Just set up my wifes MF733cdw and now any incoming phone calls are disconnected anywhere from 15-60 seconds into the call since the fax unit thinks its an incoming fax. The party at the other end hears the fax "beeps". The fax portion of the unit is set to answering machine mode as instructed. The answering machine has about 4 seconds of "dead air" before the greeting. This is an unlivable situation if I can't get a solution quickly. The unit will be going back. It recieves faxes fine and outgoing calls are not disrupted.
