We have an OfficeServ 7200 system, and several of my users are reported that they have started hearing beeps randomly during calls. They say they hear a beep followed by a lighter beep, and it repeats every 30 seconds or so for a while and then stops. The customer on the other end does not hear the beeps.

I have no idea where to start looking for this. We really don't use much of the capability of the system.