If I use the template for 2500 users, and my cluster with 9 cucm servers, with only 4 of them have callmanager service, does it mean that i can have 2500 x 4 = 10000 phones in my cluster?
I am wondering if we can deploy different capacity of cucm within a cluster, e.g. publisher and subscriber with call manager service deployed using 10000 users template, while those servers without callmanager service deployed using 2500 users template?
Technically, if you build no redundancy. Keep in mind that CUCM should be deployed either in 1:1 or 2:1 redundancy model which means for each call processing server there should be backup server or for 2 call processing servers there is 1 backup server. Also, the phone count is marketing term, 2500 phones would be supported if the server does nothing else which is never the case as you will have gateways, trunks, media resources, etc, etc so the count goes down fast. You can use the Cisco sizing tool described in SRND to size your cluster appropriately.
Technically you can use different OVA templates for different servers, but that is never recommended.
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