Alarm Dialer with Mobile Backup
The M60 Alarm dialer is a commercial Alarm Dialer designed for critical applications. The M60 has the facility to monitor a connected PSTN land line, if that land line fails it will automatically switch to the Mobile phone GSM network.
The M60 also has the optional ability to send SMS messages. This can be used as a secondary backup device as you can fit a second SIM card from a different network. I.e. you can send voice messages across network A and SMS across network B. Meaning even if one network is busy you can still use the other network to send your alarm message.
The M60 can also be connected just to the GSM network if no PSTN line is available.