hmmm... so your setup is a westell modem with port forwarding AND a router with port forwarding?  Ugh.  If that's the case, can you change your setup for a moment, remove your router from the mix, and connect directly to your modem. 

I found this http://www.voip.com/help/Residential/Installation/Networking/westell_port_fwd.aspx and it seems to contain some basic info (including the ip that modem can typically be found on 192.168.1.1).  The problem may be that your router has the exact same IP, so you can't properly forward.

You'll want to have a static IP setup if you have not done so already.  That might be your entire problem (I don't know, but you didn't mention static ip... more info at www.portfoward.com).  If you already have that configured, then go change your network config as described and see if you can log into your modem and what settings are there.  I'm not entirely sure what your options will be though... if both your router and your modem as accessible via the same IP... hmm. 

Do you have the option to only connect through the westell (I'm not familiar with it... does it have ethernet ports... wireless, etc)... just not sure what your network looks like.

Make sure that you are removing the "http://" bit when you are punching an IP into a browser.

Your router should have a page that tells you its status.  On that page look for something along the lines of "domain name server".  That ought to be where your router is connecting to, in this case your modem.  If you enter that IP as an URL, it should allow you to log in to your modem.  Once in there, look to see if anything might prevent those ports from being opened.  If there is a NAT tab, that should be all you need to mess with.  In here look to see if there is any way to loosen the NAT (do NOT turn it off), or forward ports.  The port you want to forward to can be found on your router status page.  Look for the IP address of the routers internet port.  That is the IP you want to forward to in your modem.  Hope this helps.  Just don't touch anything you are not sure of.

Connect to your modem in the way I described.  You can connect your computer directly to your modem, but it is not necessary.  For future refence, you can you type "ipconfig /all" in CMD without the "" to see your what your computer is connected to.

Okay Ineverdie, I found what you were talking about and enabled a NAT for Demigod with start 6073 and end 6200... It's also asking for a base host port... What should I put in there?

Glad to hear you got your ports open.  As far as people still being unable to connect, it may be that the problem is on their end.  I have noticed that sometimes two people simply will not connect to each other but they can connect to every one else.  I am not really sure what is causing it though.