I'm having the same issue. If I understood the install correctly, the Fusion service is using the center four pins on the connector to the wall. In a usual DSL filter situation, doesn't the adapter filter out two of the pins allowing one signal to go to the telephone, and one signal to go tot he DSL? If that is the case and my Fusion service is essentially two DSL lines coming in on both sets of center pins, wouldn't I be "filtering out" one of my fusion lines making is plain old DSL again. So far I have confirmed that I do get a dial tone if I unplug the modem from the wall and replace it with the POTS (plain old telephone service - no electricity needed) phone I have. I have thus far just left my phone unplugged to try to get he most of my Fusion service planning only to use the Sonic phone line if the power goes out, or internet goes down, but it would be nice to have the functionality of it all the time.