• Unplug all phones and equipment from the phone jacks, one at a time until problem clears.
  • Equipment includes fax, computer, caller ID, satellite dish receiver, cordless phone and answering machine.
  • Test line by connecting directly to the telephone demarcation point (demarc) located where the telephone line enters the premise (“little gray phone box” usually found on outside of house). A flat head screwdriver will allow you to open the front cover of the demarc to access the TEST JACK. Plug a known working phone into the test jack. If problem persists, call Mosaic. If problem goes away, it could be your inside wiring or jacks.