RTP Control Protocol: Difference between revisions

Revision as of 16:34, 11 July 2018

Revision as of 07:35, 10 October 2019

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RTCP provides basic functions expected to be implemented in all RTP sessions:

*The primary function of RTCP is to gather statistics on quality aspects of the media distribution during a session and transmit this data to the session media source and other session participants. Such information may be used by the source for adaptive media encoding ([[codec]]) and detection of transmission faults. If the session is carried over a multicast network, this permits non-intrusive session quality monitoring.

*RTCP provides canonical end-point identifiers ([[CNAME]]) to all session participants. Although a source identifier (SSRC) of an RTP stream is expected to be unique, the instantaneous binding of source identifiers to end-points may change during a session. The CNAME establishes unique identification of end-points across an application instance (multiple use of media tools) and for third-party monitoring.

*Provisioning of session control functions. RTCP is a convenient means to reach all session participants, whereas RTP itself is not. RTP is only transmitted by a media source.