Avaya Contact Center – Extended Capacity provides High Availability (HA) and supports the active/alternate HA model. In case of failure, your contact center fails over to the alternate server in the data center. The alternate server becomes active and handles the contact center activity load. The failover must not impact active calls. The failover can cause minor data loss in call recording and CTI application messages and affect audio quality and announcement playback. If any other issues occur after the failover, you must review the log files to verify the cause of the issue.