Alarm auto dialler not calling

[wsoppitt]

Hi, I installed a challenger alarm system(probably mistake No.1) in a domestic property and the system included an auto voice dialler.
The entire system works fine except from the auto dialler.. It doesnt call the programmed phone numbers when the alarm is triggered, but as soon as you enter the user code to turn the alarm off it starts ringing..

Any ideas what this could be? Checked all connections and they are as shown on the wiring diagram

Chris,
I've tried to fit the challenger 10 system today. The bellbox keeps ringing after the cover fitted and tamper switch made. Did you have any problems?
Would the fact that the main panel isn't connected to the mains or to the internal battery when I connected up the bellbox cause it to sound?