There are a lot of solutions for your problem but the simplest straight forward one would be a MCM 8zone GSM.
This is a normal 8 zone security system with built in GSM & is what I always use for sites with no landline. One advantage is being able to program daily/weekly test comms , one disadvantage is that they dont have dynamic battery testing , only static. ie doesn't monitor battery condition until the mains fails
Most commercial radio sites would have sub base band channels available for alarm telemetery
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