So you want to receive faxes in your email. And because exchange 2007 says it will work you want to make it happen. Wow the neat thing is exchange will handle T.38 inbound faxing real well. The problem is how do you make it work. There are a lot of discussions out there about this. And it does work well. The big issues with this is how the fax call makes it to exchange UM.

So generally there are 3 ways faxes can be setup for a user.

1. user has a separate fax number going or associated with his mailbox.
2. User uses the same number as his extension
3. Fax number goes to a resource mailbox and it is then distributed or viewed by other  users by attaching and viewing the mailbox.

Number 1 is probably the most common one and most widely used. Because number 2 the users phone rings and they pick it up and have to transfer it to their voice mail when they hear the fax tone. (this is cumbersome at best)

So generally when you setup number 1 you need to be sure that inband signaling is enabled on exchange. In SP1 it is turned off by default. to enable this find the globcfg.xml file located in  \Program Files\Microsoft\Exchange\bin Change the EnabledInbandFaxDetection setting to true and restart the UM services.

Once this is complete you should be able to send fax calls to exchange and it should detect the FAX tones.

there may be some PBX configuration that is needed it just depends on the PBX.

Hope this helps