Using SSRC with WebRTC Simulcast

Document Type Expired Internet-Draft (individual)
Author Harald Alvestrand 
Last updated 2020-01-07 (latest revision 2019-07-06)
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This Internet-Draft is no longer active.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 a convention for sending "a=ssrc" attributes in SDP together with "a=simulcast" attributes. This allows SFUs that need SSRC information to have this info easily accessible. Given that it is intended as an interim measure, it does not aim for being published as an RFC.


Harald Alvestrand (

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