http://blogs.technet.com/markga/archive/2008/09/08/how-does-faxing-work-with-exchange-unified-messaging.aspxI 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 doesen-USCommunityServer 2.1 SP1 (Build: 61025.2)