Probably a DSC...but just guessing on that.
Tell P1 that you want them to default the master code/installer code, they can do this remotely but may charge you a few bucks. They should do this without a problem after you send them your 30 day cancellation letter before you move out - because they should deprogam the reporting portion of programming anyway. You definitely want to start the process BEFORE your phone line to the system is disconnected.