Sharp FO-4400 - Manual (Page 16)

Connections
14
Connecting the telephone line cord
Insert one end of the line cord into the jack on the back of the machine
marked TEL. LINE. Insert the other end into a standard (RJ11C) single-line
wall telephone jack.
Note: The fax machine is set for touch-tone dialing. If you are on a pulse dial
(rotary) line, you must set the fax machine for pulse dialing by changing Option
Setting 22. See page 107.
Connecting a telephone (optional)
If desired, you can connect a telephone to the TEL. SET jack on the back of
the machine.