About Cisco Unified Communications Manager Group Setup
In Cisco Unified Communications Manager Administration, use the menu path to configure Cisco Unified Communications Manager groups.
A Cisco Unified Communications Manager Group specifies a prioritized list of up to three Cisco Unified Communications Managers. The first Cisco Unified Communications Manager in the list serves as the primary Cisco Unified Communications Manager for that group, and the other members of the group serve as secondary and tertiary (backup) Cisco Unified Communications Managers.
Each device pool has one Cisco Unified Communications Manager Group that is assigned to it. When a device registers, it attempts to connect to the primary (first) Cisco Unified Communications Manager in the group that is assigned to its device pool. If the primary Cisco Unified Communications Manager is not available, the device tries to connect to the next Cisco Unified Communications Manager that is listed in the group, and so on.
Cisco Unified Communications Manager Groups provide important features for your system:
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Redundancy—This feature enables you to designate a primary and backup Cisco Unified Communications Managers for each group.
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Call processing load balancing—This feature enables you to distribute the control of devices across multiple Cisco Unified Communications Managers.
For most systems, you need to have multiple groups, and you need to assign a single Cisco Unified Communications Manager to multiple groups to achieve better load distribution and redundancy.
Cisco Unified Communications Manager Group Configuration Considerations
Before configuring a Cisco Unified Communications Manager group, you must configure the Cisco Unified Communications Managers that you want to assign as members of that group.
After you have configured the Cisco Unified Communications Manager group, you can use it to configure device pools. Devices obtain their Cisco Unified Communications Manager Group list setting from the device pool to which they are assigned.