Rob Huffman Sun, 07/12/2009 - 12:12
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Hi Nasry,


Servers within a Cluster do not need to match. So you can use a mix of 7825,7835,7845 models within the Cluster.



General Clustering Guidelines


The following guidelines apply to all Unified CM clusters:




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Note A cluster may contain a mix of server platforms, but all servers in the cluster must run the same Unified CM software release.



https://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/6x/callpros.html#wp1043559



Hope this helps!

Rob

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