2.2.3 RTP Payload Format for Retransmitted RTP Packets and Packet-Pair Data

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A client that discovers that it has lost one or more RTP packets might ask the server to retransmit the lost RTP packets. This section defines an RTP payload format that can be used for transmitting copies of RTP packets.

This RTP payload format can also be used for transmitting packet-pair data. Packet-pair data can be used by the receiver to estimate the bottleneck bandwidth in the network path between the transmitter and the receiver.

These two different usage modes of the RTP payload format are defined in the following two sections.