Note:
When you select the High Availability (HA) check box, the system with HA mode replicates and preserves complete signaling state for all active calls and registration information of endpoints on the standby box. In the event that the active box fails, the standby box can maintain the state of the active call so that all the features for that active call are available. The EMS server with HA mode maintains state information for calls on UDP transport only. In an event when a particular call leg uses TCP transport, EMS server with HA mode will be unavailable for that call. Avaya SBC then falls back to Media HA where only audio information is replicated.