Configure a Cisco Unified CM Group
A Cisco Unified CM Group specifies a prioritized list of up to three Cisco Unified Communications Manager instances. The first Cisco Unified Communications Manager in the list acts as the primary Cisco Unified Communications Manager for the group. The other members of the group act as secondary and tertiary (backup) Cisco Unified Communications Manager instances.
While the BlackBerry Mobile Voice System does not automatically fail over to the secondary or tertiary Cisco Unified Communications Manager instances, you should consider having at least two subscriber servers configured for the BlackBerry MVS. You can use a previously created Cisco Unified CM Group as long as the Publisher/Subscriber you are directing the Telephony Connector to and registering the BlackBerry MVS Client instances with is listed in the Selected Cisco Unified Communications Managers drop-down list.