Which statement is correct about AAR?

A.
The end users sees, “Network Congestion Rerouting?” but AAR is otherwise transparent to the
end user and works without user intervention.

B.
AAR will display “not enough bandwidth” on the IP phone while it reroutes the call.

C.
AAR allows calls to be rerouted because of insufficient Cisco Unified Border Element controlled
bandwidth to an ITSP.

D.
AAR allows calls to be rerouted due to insufficient gatekeeper controlled IP WAN bandwidth.

Explanation:
Automated alternate routing (AAR) provides a mechanism to reroute calls through the PSTN or other
network by using an alternate number when Cisco Unified Communications Manager blocks a call
due to insufficient location bandwidth. With automated alternate routing, the caller does not need
to hang up and redial the called party.
Link:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucmbe/admin/8_6_1/ccmcfg/b03aar.html