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Also try switching the extender switch to data and diss the yellow blue,while I've Seen those extenders I've never come across one used for Alarm signalling so not sure if it would hold a line fail off
Your only other option was to programme the telephone number/s you want it to dial into the receiver tele number and put any 4 digit account number in other than 0000 and when the alarm activates it'll call the numbers 8 times and just beep at you. But best invest in a speach dialler that way you can acknowledge any activation message
As above you said you entered the phone number, that com device is not a dialler like a speech dialler so won't do what you want it to do
You will need to buy a stand alone dialler to connect to a trigger
If the phone line wasn't connected before you started it may be that the system has been hit by lightning so disconnected, you can check this by doing a continuety test with a multi meter check between phone line b terminal and earth (it may be a teminal and earth) if you get a reading of about 10 ohms or less the pcb is damaged