datatracker.ietf.org
Sign in
Version 5.3.0, 2014-04-12
Report a bug

Multiplexing Multiple RTP Sessions onto a Single Lower-Layer Transport
draft-westerlund-avtcore-transport-multiplexing-07

Document type: Active Internet-Draft (individual)
Document stream: No stream defined
Last updated: 2013-10-21
Intended RFC status: Unknown
Other versions: plain text, pdf, html

Stream State:No stream defined
Document shepherd: No shepherd assigned

IESG State: I-D Exists
Responsible AD: (None)
Send notices to: No addresses provided

Network Working Group                                      M. Westerlund
Internet-Draft                                                  Ericsson
Intended status: Standards Track                           C. S. Perkins
Expires: April 24, 2014                            University of Glasgow
                                                        October 21, 2013

 Multiplexing Multiple RTP Sessions onto a Single Lower-Layer Transport
           draft-westerlund-avtcore-transport-multiplexing-07

Abstract

   This memo defines a mechanism to allow multiple RTP sessions to be
   multiplexed onto a single lower-layer transport flow (e.g., onto a
   single UDP 5-tuple).  Requirements for multiplexing RTP sessions are
   discussed, along with the trade-off between the different options.  A
   shim-based multiplexing layer is proposed, along with associated
   signalling.

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 April 24, 2014.

Copyright Notice

   Copyright (c) 2013 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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

Westerlund & Perkins     Expires April 24, 2014                 [Page 1]
Internet-Draft Multiple RTP Sessions on Single Transport    October 2013

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Design Considerations . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Location of Multiplexing Shim Header  . . . . . . . . . .   9
     5.2.  ICE and DTLS-SRTP Integration . . . . . . . . . . . . . .  10
     5.3.  Signalling Fall Back  . . . . . . . . . . . . . . . . . .  10
   6.  Specification . . . . . . . . . . . . . . . . . . . . . . . .  11
     6.1.  Shim Layer  . . . . . . . . . . . . . . . . . . . . . . .  11
     6.2.  Signalling  . . . . . . . . . . . . . . . . . . . . . . .  15
     6.3.  SRTP Key Management . . . . . . . . . . . . . . . . . . .  16
       6.3.1.  Security Description  . . . . . . . . . . . . . . . .  16
       6.3.2.  DTLS-SRTP . . . . . . . . . . . . . . . . . . . . . .  17
       6.3.3.  MIKEY . . . . . . . . . . . . . . . . . . . . . . . .  17
     6.4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . .  18
       6.4.1.  Secure RTP Packet with Multiplexing Shim  . . . . . .  18
       6.4.2.  Basic RTP Multiplex Negotiation in SDP  . . . . . . .  19
       6.4.3.  Advanced RTP Multiplex Negotiation in SDP . . . . . .  20
   7.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .  20
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  21
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  21
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  21
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  21
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  22
     11.2.  Informational References . . . . . . . . . . . . . . . .  22
   Appendix A.  Possible Solutions . . . . . . . . . . . . . . . . .  24
     A.1.  Header Extension  . . . . . . . . . . . . . . . . . . . .  24
     A.2.  Multiplexing Shim . . . . . . . . . . . . . . . . . . . .  25
     A.3.  Single Session  . . . . . . . . . . . . . . . . . . . . .  26
     A.4.  Use the SRTP MKI field  . . . . . . . . . . . . . . . . .  27
     A.5.  Use an Octet in the Padding . . . . . . . . . . . . . . .  28
     A.6.  Redefine the SSRC field . . . . . . . . . . . . . . . . .  28

[include full document text]