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The '''RTP Control Protocol''' ('''RTCP''') is a sister protocol of the [[Real-time Transport Protocol]] (RTP). Its basic functionality and packet structure is defined in RFC 3550. RTCP provides [[Out-of-band signaling|out-of-band]] statistics and control information for an RTP session. It partners with RTP in the delivery and packaging of multimedia data, but does not transport any media data itself.
It partners RTP in the delivery and packaging of multimedia data, but does not transport any data itself. It is used periodically to transmit control packets to participants in a streaming multimedia session. The primary function of RTCP is to provide feedback on the quality of service being provided by RTP.
The primary function of RTCP is to provide feedback on the [[quality of service]] (QoS) in media distribution by periodically sending statistics information such as transmitted [[Octet (computing)|octet]] and packet counts, [[packet loss]], [[packet delay variation]], and [[round-trip delay time]] to participants in a streaming multimedia session. An application may use this information to control quality of service parameters, perhaps by limiting flow, or using a different [[codec]].
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