GSM Monitoring is the way to go here - it is reliable, can operate during a powercut (due to it being powered off your alarms battery) and also a bit harder to knock offline. That way also it is separate from your local network. Personally, I find that shoving a home alarm on a home network is not a smart idea as people do mess with them and could inadvertently disable your alarm. In a business it is a bit better as networks could go absolute years at a time without being touched and the fibre / phonelines in most cases are not as accessible to anyone with a bit of know-how.
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