I've already received a message from Vodafone to say they are withdrawing the 3G service in 2023, maybe I misunderstood, I figured if 3G was being withdrawn 2G would be before it?
Yes I agree professional monitoring is the true answer, but it's not financially viable, in the 45 years we have had involvement at the site there has never been a serious attempt to gain entry, however it's more for reassurance, the lady who owns the place is getting older (85+), in the past had the alarm gone off she would have gone out & let rip with both barrels of the 12 bore, these days that would be frowned upon.
I know the Premier can't handle IP, but the GSM gateways I've seen are standalone & only need to be triggered to send out SMS/Calls, if it can't handle multiple calls, I can get around that in Asterisk.