On the com2400 module on top right corner of pcb. This depends on a 2400 module being fitted.
If unsure then post photo of pcb.
PSTN telephone lines are being turned off by 2025 ? and your and your analogue phone line will no longer work.
What are you connecting telephone line for ?
I think what they they are getting at .."is it can be connected to the comm2400 it works like a gprs phone line ….we have a few connected like this ( guardtec 593/595 ) as you get the full fast format pins ….
+ & - aux power on pcb
In {white wire} to Bell trigger output will give you intruder signal.
You can wire as dial capture,but you will need com 2400 module.
CSL app or monitoring station?