When calls are denied by call admission control （CAC）， the calls are rerouted through the PSTN via the use of which Cisco CallManager feature？（）
- A、automated alternate routing （AAR）
- B、Cisco CallManager Attendant Console
- C、real-time protocol （RTP）
- D、Survivable Remote Site Telephony （SRST）
正确答案:A
答案解析:有
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