The IESG has received a request from the Multiparty Multimedia Session Control WG (mmusic) to consider the following document: - 'WebRTC MediaStream Identification in the Session Description Protocol' <draft-ietf-mmusic-msid-13.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 2016-05-24. 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 This document specifies a Session Description Protocol (SDP) Grouping mechanism for RTP media streams that can be used to specify relations between media streams. This mechanism is used to signal the association between the SDP concept of "media description" and the WebRTC concept of "MediaStream" / "MediaStreamTrack" using SDP signaling. This document is a work item of the MMUSIC WG, whose discussion list is mmusic@ietf.org. The file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-mmusic-msid/ IESG discussion can be tracked via https://datatracker.ietf.org/doc/draft-ietf-mmusic-msid/ballot/ No IPR declarations have been submitted directly on this I-D.