Hah I had something similar except with the volume on. Managed to figure out it was a faulty line splitter where we split the phone and modem Turns out (at lea

Hah I had something similar except with the volume on. Managed to figure out it was a faulty line splitter where we split the phone and modem Turns out (at least here in the UK) if you repeatedly hit the hangup button it will dial emergency services and the splitter was doing the equivalent of that Very disconcerting as a new internet user to have the police tell you to stop calling them through the back of the computer under the desk