Hi,
Although it is a consumer product. But the following steps are provided as a courtesy to help you solve the problem.
Click Network Settings > NAT.
Click Port Forwarding.
Click Add new rule to forward more ports.
Choose or enter the following settings for your game system.
Service Name: Insert anything here
WAN Interface: LTE
Start Port: Enter port number
End Port: Enter port number
Translation Ports: Leave blank
Server IP Address: IP address of device you want to forward to
Protocol: TCP or UDP
https://www.sasktel.com/images/support/23863-add-new-rule2-20180329.png
Click Apply.
I hope it helps.