TY FODAOyou must open your Router doors, that's all.
Download this program : http://www.simpleportforwarding.com/download
then select your router/modem, put the doors
2300-2400 TCP
2300-2400 UDP
28800-29000 TCP
47624 TCP
After adding those doors click in UPDATE ROUTER and that's all.
btw you must add your login, usually it's name:admin , pass: admin
in the IP you must add your local IP. Search it in the prompt, typ "ipconfig" and look for something like 192... or 10.1.1x
gl