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Duplication Grouping Semantics in the Session Description Protocol (RFC7104) Disclosure Number: IPCOM000234604D
Original Publication Date: 2014-Jan-01
Included in the Prior Art Database: 2014-Jan-23
Document File: 20 page(s) / 18K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A. Begen: AUTHOR [+3]


The Real-time Transport Protocol (RTP) [RFC3550] is widely used today for delivering IPTV traffic and other real-time multimedia sessions. Many of these applications support very large numbers of receivers and rely on intra-domain UDP/IP multicast for efficient distribution of traffic within the network.

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Internet Engineering Task Force (IETF)                          A. Begen Request for Comments: 7104                                         Cisco Category: Standards Track                                         Y. Cai ISSN: 2070-1721                                                Microsoft                                                                    H. Ou                                                                    Cisco                                                             January 2014

    Duplication Grouping Semantics in the Session Description Protocol


   Packet loss is undesirable for real-time multimedia sessions, but it    can occur due to congestion or other unplanned network outages.  This    is especially true for IP multicast networks, where packet loss    patterns can vary greatly between receivers.  One technique that can    be used to recover from packet loss without incurring unbounded delay    for all the receivers is to duplicate the packets and send them in    separate redundant streams.  This document defines the semantics for    grouping redundant streams in the Session Description Protocol (SDP).    The semantics defined in this document are to be used with the SDP    Grouping Framework.  Grouping semantics at the Synchronization Source    (SSRC) level are also defined in this document for RTP streams using    SSRC multiplexing.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

 Begen, et al.                Standards Track                    [Page 1]
 RFC 7104          Duplication Grouping Semantics in SDP     January 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    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as...