Lexmark X5075 11N1522 User Manual

Connect one telephone cord into the LINE port   of the printer, and then plug it into an active telephone wall
jack.

Remove the protective plug from the EXT port 

 of the printer.

Connect a second telephone cord from the telephone to the answering machine.

Connect a third telephone cord from the answering machine to the EXT port 

 of the printer.

Connect the printer to a computer with a modem to send faxes from the software application.