Sending Multiple Types of Media in a Single RTP Session
draft-ietf-avtcore-multi-media-rtp-session-13

Document Type Active Internet-Draft (avtcore WG)
Last updated 2016-01-04 (latest revision 2015-12-18)
Replaces draft-westerlund-avtcore-multi-media-rtp-session
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Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication Apr 2015
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AVTCORE WG                                                 M. Westerlund
Internet-Draft                                                  Ericsson
Updates: 3550, 3551 (if approved)                             C. Perkins
Intended status: Standards Track                   University of Glasgow
Expires: June 20, 2016                                         J. Lennox
                                                                   Vidyo
                                                       December 18, 2015

        Sending Multiple Types of Media in a Single RTP Session
             draft-ietf-avtcore-multi-media-rtp-session-13

Abstract

   This document specifies how an RTP session can contain RTP 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 and RFC 3551 to enable this behaviour 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 June 20, 2016.

Copyright Notice

   Copyright (c) 2015 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 June 20, 2016                 [Page 1]
Internet-Draft   Multiple Media Types in an RTP Session    December 2015

   to this document.  Code Components extracted from this document must
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Background and Motivation . . . . . . . . . . . . . . . . . .   3
   4.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Using Multiple Media Types in a Single RTP Session  . . . . .   6
     5.1.  Allowing Multiple Media Types in an RTP Session . . . . .   6
     5.2.  Demultiplexing media types within an RTP session  . . . .   7
     5.3.  Per-SSRC Media Type Restrictions  . . . . . . . . . . . .   8
     5.4.  RTCP Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  Extension Considerations  . . . . . . . . . . . . . . . . . .   9
     6.1.  RTP Retransmission Payload Format . . . . . . . . . . . .   9
     6.2.  RTP Payload Format for Generic FEC  . . . . . . . . . . .  10
     6.3.  RTP Payload Format for Redundant Audio  . . . . . . . . .  11
   7.  Signalling  . . . . . . . . . . . . . . . . . . . . . . . . .  12
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     11.2.  Informative References . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   The Real-time Transport Protocol [RFC3550] was designed to use
   separate RTP sessions to transport different types of media.  This
   implies that different transport layer flows are used for different
   RTP streams.  For example, a video conferencing application might
   send audio and video traffic RTP flows on separate UDP ports.  With
   increased use of network address/port translation, firewalls, and
   other middleboxes it is, however, becoming difficult to establish
   multiple transport layer flows between endpoints.  Hence, there is
   pressure to reduce the number of concurrent transport flows used by
   RTP applications.
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