The device behind the router needs remote access software from inside to outside. I use TeamViewer for this. The router itself is only intended as a simple account point for the internet.

I found something interesting about Bing, but I can't test it myself at the moment.

From Bing
To set up port forwarding for the Huawei E5785-330 Mobile WiFi, you need to log into the device's web interface. To do this, open a browser and enter the IP address of the router in the address bar. By default, the IP address is **192.168.8.1**¹.

Log in using the login information printed on the sticker on the bottom of the machine¹.

In the web interface, navigate to **Settings > Security > Virtual Server**¹. Here you can configure port forwarding¹.

I hope this helps you!

Source: Conversation with Bing, 1.9.2023
(1) Huawei E5785 user manual (German - 308 pages). https://www.bedienungsanleitu.ng/huawei....
(2) Huawei E5785-330 Manuals | ManualsLib. https://www.manualslib.de/products....
(3) e5785-330 - Price comparison and reviews at Toppreise.ch. https://www.toppreise.ch/produktsuc....
(4) Huawei E5785-330 Mobile Hotspot - buy at digitec. https://www.digitec.ch/de/s1/product/huawei-e5785-330-mobiler-hotspot-router-21017730.
(5) Huawei E5785-330 - buy at digitec. https://www.digitec.ch/de/s1/product/huawei-e5785-330-router-20258661.

This little router is simple, and so are its basic functions. For more complex uses, it's better to turn to more professional devices.