[erol]

If you have a fax and a phone on same phone line (single number) - then when someone rings that number it should be a case of who 'answers' the call first. If the fax answers it will start 'whining' and try and get a handshake tone from the calling fax. If you pick up the phone first the fax should not reply. There may be an option on the fax machine to set how many times the phone should ring before it picks up the call.

HTH