单选题What is a benefit of Internet protocol (IP) telephony?（）ASynchronizes password exchanges for call setupBEliminates the need for physical cabling in a TCP/IP networkCEnables two-way voice transmission over a packet-switched TCP/IP networkDCreates an encrypted tunnel for voice through a Transmission Control Protocol (TCP)/IP network
单选题
What is a benefit of Internet protocol (IP) telephony?（）
A
Synchronizes password exchanges for call setup
B
Eliminates the need for physical cabling in a TCP/IP network
C
Enables two-way voice transmission over a packet-switched TCP/IP network
D
Creates an encrypted tunnel for voice through a Transmission Control Protocol (TCP)/IP network
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