I reviewed everything here and was unable to find anything on this topic, but if it is posted already, I apologize. I received a 5504 unit for Christmas, and it has been working fine. Earlier this week something strange happened. WHen you call my house, the phone will ring once and then it sounds as if a fax machine comes on, and then the phone line disconnects for 60 seconds. At the same time, all the lights on my home alarm come on. 60 seconds later, the phone line is fine. It normally disconnects if you set off the alarm, but what is strange is why it's doing it now, when the alarm isn't armed? But what really confuses me is when I unplug the phoneline from Replay, everything works fine. Any ideas? Thanks in advance.