Deploying UM
For basic deployments, UM is surprisingly easy to deploy. In most environments, you need only a few basic objects, and a single server is sufficient. More complex environments might require a bit more work. This presumes that you have a functioning telephony environment set up so that PBX users can call one another, incoming calls from the PSTN are handled properly, and so on. A word of advice: if you have problems or shortcomings in your telephony system, it’s a good idea to stabilize (and, if possible, fix) them before beginning your Exchange UM deployment. You should also plan to deploy any IP PBXs or gateways you might need.
Sizing and scaling UM
Microsoft has not yet released any sizing or scaling guidance for Exchange 2013 UM. ...
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