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The previous article introduced the RTP protocol. Usually RTP is responsible for transmitting data, and RTCP works together. RTCP is responsible for controlling RTP communication and sessions (such as flow control, congestion control, session source management, etc.); like the RTP protocol, the protocol consists of IETF (http://www.ietf.org/) is defined in RFC 3550 Section 6 and 3551; RTCP has the following four functions:
- Its most basic function is to provide quality feedback on data distribution. This feedback function has two implementations: RTCP sender and receiver report, which are in Section 6.4 of the RFC document ;
- When only SSRC is used as a source identifier, there may be conflicts (possibility of duplication); RTCP will carry a reliable identifier for the RTP data source to identify this is usually unique, usually called CNAME (or cano