Phantom calls from extensions

I have 169 extensions all ringing to one extension. sometimes a random extension will call in withour being asked to. the freepbx is on an internal network without being on the outside world. any ideas?

I think a good idea would be to provide a little more info on your system and setup.

  1. FreePBX version
  2. Distro or hand built
  3. Logs of the problem happening