Which of the following best describes a function of RTCP?
A.
RTCP provides encryption, message authentication and integrity, and anti-replay service for voice streams.
B.
RTCP uses even-numbered UDP ports in the range 16,384-32,767 to transport voice payloads
C.
RTCP provides out-of-band control information for an RTP flow
D.
RTCP caches an RTP packet’s Layer 3 and Layer 4 headers in the routers at each end of a link, resulting in lower bandwidth demand for subsequent RTP packets.
C