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CHAPTER
37-1
Cisco Unified Communications Manager Administration Guide
OL-18611-01
37
Automated Alternate Routing Group
Configuration
Use the following topics to find, add, update, or delete AAR groups:
• AAR Group Configuration Settings, page 37-1
• Finding an AAR Group, page 37-3
• Configuring an AAR Group, page 37-4
• Deleting an AAR Group, page 37-4
• Related Topics, page 37-5
AAR Group Configuration Settings
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. The AAR group represents the dialing area where the line/directory number
(DN), the Cisco voice mail port, and the gateway are located.
For each AAR group, you enter the prefix digits that are used for automated alternate routing within the
AAR group, as well as the prefix digits used for automated alternate routing between a given AAR group
and other AAR groups. Devices, such as gateways, phones (by means of directory numbers), and trunks,
associate with AAR groups. If automated alternate routing of calls takes place, you may also associate
devices with an AAR calling search space.
Note For AAR to function, you must configure AAR groups and also ensure that the Automated Alternate
Routing Enable clusterwide service parameter is set to True. (The default value for this service
parameter specifies False.)
Refer to the “Understanding Route Plans” chapter of the Cisco Unified Communications Manager
System Guide for more information about automated alternate routing groups.