HP 4200 series - Manual (Page 145)

user guide
fax setup
135
fa
x setup
5 Press the Answer Mode button on the front panel until TEL appears on the
display.
6 If your PC modem’s software is set to automatically receive faxes to your
computer, turn off that setting.
Caution! If you do not turn off the auto fax receive setting in your
modem software, your HP Officejet will not be able to receive
faxes.
how to answer fax calls manually
You must be available to respond in person to incoming fax calls, or your
HP Officejet cannot receive faxes. For information about how to receive fax calls
manually from your attached phone and from an extension phone, see
send a
fax manually from a telephone on page 43.