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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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