A link to microsoft\'s instructions on setting the built in fax to dial the local area code (e.g. \"10 digit dialing\").
The gist:
Configure the dialing rules in the modem settings of control panel. Then make sure contacts are in the format of:
+Country/RegionCode (AreaCode) SubscriberNumber
For example, this is the format for a subscriber in the United States of America in canonical format:
+1 (nnn) nnn-nnnn
http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q318575