There are however users that have had success sending/receiving faxes by doing all the following steps below although there are no promises it will work out for you:
1. Setting their fax machine to 9600 BAUD 2. Turning off their fax machine's Error Correction Mode (ECM) feature. 3. Adjusting the transmit/receive volume up or down as needed. The volume can adjusted by right mouse clicking on the GVJackApp traybar icon and selecting "Volume" from the menu that appears.