Cisco Cisco Unified Contact Center Enterprise 9.0(2) Leaflet

Unified CM clusters utilize various types of servers, depending on the scale, performance, and 
redundancy required. They range from non-redundant, single-processor servers to highly redundant, 
multi-processor servers.

Unified CM is supported only on specific hardware platforms. For a list of the currently supported 
hardware configurations, refer to the documentation on Cisco MCS 7800 Series Unified CM appliances, 
available at 

For the latest information on supported platforms, models, and specific hardware configurations, refer 
to the online documentation at 

In order to size a Unified CM deployment, you must use the Cisco Unified CM Capacity Tool or the 
Unified Communications Sizing Tool, which indicate the number of Unified CM servers needed for each 
type of platform.

A Unified CM deployment with only one single Unified CM subscriber should be avoided for 
mission-critical contact center deployments and for deployments with more than 150 agents. 

 

lists the maximum number of agents in a system where only one Unified CM subscriber server is 
deployed, with the Unified CM publisher used as backup.

The Cisco MCS-7815 and MCS-7816 servers are not supported with Unified CCE deployments, but lab 
or demo setups can use these servers. They are, however, a supported Unified CM platform for 
Cisco Unified Communications deployments only. 

With Unified CM, you can choose from the following two redundancy schemes: 

2:1—For every two primary subscribers, there is one shared backup subscriber. 

1:1—For every primary subscriber, there is a backup subscriber. 

Due to the higher phone usage in contact centers and the increased downtime required during upgrades, 
the 2:1 redundancy scheme is not recommended for Unified CM deployments with Unified CCE.

 illustrates these two options. This illustration only shows call processing subscribers and 

does not show publisher, TFTP, music on hold (MoH), or other servers. For details on additional cluster 
deployment and redundancy options, refer to the latest version of the Cisco Unified Communications 
Solution Reference Network Design (SRND) Guide, available at 

MCS-7825

100

MCS-7835 or MCS-7845

150