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Duplication Grouping Semantics in the Session Description Protocol

Document Type Replaced Internet-Draft (individual)
Authors Ali C. Begen , Yiqun Cai , Heidi Ou
Last updated 2012-10-15 (Latest revision 2012-03-11)
Replaced by RFC 7104
Stream (None)
Intended RFC status (None)
Expired & archived
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-mmusic-duplication-grouping
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


Packet loss is undesirable for real-time multimedia sessions, but 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 [RFC5888]. SSRC-level (Synchronization Source) grouping semantics are also defined in this document for RTP streams using SSRC multiplexing.


Ali C. Begen
Yiqun Cai
Heidi Ou

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)