3 - On the same cmd window type now this: netstat -a - n and press enter to let it run, it may take 1-2-3 mins to complete the table. Then manually check the list and check your IP: port you want to check in this case (yourip:16000 and check that it says UDP on left corner, your IP can be something like: 192.168.xxx.xxx being xxx a value between 000 and 255), if it's in the list and listed as UDP make sure what does it say under state columm (it can be something like STABLISHED, LISTENNING, WAITING, REFUSED, etc) and let me know which one you get (if it's listenning or connected it's fine). If your IP:Port it's not listed there it simply means your port 16000 is not forwarded in your router.
After this go back to Voobly to check if it works, if it doesn't let me know