问题:
A . CAC is implemented in the call setup phase to allocate bandwidth resources
B . CAC is implemented in the call maintenance phase to allocate bandwidth resources
C . CAC is utilized during the call teardown phase to ensure that all resources have been released
D . CAC uses the Cisco RSVP (Resource Reservation Protocol) Agent to integrate call-processing capabilities with the underlying network infrastructure
E . CAC is implemented in the call setup phase to determine the destination of the call
● 参考解析
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