I Googled around and it looks like Telus has loaded a custom firmware on that modem/router combo which MANY people cannot get the ports to forward correctly.
http://www.google.ca/search?q=port+f...ient=firefox-a
My suggestion is to use your old dlink modem if you still have it or even better a Thompson SpeedTouch 516. Try this, take the device into any telus store and say that it overheats after 20 mins(HOT to the touch, not warm), they will surely replace it. Ask them for a Dlink or ST516, anything other than the Siemens crap. Then goto Future Shop and buy a real router like a Linksys WRT54G.