单选题Which Internet Protocol(IP) telephony element is best categorizedas a voice application component?（）AVoice gatewayBPrivate branch exchange (PBX)CAdvanced audio conferencing softwareDIP telephone
单选题
Which Internet Protocol(IP) telephony element is best categorizedas a voice application component?（）
A
Voice gateway
B
Private branch exchange (PBX)
C
Advanced audio conferencing software
D
IP telephone
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