问题:
A . A Voice over IP (VoIP) packet consists of the voice payload, IP header, TCP header, RTP header, and Layer 2 link header.
B . The voice carrier stream uses H323 to set up, maintain, and tear down call endpoints.
C . Call control signaling uses Real-Time Transport Protocol (RTP) packets that contain actual voice samples.
D . The sum of bandwidth necessary for each major application, including voice, video, and data, should not exceed 75 percent of the total available bandwidth for each link.
● 参考解析
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