Multiple Synchronization Sources (SSRC) in SDP Media Descriptions

Document Type Expired Internet-Draft (individual)
Authors Christer Holmberg  , Magnus Westerlund  , Bo Burman  , Fredrik Jansson 
Last updated 2014-03-23 (latest revision 2013-09-19)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes use-cases where endpoints, for a given media type, use multiple media sources. It also describes how endpoints normally support media sources, and limitations associated with the support of multiple sources. This document also defines two new SDP attributes, "max-send-ssrc" and "max-recv-ssrc". The attributes allows an entity to, for a given media description, indicate sending and receiving capabilities of multiple media sources, based on codec usage .


Christer Holmberg (
Magnus Westerlund (
Bo Burman (
Fredrik Jansson (

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