19
Replaces draft-burman-mmusic-sdp-simulcast
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Stream WG state WG Document (wg milestone: Oct 2017 - Submit Using Simulca... )
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Network Working Group                                          B. Burman
Internet-Draft                                             M. Westerlund
Intended status: Standards Track                                Ericsson
Expires: April 21, 2016                                    S. Nandakumar
                                                               M. Zanaty
                                                                   Cisco
                                                        October 19, 2015

                Using Simulcast in SDP and RTP Sessions
                   draft-ietf-mmusic-sdp-simulcast-03

Abstract

   In some application scenarios it may be desirable to send multiple
   differently encoded versions of the same media source in different
   RTP streams.  This is called simulcast.  This document discusses the
   best way of accomplishing simulcast in RTP and how to signal it in
   SDP.  A solution is defined by making an extension to SDP, and using
   RTP/RTCP identification methods to relate RTP streams belonging to
   the same media source.  The SDP extension consists of a new media
   level SDP attribute that expresses capability to send and/or receive
   simulcast RTP streams.  RTP/RTCP identification using either payload
   types or a separately defined method for RTP stream configuration are
   defined.

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
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   This Internet-Draft will expire on April 21, 2016.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Burman, et al.           Expires April 21, 2016                 [Page 1]
Internet-Draft                  Simulcast                   October 2015

   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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Reaching a Diverse Set of Receivers . . . . . . . . . . .   5
     3.2.  Application Specific Media Source Handling  . . . . . . .   6
     3.3.  Receiver Media Source Preferences . . . . . . . . . . . .   7
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Detailed Description  . . . . . . . . . . . . . . . . . . . .   9
     6.1.  Simulcast Capability  . . . . . . . . . . . . . . . . . .   9
       6.1.1.  Declarative Use . . . . . . . . . . . . . . . . . . .  11
       6.1.2.  Offer/Answer Use  . . . . . . . . . . . . . . . . . .  12
     6.2.  Relating Simulcast Streams  . . . . . . . . . . . . . . .  14
     6.3.  Signaling Examples  . . . . . . . . . . . . . . . . . . .  14
       6.3.1.  Unified Plan Client . . . . . . . . . . . . . . . . .  14
       6.3.2.  Multi-Source Client . . . . . . . . . . . . . . . . .  16
   7.  Network Aspects . . . . . . . . . . . . . . . . . . . . . . .  18
   8.  Limitations . . . . . . . . . . . . . . . . . . . . . . . . .  18
     8.1.  Single RTP Session  . . . . . . . . . . . . . . . . . . .  18
     8.2.  SDP Format Identification . . . . . . . . . . . . . . . .  19
     8.3.  RID Identification  . . . . . . . . . . . . . . . . . . .  19
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  20
   11. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  20
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  20
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