Well I reckon you should give Port Forwarding ago...
This is the instructions for your Modem/Router....
http://portforward.com/english/route...W/Limewire.htm
That link is for Westell VersaLink-327W
And this one is for Westell VersaLink 327W, I wasn't sure which one you had
http://portforward.com/english/route...W/Limewire.htm
You will know which one is yours as soon as you log into your Modem....