Marking and Selectively Retransmitting High-Priority Packets in the Real-Time Transport Protocol (RTP)

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Last updated 2006-06-19
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


In some circumstances, it is useful and desirable for the sender of an RTP stream to be able to deliver a subset of its RTP packets reliably. One example of this is a video codec which can encode a video stream such that decoder state can be maintained using just a subset of the packets encoded. However, existing RTP reliability mechanisms only define mechanisms which retransmit all the packets of an RTP stream. This document describes a mechanism by which the sender of an RTP stream can mark a subset of the packets of an RTP stream as high- priority recoverable packets, and by which the receiver of the stream can request retransmission of the high-priority packets.


Jonathan Lennox (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)