With voicemail only, you can use Exchange 2003 on or off box. Exchange 2000 is only supported for upgrades from 4.x, not for new installations. With unified messaging, you can use Exchange 2000, 2003 or 2007, but it must be on a seperate server.
Yes, unified messaging requires a minimum of 2 servers. Voicemail only can be implemented with one server. Keep in mind that when using one server for all functions, you have no redundancy for Active Directory, Exchange, etc. This is certainly a workable solution, just something to be aware of.
Our current setup is a very peculiar one with Unity 4.0(3), Exchange 5.5, SQL all on one box but the AD is integrated with domain, Exchange is separate. With Unified Messaging I guess we have to upgrade & integrate Exchange with the domain Exchange ( which is 2003) I guess. So we can have the Unity 5.0 & Unified Messaging on one box while the message store should be the domain Exchange mailbox store. No doubt Exchange 5.5 must go. Is this tentative action plan feasible?
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
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