We have 100s of ade stuff out there.
i like the scantronic ion but we don’t use them.
on takeovers they seem a good panel.
we mainly use risco but I’m not keen on the new stuff.
the gardtec panel were very reliable but disco stuff fails a bit too much for my liking
Probably the cradle off hook, could readdress it to another phone on the system and see if it rings when you call that number.
Only using the two address lines- check they are the right way round maybe