Users are reporting that several inter-site calls are failing, and the message "not enough bandwidth" is showing on the display. Voice traffic between locations goes through corporate WAN, and Call Ad

Question

Options

• ADisable Call Admission Control and let the calls use the amount of bandwidth they require.
• BConfigure Call Queuing so that the user waits until there is bandwidth available
• CConfigure AAR to reroute calls that are denied by Call Admission Control through the PSTN.
• DReroute all calls through the PSTN and avoid using WAN.

• A
  10% (5)
• B
  6% (3)
• C
  82% (40)
• D
  2% (1)

Explanation

Automated Alternate Routing (AAR) is Cisco UCM's built-in mechanism to handle Call Admission Control (CAC) rejections gracefully. When CAC determines that a WAN link does not have enough bandwidth for a new call, it blocks the call and triggers AAR. AAR then automatically reroutes the blocked call through an alternate path - typically the PSTN - without requiring the user to manually redial. This resolves the 'not enough bandwidth' error for users while preserving WAN bandwidth by offloading overflow calls to the PSTN. Option A (disabling CAC) would allow calls to degrade WAN quality for all users. Option B (Call Queuing) is not a standard Cisco UCM feature for bandwidth-denied calls. Option D (routing all calls through PSTN) eliminates the benefit of the WAN and is not cost-effective.

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