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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

参考答案: D

详细解析:

IP电话网关可以按要求对信号进行数字化处理、压缩和封装,并且它控制着IP电话终端设备之间的呼叫建立。


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