题目内容

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?（）

Advanced call-handling software, such as Cisco Unity
B. Call-management hardware and software, such as CiscoCallManager
Client-based software, such as CiscoSoftPhone
D. Voice gateways, such as the Cisco VG248 Analog Phone Gateway

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