Lots of people have asked me whether they can use Exchange 2007 Unified Messaging with Asterisk, the popular open-source PBX. The answer is “not really”, because Exchange (and Live Communications Server) use SIP over TCP, and Asterisk uses SIP over UDP. (Supposedly this was being fixed, but it looks like the work never got finished). However, a clever fellow has written instructions on how to use the SIP Express Router (SER) package to link LCS 2005 and Asterisk— I bet this would also work with Exchange 2007, and I plan to find out in the next couple of weeks.
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