单选题Which IP telephony component provides call processing, such as signaling, that in a traditional voice network is provided by switching equipment, such as a PBX?（）AClient-based software, such as CiscoSoftPhoneBVoice gateways, such as the Cisco VG248 Analog Phone GatewayCCall-management hardware and software, such as CiscoCallManagerDAdvanced call-handling software, such as Cisco Unity
单选题
Which IP telephony component provides call processing, such as signaling, that in a traditional voice network is provided by switching equipment, such as a PBX?（）
A
Client-based software, such as CiscoSoftPhone
B
Voice gateways, such as the Cisco VG248 Analog Phone Gateway
C
Call-management hardware and software, such as CiscoCallManager
D
Advanced call-handling software, such as Cisco Unity
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