单选题When calls are denied by call admission control （CAC）， the calls are rerouted through the PSTN via the use of which Cisco CallManager feature？（）Aautomated alternate routing （AAR）BCisco CallManager Attendant ConsoleCreal-time protocol （RTP）DSurvivable Remote Site Telephony （SRST）
单选题
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）
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