Vista Tutorial - How do I tell Microsoft Fax to automatically add a 1 prefix?

I'm setting up fax services on a win 2003 std server for a third party
application to send faxes. The problem is that the third party application
does not put a 1 in front of long distance numbers so the fax fails in
microsoft fax because the number is dialed without the 1.

How do set Microsoft fax to automatically add a 1 to all long distance
numbers? In the phone and modem options I see that I can do it for one area
code at a time but I need to do it for all area codes except our local area
code.

Example: the number comes in to MS Fax as 212-555-5555. I need Microsoft
fax to dial it as 1-212-555-5555.

Any help is appreciated.

Thanks,
Dave