RTP Control Protocol: Difference between revisions

Revision as of 09:13, 5 March 2025

Revision as of 12:04, 2 June 2025

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{{short description|Sister protocol of the Real-time Transport Protocol that provides control information}}

{{distinguish|Real Time Streaming Protocol}}

{{Infobox networking protocol

| title = RTP Control Protocol

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| hardware =

}}

{{distinguish|Real Time Streaming Protocol}}

{{short description|Sister protocol of the Real-time Transport Protocol that provides control information}}

The '''RTP Control Protocol''' ('''RTCP''') is a binary-encoded [[out-of-band signaling|out-of-band]] [[signaling protocol]] that functions alongside the [[Real-time Transport Protocol]] (RTP). RTCP provides 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.

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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]].

{{Internet protocol suite|application=[[RTP Control Protocol]]}}

== Protocol functions ==

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The Hierarchical Aggregation is used with [[Source-Specific Multicast]] where only a single source is allowed, i.e. [[IPTV]]. Another type of multicast could be [[Any-Source Multicast]] but it is not so suitable for large-scale applications with huge number of users.

{{asofas of|June 2007}}, only the most modern IPTV systems use Hierarchical aggregation.{{Citation needed|date=March 2009}}

=== Feedback Target ===