RTP Header Extension for RTCP Source Description Items
draft-ietf-avtext-sdes-hdr-ext-03

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Document Type Active Internet-Draft (avtext WG)
Last updated 2016-02-15
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: August 18, 2016                                         R. Even
                                                     Huawei Technologies
                                                               M. Zanaty
                                                           Cisco Systems
                                                       February 15, 2016

         RTP Header Extension for RTCP Source Description Items
                   draft-ietf-avtext-sdes-hdr-ext-03

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

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   This Internet-Draft will expire on August 18, 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 August 18, 2016                [Page 1]
Internet-Draft            RTP HE for RTCP SDES             February 2016

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     2.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Specification . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  SDES Item Header Extension  . . . . . . . . . . . . . . .   5
       4.1.1.  One-Byte Format . . . . . . . . . . . . . . . . . . .   5
       4.1.2.  Two-Byte Format . . . . . . . . . . . . . . . . . . .   5
     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.  Reservation of the SDES URN sub-space . . . . . . . . . .  11
     5.2.  Registration of SDES Items  . . . . . . . . . . . . . . .  11
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   This specification defines an RTP header extension [RFC3550][RFC5285]
   that can carry RTCP source description (SDES) items.  By including
   selected SDES items in a header extension the determination of
   relationship and synchronization context for new RTP streams (SSRCs)
   in an RTP session can be optimized.  Which relationship and what
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