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
Answer: C
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