How do you stop an inactive DSC home security system from beeping randomly?

I bought a house about 2 years ago with a DSC home security system installed by the provious owner. I have never activated the service. When I first moved in, the system keypad would randomly beep 2x until someone pressed any keys on the pad. It stopped for a while and has started beeping randomly again, but... show more I bought a house about 2 years ago with a DSC home security system installed by the provious owner. I have never activated the service. When I first moved in, the system keypad would randomly beep 2x until someone pressed any keys on the pad. It stopped for a while and has started beeping randomly again, but more frequently. It seems to go off a few times throughout the day, not at any regular intervals, but annoying enough to want to rip it out of the wall (which may be my next step). Again, pressing some of the keys seems to satisfy it for a short time. There are no manuals or instructions for the system and nothing on the pad to provide any advice.
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