Multiple Media Types in an RTP Session
draft-ietf-avtcore-multi-media-rtp-session-00

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Last updated 2012-10-11
Replaces draft-westerlund-avtcore-multi-media-rtp-session
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AVTCORE WG                                                 M. Westerlund
Internet-Draft                                                  Ericsson
Updates: 3550 (if approved)                                   C. Perkins
Intended status: Standards Track                   University of Glasgow
Expires: April 11, 2013                                        J. Lennox
                                                                   Vidyo
                                                         October 8, 2012

                 Multiple Media Types in an RTP Session
             draft-ietf-avtcore-multi-media-rtp-session-00

Abstract

   This document specifies how an RTP session can contain media streams
   with media from multiple media types such as audio, video, and text.
   This has been restricted by the RTP Specification, and thus this
   document updates RFC 3550 to enable this behavior for applications
   that satisfy the applicability for using multiple media types in a
   single RTP session.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 11, 2013.

Copyright Notice

   Copyright (c) 2012 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
   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
   carefully, as they describe your rights and restrictions with respect

Westerlund, et al.       Expires April 11, 2013                 [Page 1]
Internet-Draft   Multiple Media Types in an RTP Session     October 2012

   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     2.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  4
     2.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Motivation . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     3.1.  NAT and Firewalls  . . . . . . . . . . . . . . . . . . . .  4
     3.2.  No Transport Level QoS . . . . . . . . . . . . . . . . . .  5
     3.3.  Architectural Equality . . . . . . . . . . . . . . . . . .  5
   4.  Overview of Solution . . . . . . . . . . . . . . . . . . . . .  5
   5.  Applicability  . . . . . . . . . . . . . . . . . . . . . . . .  6
     5.1.  Usage of the RTP session . . . . . . . . . . . . . . . . .  6
     5.2.  Signalled Support  . . . . . . . . . . . . . . . . . . . .  6
     5.3.  Homogeneous Multi-party  . . . . . . . . . . . . . . . . .  7
     5.4.  Reduced number of Payload Types  . . . . . . . . . . . . .  8
     5.5.  Stream Differentiation . . . . . . . . . . . . . . . . . .  8
     5.6.  Non-compatible Extensions  . . . . . . . . . . . . . . . .  8
   6.  RTP Session Specification  . . . . . . . . . . . . . . . . . .  9
     6.1.  RTP Session  . . . . . . . . . . . . . . . . . . . . . . .  9
     6.2.  Sender Source Restrictions . . . . . . . . . . . . . . . . 10
     6.3.  Payload Type Applicability . . . . . . . . . . . . . . . . 10
     6.4.  RTCP . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
   7.  Extension Considerations . . . . . . . . . . . . . . . . . . . 11
     7.1.  RTP Retransmission . . . . . . . . . . . . . . . . . . . . 12
     7.2.  Generic FEC  . . . . . . . . . . . . . . . . . . . . . . . 12
   8.  Signalling . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     8.1.  SDP-Based Signalling . . . . . . . . . . . . . . . . . . . 13
   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 13
   10. Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 13
   12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     12.1. Normative References . . . . . . . . . . . . . . . . . . . 14
     12.2. Informative References . . . . . . . . . . . . . . . . . . 14
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