Using Simulcast in Session Description Protocol (SDP) and RTP Sessions
RFC 8853

Received changes through RFC Editor sync (created alias RFC 8853, changed title to 'Using Simulcast in Session Description Protocol (SDP) and RTP Sessions', changed abstract to 'In some application scenarios, it may be desirable to send multiple differently encoded versions of the same media source in different RTP streams.  This is called simulcast.  This document describes how to accomplish simulcast in RTP and how to signal it in the Session Description Protocol (SDP).  The described solution uses an RTP/RTCP identification method to identify RTP streams belonging to the same media source and makes an extension to SDP to indicate that those RTP streams are different simulcast formats of that media source.  The SDP extension consists of a new media-level SDP attribute that expresses capability to send and/or receive simulcast RTP streams.', changed pages to 30, changed standardization level to Proposed Standard, changed state to RFC, added RFC published event at 2021-01-19, changed IESG state to RFC Published)