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New Member

Multi Cluster Best Practices

I have been asked to supply supporting documentation to build a case for load balancing between two CUCM clusters. I recently found out that new sites are being added to the cluster that has over 1000 locations while the 2nd cluster has just over 600. Can anyone assist with any supporting views?


Thank you!

Cisco Employee

Hi,Apart from exposing a


Apart from exposing a smaller number of phones / applications to failure if a server / service goes down on one cluster, there are a few specific features available in multiple cluster scenarios which are beneficial.

The Cisco Extension Mobility Cross Cluster feature allows an enterprise user of one Cisco Unified Communications Manager cluster (the home cluster) to log in to a Cisco Unified IP Phone of another Cisco Unified Communications Manager cluster (the visiting cluster) during travel as if the user is using the IP phone at the home office.

Further, you can use Session Manager Edition, details of the same are available here

I am sure there are other benefits as well and others are welcome to add to this post.




New Member

Manish, thank you for your

Manish, thank you for your contribution. I hadn't even considered the mobility cross cluster feature.