Log in to the EMS web interface with administrator credentials.
From the Device menu, click the SBC name to administer.
In the navigation pane, click Services > SIP servers.
Click the server profile for the Session Manager in the FGDN group.
Click the Heartbeat tab.
Select the Enable Heartbeat check box and provide appropriate values in the Method, Frequency, From URI, and To URI fields.
For the Call preservation feature to work, you must enable heartbeat for all Session Manager instances in the FGDN group.
Click the Advanced tab.
Click Edit.
Select the Enable FGDN check box.
Optional If Session Manager is configured for ports other than the default ports,type appropriate port numbers in the TCP Failover Port and the TLS Failover Port fields.
