What is RTCP?
The RTP control protocol (RTCP) is based on the periodic transmission
of control packets to all participants in the session, using the same
distribution mechanism as the data packets.
Functions of RTCP
- It provides feedback on the quality of the data distribution.
Different types of packets are used. We will discuss those in the next
page.
- It carries a persistent transport-level identifier for an RTP
source called the canonical name or CNAME. SSRC may change from time to
time but CNAME remains the same. It is used to identify a participant
during the session. RTCP may also contain extra information for the
participants like email.
- By having each participant send its control packets to all the
others, each can independently observe the number of participants. This
number is used to calculate the rate at which the packets are sent. More
users in a session means an individual source may send packets less
frequently.
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