We are considering an architecture that would remote the Unity Unified Messaging server from both the call manager server, exchange 2000 message store, and users (both their PCs running VMO and their IP Phones) in order to centralize administration. I've seen a reference to 40 msec max RTT between Unity & Exchange, but can't find anything between Unity and the users or Unity and the Call Manager servers and gateways. What design rule applies to the placement of these several servers and users?
Actually beginning with the 4.0(3) release it is not supported to have Unity connecting to Exchange (or DC/GC/DNS) via a WAN link because it has just too many problems. I can't stress enough how catastrophic the effect on Unity are when it monitors any Exchange server connected over a WAN link. That design guide on CCO is going to be replaced with a new version any day now and will reflect that WAN links are not supported anymore.
It is supported to have Unity across a WAN from CallManager. Basically each Unity port is the same as an IP phone with a single line appearance and can be provisioned the same. Note however that Unity will not register with an SRST router line an IP phone will.
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