Beetel 440 TX advanced configuration page is http://192.168.1.1/html/index1.html

Click the "Advanced" link.click on the link titled "Port Forwarding".If you get a message asking you to specify an ip address before proceeding, do this. Click on "LAN Clients -->Select LAN Connection should be LAN Group1 --> Under Enter IP Address, enter your own ip address.

Now on Port Forwading page select the "user" button and click on the "New".Under rule name you can give any name.
Under protocol select TCP,UDP.
Under "port start" enter the first port number you wish to open and "port end" specifies the ending port number. The "port map" should contain the same port number as what you entered in "port start".

Once this is done click on apply and go back to the previous page.
Now check the "user" button, you should now be able to see the newly created rule.
Select the rule, click on "Add" and click on "Apply".

Now on the top of the page click on "Tools", and then click on "System Commands"

On the page click on "Save All" and then click on "Restart". Your modem will reboot...thats it