Connected to computer modem and combination phone/answering machine. Printer is supposed to "listen" to all calls, allowing regular calls through to the answering machine but disabling the answering machine when it detects a fax transmition. Problem: it only does this about 10% of the time. Most faxes are treated as regular phone calls and ignored, at which time I get a "beeping" on my answering machine. When answering machine is turned off the machine performs as designed, allowing regular calls through to the phone and picking up the faxes. Question: since the installation diagram(s) shows only separate phone and answering machine attached to the printer and computer is my combination phone/answering system interfering/confusing the printer? Help would be greatly appreciated. Thanks...