Caller ID: FAXHALT
They have used other numbers with the same prefix 770-449-XXXX and change the last 4 digits. I did not answer, and there was no message left, but others who have answered (with different last 4 digits) have claimed to hear a fax machine "beep". Some have had their fax numbers called with no fax coming through. FAXHALT claims to be a company that stops unwanted faxes, and offers to put you on a "do not fax" list, if you give them your fax number. I didn't think unwanted faxes was such an issue!