I had this question from a university in the rocky mountain range. With Exchange Server 2007 unified messaging, the UM server can directly detect a fax tone using the T.38 FOIP (Fax Over IP) standard and route inbound faxes to an extension. It does
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Read the complete post at http://blogs.technet.com/ucedsg/archive/2008/09/05/how-does-faxing-work-with-exchange-unified-messaging.aspx