FD142 is a 4-port E1/T1/BRI interface and 2 Ethernet port failover appliance. It can better protect the unpredictable problems happen to the Asterisk PBX. It will provide an effective way to backup the Asterisk PBX when undesirable changes are detected (often when Asterisk fails or power-off of the system).
FD142 provides a reliable and flexible solution to Asterisk PBX.
FD142 is controlled through an Asterisk loadable module res_failover.so. This module keeps sending “running” signal to redundant server when Asterisk is running. Once Asterisk is down or system power is cut off, the module will not be able to send out the “running” signal to FD142 and thus it will automatically switch to the redundant server.