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Source-Specific Media Attributes in the Session Description Protocol (SDP)

Document Type Replaced Internet-Draft (individual)
Expired & archived
Author Jonathan Lennox
Last updated 2007-11-19 (Latest revision 2007-07-08)
Replaced by RFC 5576
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-mmusic-sdp-source-attributes
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This Internet-Draft is no longer active.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:


The Session Description Protocol provides mechanisms to describe attributes of multimedia sessions and of individual media streams (e.g., Real-time Transport Protocol (RTP) sessions) within a multimedia session, but does not provide any mechanism to describe individual media sources within a media stream. This document defines a mechanism to describe RTP media sources, identified by their Synchronization Source Identifiers (SSRCs), in SDP, associate attributes with these sources, and express relationships among sources. It also defines several source-level attributes which can be used to describe properties of media sources.


Jonathan Lennox

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