al-yeti

So basically the informa calls you when the alarm activates and works with the addition of a beep or extra tone in tandem with message I assume you tried deleting and recording new messages again? Incase that is corrupt somehow? I got confused because of title ie "not dialling"

side point is your new provider restricting your calls ie incoming only hence wont actually dial out to anything? so you might to check that

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

bell transformers have some exceptions but not off a 32 amp ring main mounted next to it lol, some transformers now made to fit directly into cu been around for a while tho

G2 are bit easier for home users I think, GD48 has advantage of telling you open zone in setting, but then g2 offers you the part and night set options for a home user a little better , rather than the gd with a and b key and using codes and extra tags for what you want G2-20 or g2-44 would do the job?

I wonder is DIY = Bodge