Lexmark CX923
Try one or more of the following:
From the home screen, touch Settings > Fax.
In the Fax Mode menu, select Analog.
You may have problems with your phone line.
Are your fax messages not going through? Make sure that your printer is connected to a working analog telephone service.
Having trouble sending a scanned card? Checking the recipient address or the connection can help you solve this problem.