I install;ed a MICS with just two lines and 4 phones. Sometimes when an incoming call is picked up the caller hears a modem tone then the call drops. I have installed a bunch of these over the years but this is a first.
Check if the the Alarm is on line one and move it to a lower line and notify the alarm company which line.
Some alarm systems are programmed to answer (with modem) the next call right after another.
To dial in they call the number, hang up and call back right away.
Either someone is calling your MICS from a modem and dialling the wrong number of perhaps the MICS got a RAD that is answering the call on a particular line.
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