Guidelines for using the Multiplexing Features of RTP to Support Multiple Media Streams
draft-ietf-avtcore-multiplex-guidelines-05

Document Type Active Internet-Draft (avtcore WG)
Last updated 2017-10-30
Replaces draft-westerlund-avtcore-multiplex-architecture
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Network Working Group                                      M. Westerlund
Internet-Draft                                                 B. Burman
Intended status: Informational                                  Ericsson
Expires: May 3, 2018                                          C. Perkins
                                                   University of Glasgow
                                                           H. Alvestrand
                                                                  Google
                                                                 R. Even
                                                                H. Zheng
                                                                  Huawei
                                                        October 30, 2017

    Guidelines for using the Multiplexing Features of RTP to Support
                         Multiple Media Streams
               draft-ietf-avtcore-multiplex-guidelines-05

Abstract

   The Real-time Transport Protocol (RTP) is a flexible protocol that
   can be used in a wide range of applications, networks, and system
   topologies.  That flexibility makes for wide applicability, but can
   complicate the application design process.  One particular design
   question that has received much attention is how to support multiple
   media streams in RTP.  This memo discusses the available options and
   design trade-offs, and provides guidelines on how to use the
   multiplexing features of RTP to support multiple media streams.

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 May 3, 2018.

Westerlund, et al.         Expires May 3, 2018                  [Page 1]
Internet-Draft     Guidelines for Multiplexing in RTP       October 2017

Copyright Notice

   Copyright (c) 2017 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Subjects Out of Scope . . . . . . . . . . . . . . . . . .   5
   3.  RTP Multiplexing Overview . . . . . . . . . . . . . . . . . .   5
     3.1.  Reasons for Multiplexing and Grouping RTP Media Streams .   5
     3.2.  RTP Multiplexing Points . . . . . . . . . . . . . . . . .   6
       3.2.1.  RTP Session . . . . . . . . . . . . . . . . . . . . .   7
       3.2.2.  Synchronisation Source (SSRC) . . . . . . . . . . . .   8
       3.2.3.  Contributing Source (CSRC)  . . . . . . . . . . . . .  10
       3.2.4.  RTP Payload Type  . . . . . . . . . . . . . . . . . .  10
     3.3.  Issues Related to RTP Topologies  . . . . . . . . . . . .  11
     3.4.  Issues Related to RTP and RTCP Protocol . . . . . . . . .  13
       3.4.1.  The RTP Specification . . . . . . . . . . . . . . . .  13
       3.4.2.  Multiple SSRCs in a Session . . . . . . . . . . . . .  15
       3.4.3.  Binding Related Sources . . . . . . . . . . . . . . .  15
       3.4.4.  Forward Error Correction  . . . . . . . . . . . . . .  17
   4.  Particular Considerations for RTP Multiplexing  . . . . . . .  17
     4.1.  Interworking Considerations . . . . . . . . . . . . . . .  17
       4.1.1.  Types of Interworking . . . . . . . . . . . . . . . .  17
       4.1.2.  RTP Translator Interworking . . . . . . . . . . . . .  18
       4.1.3.  Gateway Interworking  . . . . . . . . . . . . . . . .  18
       4.1.4.  Multiple SSRC Legacy Considerations . . . . . . . . .  19
     4.2.  Network Considerations  . . . . . . . . . . . . . . . . .  20
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