I wonder if the SilverSurfer port or the Modem could cause such behaviour?... They work as they should on accessing the internet, though.. :-?
Time to check your STFax settings, to make sure you're sending it to the correct modem device (mine's serial.device, if you use silversurfer, it would be different), baud rate etc is all correct.
Do you have the Init string set up correctly for your modem?
Are your timeouts correct (default seeting is usually best).
It's always worth double checking your settings
