Kindly can anyone pls guide with how to achieve NAT settings in Freeswitch

Scenario
------------

Local PC (Bria) <-------------> FS Server (192.168.1.199)
(192.168.1.91)

Remote Iphone (Bria) <-------------> Internet <-------------> Router (Port Fwd) <-------------> FS Server 

Router is on dynamic ip - Domain - myhome.ddns.net

ISSUE - cannot register remote extension

Also, the same scenario works well with freepbx and asterisk (port forwards are ok)

Inline image 1

Thank You
Best Regards,
Chirag A.