When setting up and filtering your systems for ASDL....BE AWARE that even fairly recent Alarms with telephone connection (ADT, etc) may well NOT have built in filtering.

SO, by contact at Area Manager level today for my Alarm company, I confirmed that a less than three years old system isn't inherently ASDL ready!!!!

Since the alarm connection to the phone line is usually hidden (to slow down intruder turn off), and often "alarm triggering" on disconnect, it might also be prudent to be careful if playing with connections!!??