The Session Description Protocol (SDP) Application Token Attribute
draft-even-mmusic-application-token-02

The information below is for an old version of the document
Document Type Active Internet-Draft (individual)
Last updated 2014-01-03
Stream (None)
Intended RFC status (None)
Formats plain text pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
MMUSIC WG                                                        R. Even
Internet-Draft                                       Huawei Technologies
Intended status: Informational                                 J. Lennox
Expires: July 7, 2014                                              Vidyo
                                                                   Q. Wu
                                                     Huawei Technologies
                                                         January 3, 2014

   The Session Description Protocol (SDP) Application Token Attribute
               draft-even-mmusic-application-token-02.txt

Abstract

   The RTP fixed header includes the payload type number and the SSRC
   values of the RTP stream.  RTP defines how to de-multiplex streams
   within an RTP session, but in some use cases applications need
   further identifiers in order to identify the application semantics
   associated with particular streams within the session as conveyed in
   the signaling.

   This document defines a mechanism to provide the mapping between the
   SSRCs of RTP streams and the application semantics by defining
   extensions to RTP and RTCP messages.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on July 7, 2014.

Copyright Notice

   Copyright (c) 2014 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

Even, et al.              Expires July 7, 2014                  [Page 1]
Internet-Draft            SDP application token             January 2014

   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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  Proposal for Application ID  . . . . . . . . . . . . . . . . .  5
     3.1.  appId token  . . . . . . . . . . . . . . . . . . . . . . .  6
       3.1.1.  RTCP SDES message  . . . . . . . . . . . . . . . . . .  8
       3.1.2.  RTP Header Extension . . . . . . . . . . . . . . . . .  9
       3.1.3.  recv-appId . . . . . . . . . . . . . . . . . . . . . . 10
     3.2.  The "appId-group" media attribute  . . . . . . . . . . . . 10
     3.3.  appId attributes . . . . . . . . . . . . . . . . . . . . . 11
       3.3.1.  The "pt" appId attribute . . . . . . . . . . . . . . . 11
   4.  Using Application ID token in Offer / Answer . . . . . . . . . 11
   5.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 12
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 12
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 13
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 13
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14

Even, et al.              Expires July 7, 2014                  [Page 2]
Internet-Draft            SDP application token             January 2014

1.  Introduction

   The RTP [RFC3550] header includes the payload type number and the
   SSRC values of the RTP stream.  RTP defines how to de-multiplex
   streams within an RTP session, but in some use cases, applications
   need further identifiers in order to identify semantics associated
   with particular streams within the session.

   SDP [RFC4566] can be used to describe multiple RTP media streams in
   one or more m-lines that define a single SSRC multiplexed RTP session
   (as specified in [RFC3550]).  This addresses the WebRTC architecture
   [I-D.ietf-rtcweb-overview].

   A Unified Plan for Using SDP with Large Numbers of Media Flows
   [I-D.roach-mmusic-unified-plan] proposes that each m-line will
   represent a media source [I-D.ietf-avtext-rtp-grouping-taxonomy].  In
Show full document text