RTP Header Extension for RTCP Source Description Items
draft-ietf-avtext-sdes-hdr-ext-06

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Document Type Active Internet-Draft (avtext WG)
Last updated 2016-05-05 (latest revision 2016-04-26)
Replaces draft-westerlund-avtext-sdes-hdr-ext
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Network Working Group                                      M. Westerlund
Internet-Draft                                                 B. Burman
Intended status: Standards Track                                Ericsson
Expires: October 28, 2016                                        R. Even
                                                     Huawei Technologies
                                                               M. Zanaty
                                                           Cisco Systems
                                                          April 26, 2016

         RTP Header Extension for RTCP Source Description Items
                   draft-ietf-avtext-sdes-hdr-ext-06

Abstract

   Source Description (SDES) items are normally transported in RTP
   control protocol (RTCP).  In some cases it can be beneficial to speed
   up the delivery of these items.  Mainly when a new source (SSRC)
   joins an RTP session and the receivers needs this source's identity,
   relation to other sources, or its synchronization context, all of
   which may be fully or partially identified using SDES items.  To
   enable this optimization, this document specifies a new RTP header
   extension that can carry SDES items.

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
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   This Internet-Draft will expire on October 28, 2016.

Copyright Notice

   Copyright (c) 2016 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

Westerlund, et al.      Expires October 28, 2016                [Page 1]
Internet-Draft            RTP HE for RTCP SDES                April 2016

   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     2.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Specification . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  SDES Item Header Extension  . . . . . . . . . . . . . . .   5
       4.1.1.  One-Byte Format . . . . . . . . . . . . . . . . . . .   5
       4.1.2.  Two-Byte Format . . . . . . . . . . . . . . . . . . .   6
     4.2.  Usage of the SDES Item Header Extension . . . . . . . . .   6
       4.2.1.  One or Two Byte Headers . . . . . . . . . . . . . . .   6
       4.2.2.  MTU and Packet Expansion  . . . . . . . . . . . . . .   7
       4.2.3.  Transmission Considerations . . . . . . . . . . . . .   7
       4.2.4.  Different Usages  . . . . . . . . . . . . . . . . . .   9
       4.2.5.  SDES Items in RTCP  . . . . . . . . . . . . . . . . .   9
       4.2.6.  Update Flaps  . . . . . . . . . . . . . . . . . . . .  10
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
     5.1.  Registration of an SDES Base URN  . . . . . . . . . . . .  11
     5.2.  Creation of an SDES Sub-Registry  . . . . . . . . . . . .  11
     5.3.  Registration of SDES Items  . . . . . . . . . . . . . . .  12
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  13
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   This specification defines an RTP header extension [RFC3550][RFC5285]
   that can carry RTCP source description (SDES) items.  Normally the
   SDES items are carried in their own RTCP packet type [RFC3550].  By
   including selected SDES items in a header extension the determination
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