Xerox : Troubleshooting : Fax Problems
Fax Problems
If your printer cannot send and receive faxes, ensure that the printer is connected to an approved analog telephone line. The fax machine cannot send or receive faxes when it is connected directly to a digital telephone line without the use of an analog filter.
Note:If the fax connection is poor, transmit the fax at a lower rate. For the Starting Rate, select Forced (4800 bps).