I am setting up a used Partner system, ACS, and Partner VS 4.1, and I am getting a ringing on extensions 10 and 11 on Intercom 2 button every 30 minutes. I cannot find if there is a notification or alarm set and I want to avoid resetting the whole thing. Also when the intercom is picked up - sometimes it appears to be dialing something. It definately appears to be associated with time - since it seems to happen every 30 minutes.