How to configure port forwarding on OnCell gateway?
Port forwarding settings are located in the Virtual Server Settings tab.
Port forwarding settings are located in the Virtual Server Settings tab.

Public Port: External Internet network port. Their values can be some of those applied by various COM port modes (950, 966, 4001, …).
Internal IP: Local host IP address, to which the traffic coming on the public port is to be redirected.
Internal Port: Internal port applied for work with a local network device.