MetalMonkey
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And call alarm systems are officially not compatible with any form of digital voice( And digital voice adapters are specifically forbidden from being used to supply them) and the customers that have them are advised to call their call alarm company and get an upgrade at unit that works over 4g.
I think I'd rather have it on VoIP than 4g... They still haven't finished rolling out 3g around here, and they are already turning that off

Not sure how they will work it, but I wonder if dual path might be an option like intruder alarms?