Which statement is true about IP telephony calls？（）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 en

题目

Which statement is true about IP telephony calls？（）

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.

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正确答案:D

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Which statement is&#

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