Log into the ConnectPort’s web interface.
Browse to Configuration --> Network --> IP Forwarding Settings:

Ensure that the option to Enable IP Routing (Forwarding) is ticked.
Tick the option to Enable Network Address Translation (NAT) and select mobile(0) as the public interface.
Add a new rule completing the protocol, port and internal IP address fields as required.
Once the rule has been added, click the Apply button.