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RTP Retransmission Payload Format

RTP retransmission is an effective packet loss recovery technique for
real-time applications with relaxed delay bounds. This document
describes an RTP payload format for performing retransmissions.
Retransmitted RTP packets are sent in a separate stream from the
original RTP stream. It is assumed that feedback from receivers to
senders is available. In particular, it is assumed that RTCP feedback
as defined in the extended RTP profile for RTCP-based feedback
(denoted RTP/AVPF), is available in this memo.