Does one have to have " 2 separate phone lines to receive faxes at home?"? - send test fax my machine

I explained to a Lexmark X63 printer and the manual that you are in 3 different levels, of which one can receive the "answer / fax messages and faxes simutaneously but when he tried to set this business to send fax from somewhere else should go and when I got home and checked my number on my cell phone screen of the fax, said: "Press 9, twice on the phone or start to receive faxes. What is the problem? You must choose the answer / fax, but if my phone is on another level, the "Phone" mode, press the manual 9 is a call or a fax machine that has twice in the start which meant that he was here to receive faxes. What is the problem and how to fix this problem? Thanks