Duplication Grouping Semantics in the Session Description Protocol (RFC7104)
Original Publication Date: 2014-Jan-01
Included in the Prior Art Database: 2014-Jan-23
Internet Society Requests For Comment (RFCs)
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.
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 http://www.rfc-editor.org/info/rfc7104.
Begen, et al. Standards Track [Page 1]
RFC 7104 Duplication Grouping Semantics in SDP January 2014
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