You said " Today, I have been running tests on the dialler and everything functions as it should"
But you also say its doesnt dial out on alarm?
So to me it sounds as if there is no dial tone on the informa or it isnt seeing the dial tone, i assume your phone is a standard phone? or is it an ip phone connected to the router? which might make sense why that wil still work, if thats the case what happens if you plug in a standard phone
might be wrong but inof didnt add up above unless i read it wrong