Just checked - the phone IS model 7A1110. Thanks for your advice - it has been hugely helpful. We just located an old computer way in the back of a seldom-used maintenance room. Sure enough, it has the Rapid software on it. The config file on the computer has a bell schedule, but strangely enough it is an old schedule that hasn't been used in our building for years. So....not quite sure what's driving the current bell schedule....the mystery continues. Thanks again for your help.