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High Availability with Hot Standby in S-Series IP PBX

Understanding the Hot Standby in S-Series

Hot standby or redundancy is a redundant method in which one server runs simultaneously with an identical primary server. And all data is mirrored to the secondary server in real time. Upon failure of the primary server, the hot standby server immediately takes over, replacing the primary server.

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 S-Series PBX as a primary server, set another S-Series 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. When the on-site PBX is down, you could receive failover notification. S-Series PBX supports email, call and SMS notification.


Note: Hot standby feature is supported on S-Series firmware version or later.


The two servers in the failover pair must meet the following requirements:

  • Same model.
  • Same firmware version
  • Same expansion boards and modules¬†installed in the same slots
  • Same software configurations

Quick Start

  1. Verify the basic information of the two S-Series PBXs.
  2. Edit the PBX hostname to verify the two S-Series PBXs
  3. Set up hot standby service for the two PBXs.
  • Set IPPBX1 as a primary server.
  • Set IPPBX2 as a secondary server.
  • Reboot the two PBXs to make hot standby service take effect.
  1. Test hot standby service.

Download the Configuration Guide about details of how to configure hot standby on two S-Series PBXs.

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