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RTCP (Real-Time Control Protocol)

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RTCP is the control protocol for RTP (Real-time Transport Protocol). It is used to periodically transmit control packets to participants in a streaming multimedia session. RTCP's primary function is to provide feedback on the quality of service being provided. This feedback may be used to scale back the sender for flow-control reasons or to keep from congesting the network. The sender may also use the information to change the current compression ratio. RTCP is outlined in 1889 (RTP: A Transport Protocol for Real-Time Applications, January 1996). See "Multimedia" for a discussion of RTP and RTCP.

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