Correct Answer: D
Section: Voice Video
H.323 terminals must support the following standards:
H.245 specifies messages for opening and closing channels for media streams and other commands, requests, and indications. It is a control channel protocol.
Q.931 is a standard for call signaling used by H.323 within the context of H.225. It is also used by PRI links.
H.225 performs registration, admission, and status (RAS) signaling for H.323 sessions.
RTP is the transport layer protocol used to transport VoIP packets. RTCP is also a transport layer protocol.
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