The IESG has received a request from the Multiparty Multimedia Session Control WG (mmusic) to consider the following document: - 'Using Simulcast in SDP and RTP Sessions' <draft-ietf-mmusic-sdp-simulcast-12.txt> as Proposed Standard The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the ietf@ietf.org mailing lists by 2018-04-24. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. Abstract 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 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 relate those RTP streams as being 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. The file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-simulcast/ IESG discussion can be tracked via https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-simulcast/ballot/ The following IPR Declarations may be related to this I-D: https://datatracker.ietf.org/ipr/2536/
