My fax machine and phone are on the same line and when the phone rings, they both ring. Is there a device that can tell which are phone calls and which are faxes so that only the right machine for the message rings?
Unfortunately at the ringing stage, both phone calls and incoming faxes appear to be exactly the same, so there's no possible way to separate the two. You can only tell if it's a fax from hearing the beeping noise after picking up.