试题详情
- 单项选择题What is a benefit of Internet protocol (IP) telephony?（）
A、Synchronizes password exchanges for call setup
B、Creates an encrypted tunnel for voice through a Transmission Control Protocol (TCP)/IP network
C、Enables two-way voice transmission over a packet-switched TCP/IP network
D、Eliminates the need for physical cabling in a TCP/IP network
- C
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