Can Unity VM support mulitiple Call Manager Clusters

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Nov 1st, 2007
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I have a 4.1.3 cluster that has Unified Messaging 4.0. Can I add a 5.1.3 Call Manager cluster and use the same Unity server? All the 4.1.3 users will migrate to 5.1.3 in the future.

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ruslewis Thu, 11/01/2007 - 16:20
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If you have done this before and have some good tricks to share please do.

I found the answer, finally, on Cisco and am posting it here in case someone else has the same question.

For Cisco Unified CallManager phone systems, note that Multiple Cisco Unified CallManager clusters

can be added to an existing Cisco Unified CallManager integration in UTIM by adding new clusters to

the integration. Because subscribers are associated with the integration and not with an individual

cluster, adding a cluster to an integration does not count against the maximum integration total. For

instructions on adding clusters to a Cisco Unified CallManager integration in UTIM, refer to the

“Creating an Integration with a Second Cluster of Cisco Unified CallManager” section in the applicable

Cisco Unified CallManager integration guide at



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