The Fail-over feature in 3CX allows you to create a standby replica of your PBX. In the event that
your PBX fails, your replica PBX becomes active minimizing downtime and data loss. Follow the
required steps below to activate this functionality.
3CX uses an active – passive approach using built-in configuration replication with a maximum
off set of 24h. The active host processes calls and presence information, while the passive host
monitors the active host.
In case of a failure of the active host (independent of application, OS or
hardware failure), the passive host stops its monitoring role and takes over as the active host. The
passive host’s configuration determines in which state the active host is declared failed in order
to initiate the fail-over switch.