by Matthew G. Naugle
Wiley Computer Publishing, John Wiley & Sons, Inc.
ISBN: 0471196568 Pub Date: 11/01/98
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Illustrated TCP/IP
by Matthew G. Naugle Wiley Computer Publishing, John Wiley & Sons, Inc. ISBN: 0471196568 Pub Date: 11/01/98 |
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RTCP (Real-Time Control Protocol) is the control mechanism for RTP and it provides information, in the form of feedback, on network conditions and reception quality. Using RTCP allows RTP applications to adapt to variances in the media. For example, a router carrying the stream could become overloaded and slow down the forwarding of packets. Another application on the network is using considerable bandwidth and the receivers of RTP cannot receive as many packets as quickly as they want to. RTCP allows for control information to be distributed to not only the server but also the receivers. This allows for receivers and senders to make their own decisions about the quality. Another feature of RTCP is the gathering of user information. RTCP reports who that are attending a “session.”
RTP can work alone, but usually does not. RTP relies on RTCP to control information. The message format that RTP uses is the same format for all of its message.
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