Users have to be able to transfer voicemails between the Unity servers.
Current Unity Setup:
Voicemail only (Exchange on Unity server) - No Unified Messaging - No Domino.
1 (One) Unity Offbox message store with Failover (Main site)
4 (Four) remote sites with Unity voicemail only servers
Unity servers at each site are on separte domains as Domain controllers
Unity servers are on 4.0.5 and will be upgraded to 5.x when the new domain structure is created.
Digitial networking the Unity servers by bringing all the Unity servers into 1 (one) single domain
(Are there other options? VPIM seems to be a point to point solution)
Can the Main site Unity Offbox message store server be the ADS Global catalog server and every other Unity server be Domain controllers in the same domain?
Or should there be only 1 domain controller and all the other Unity servers at the remote sites have to be just member servers on the domain? If so, what would happen when the Domain controller is down?
Can the Offbox message store server be the exchange mailstore for the main site and all the remote site Unity servers at each site be the Exchange mailstore for their respective sites?
CM 6.x SRND - Unity chapter
Unity 5 Design guide
Unity 5 Networking guide
Are there other resources?
Greatly appreciate any input!