Last week I discussed how to connect Asterisk with OCS Mediation Server over TCP. I figured since we can connect Asterisk to OCS, why not to Exchange UM. I will go over the configuration changes I made to Asterisk for this, but will not go into detail
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Read the complete post at http://blogs.technet.com/gclark/archive/2008/10/22/asterisk-1-6-0-exchange-2007-sp1-unified-messaging.aspx