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When I migrate email boxes from one exchange server to another the users stop getting voice mails and when they try to login to the voicemail it says the voice mail if offline. both of the exchange server are 2007. If I move the mailbox back to the original server it start working again. I am thinking it may have to do with security on the new exchange 2007 server, but have no idea what changes I need to make. I need to have both server running concurrently. . 
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When I migrate email boxes from one exchange server to another the users stop getting voice mails and when they try to login to the voicemail it says the voice mail if offline. both of the exchange server are 2007. If I move the mailbox back to the original server it start working again. I am thinking it may have to do with security on the new exchange 2007 server, but have no idea what changes I need to make. I need to have both server running concurrently. . 

Trouble with Cisco Voice Mail and Exchange 2007

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).