Usage in places where there is no land line: It allows the Intruder Alarm Panel to make a call to the user or send information to the alarm receiving center over the GSM line.

Usage in places where there is land line: It works as a backup of the land line connected to the Intruder Alarm Panel.

It activates when the land line is interrupted and enables users to be called over the GSM line or continues to send information to alarm receiving center over the GSM network.