The IESG has received a request from the Multiparty Multimedia Session Control WG (mmusic) to consider the following document: - 'Duplication Grouping Semantics in the Session Description Protocol' <draft-ietf-mmusic-duplication-grouping-03.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 2013-09-24. 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 Packet loss is undesirable for real-time multimedia sessions, but can occur due to congestion, or other unplanned network outages. This is especially true for IP multicast networks, where packet loss patterns can vary greatly between receivers. One technique that can be used to recover from packet loss without incurring unbounded delay for all the receivers is to duplicate the packets and send them in separate redundant streams. This document defines the semantics for grouping redundant streams in the Session Description Protocol (SDP). The semantics defined in this document are to be used with the SDP Grouping Framework. SSRC-level (Synchronization Source) grouping semantics are also defined in this document for RTP streams using SSRC multiplexing. The file can be obtained via http://datatracker.ietf.org/doc/draft-ietf-mmusic-duplication-grouping/ IESG discussion can be tracked via http://datatracker.ietf.org/doc/draft-ietf-mmusic-duplication-grouping/ballot/ No IPR declarations have been submitted directly on this I-D.
