1

Create an FGDN group and add FGDNs administered in Session Manager.

Creating FGDN groups

2

Enable FGDN configuration for every Session Manager in the FGDN group.

Ensure that all instances of Session Manager in the FGDN group have heartbeat configuration.

Creating FGDN groups

3

Create a routing rule with an FGDN from the FGDN group as the next hop address.

Creating a routing rule for Call preservation

4

Add the routing rule to the trunk server flow.

Creating a routing rule for Call preservation

5

Change the interworking profile of Session Manager instances in the FGDN to set the Transaction Expire time to 4 seconds.

Creating a routing rule for Call preservation

6

Administer DNS SRV for FGDN routing in the DNS server.