After countless reviews of SRNDs over time, I am just looking for something that goes to current best practices on CUCM cluster sizing and the distribution of CUCM services like tftp, cti manager, moh, etc.
Discussions with peers and Cisco SE/CSEs (presales and TAC) have yielded alot of different opinions on this.
The presales process has procured 5 7845-H2 servers and licensing for 7000 IP Phone users for a centralized deployment for a distributed enterprise.
Other voice applications are VM (CUC) for the 7000 users and CC (UCCX) for 175 users.
There was no high level design outside of a Cisco BOM to utilize unspent budget so assume:
The high level design implies 1:1 redundancy though not stated.
The high level design implies scalability but does not state any growth count or growth trend.
The high level design does not characterize call volume.
How should the CUCM cluster designed and the services (tftp, cti manager, moh, etc) deployed (activated) as a low level design is being developed?
Opinions researched and debated seem to fall into three groups:
1) Dedicated Publisher node (one physical) + Dedicated 1:1 Subscriber nodes (two physical) + Dedicated 1:1 tftp/cti/moh nodes (two physical)
2) Dedicated Publisher node (one physical) + Two Non-dedicated 1:1 Subscriber/tftp/cti/moh nodes (four physical) with CallManager Groups creating two logical 1:1 groups to spread ~3500 users on each logical group.
3) Dedicated Publisher node (one physical) + Three Non-dedicated N:1 Subscriber/tftp/cti/moh nodes (three physical) with CallManager Groups creating three logical N:1 groups to spread ~2333 users on each logical group; the tftp/cti/moh would be backup + One Dedicated tftp/cti/moh node (one physical) the tftp/cti/moh would be primary.
Opinions or links?