The GSM backup option is a cost effective way for a dialer alarm to send a signal to the Monitoring Centre receivers in the event that the primary communications line is not operating. 

Line failures can occur for a number of reasons such as a deliberate action or severe storm damage.  By utilizing the GSM backup option, the ability of the alarm system to communicate in the event of a main line fail is increased.  The alarm system monitors the main line for connectivity, and when it is lost, the GSM can take over, allowing the continuation of vital alarm signals to be sent to the Monitoring Centre.

For the GSM backup unit to work effectively, it must be installed in an area that has good GSM 2G or 3G mobile coverage. The system requires a SIM Card from a telecommunications company such as telstra, optus, vodafone etc to operate and is the responsibility of the customer to maintain.