单项选择题
What is the term that is used to describe the process of converting a signal from digital to analog？（）
A. packetization B. quantization C. decoding D. sampling
多项选择题 WhataretworeasonstoimplementH·323gatekeepers？（）
多项选择题 WhatarethreefactorsusedtodeterminetheamountofbandwidththatisrequiredforasingleVoIPcall？（）
多项选择题 WhataretwowaystominimizethedelayofVoIPpacketsthataretraversinganetwork？（）
