Which three functions are associated with a Cisco Unified CallManager？ （）
- A、 connects traditional telephony devices to voice over IP infrastructure
- B、 converts analog signals to digital format
- C、 performs voice compression
- D、 performs call processing
- E、 performs dial plan administration
- F、 performs signaling and device control
正确答案:D,E,F
答案解析:有
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