Check all phones to make sure all are hung up properly.
Make sure modem/fax line is disconnected.
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 no dial tone, call Mosaic. If there is dial tone, problem is with the inside wiring or jacks.