I am in the process of turning my AHP into a security system.
I purchased a RadioShack emergency dialer (49-1005). I then opened it up and on the back of the circuit board is clearly labeled the contacts for arm and disarm. I then soldered a 10 foot phone wire to the arm contacts (yellow and green wires), and then the red and black wires to the disarm contacts. Then connected the yellow and green wires to an X10 universal module, then the red and black wires to another universal module. I then set the house code and unit code to match my outside flood lights. (this unit sets off an alarm internally and flashes lights on and off for 4 minutes, and dials the numbers that are programmed in it playing a pre-recorded message, and I can listen into what is happening in the house after I answer my cell phone)
I then set up a smart macro that when triggered sets Flag 16 to true after flashing the garage light 2 times, this indicates the alarm is armed. (I trigger this macro from a keychain remote button 1 on, button 1 off then clears this flag and activates the universal module to disarm the radioshack dialer and flashes the garage lights 1 long flash.)
Then I set up smart macros to all of my motion sensors so that if Flag 16 is set then turn on the universal module connected to the radio shack dialer, thus setting off the alarm and starting the dial process.
I then set 3 powerhorns to the same code as the dialer and my outside flood lights. After the dialer starts flashing the outside lights 3 or 4 times the powerhorns start to scream and continue until the dialer stops flashing the lights.
This process is still in the experimental phase, but seems to work.
With motion sensiors all through the house any movement when the 'alarm' is armed will trigger the sirens and the autodial process.