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

Document Type Replaced Internet-Draft (individual)
Last updated 2007-11-19 (latest revision 2007-07-08)
Replaced by draft-ietf-mmusic-sdp-source-attributes
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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 (

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