Failover gateway is displaying as mandatory in Trunk > Edit trunk.

Steps - 

1. Login as admin.
2. go to Carrier > Trunk
3. create a trunk without select any gateway in failover gateway options.
4. now edit above created trunk and observe failover trunk option.  

Actual result :- Failover gateway is displaying as mandatory. it automatically default selected in failover gateway option.

Expected result :- It should not be select automatically in trunk.

For reference as per client concern :- https://forum.astppbilling.org/t/required-failover-gateway-v5/1053/4  

See screenshot :-