Duplication Grouping Semantics in the Session Description Protocol
2014
Packet loss is undesirable for real-time multimedia sessions, but it
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. Grouping semantics at the Synchronization Source
(SSRC) level are also defined in this document for RTP streams using
SSRC multiplexing.
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