The VoIP gateway can perform the digitization, (　)and encapsulation required, and it controls the setup of VoIP calls between the calling device and the called device.

题库:中级通信工程师 类型:最佳选择题 时间:2020-05-27 15:31:42 免费下载:《2015 年中级通信工程师考试上午真题》Word试卷

The VoIP gateway can perform the digitization, (　)and encapsulation required, and it controls the setup of VoIP calls between the calling device and the called device.
A.amplification
B.depression
C.radiation
D.compression

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