DSC Panels have a PGM output that can be programmed to active with Away arming. Also, our alarm systems call in an "Opening after Alarm" to let our central station know that it was a false alarm. If we do not get an Opening signal, then we call the location. If someone answers, they are asked for a passcode. If the wrong passcode is given, then we hang up and call up the police. Then we start calling down the call list for the account. Most of the time that is neighbors, relatives, and additional phone numbers for the owner. I've been installing security systems since 97. We take over a lot of ADT systems each year, and unfortunately we have to replace the main control panel and keypads. Anymore they are installing totally wireless junk, and that means we have to do a complete new install.