Hot Standby

The Hot Standby solution offers you the ability to provide high system availability, helping to prevent the unnecessary business loss caused by unexpected server failure.

You can set one PBX as a primary server, set another PBX as a secondary server. The hot-standby server (secondary server) can automatically and instantly take over if the primary server goes down. Callers still reach the people they need and business can continue as usual.


The primary server and secondary server in the failover pair must meet the following requirements:

  • Same model
  • Same firmware version

What is the Virtual IP address for?

  • Virtual IP address is a shared IP for the two PBXs. The virtual IP always point to the on-site PBX.
  • You should use the virtual IP address as server IP address when registering extensions in the local network.