Xbox wont connect to zyxel router

[shellcls]

Hello,
I've just switched broadband providers and have been given a zyxel router. Got laptops set up ok but xbox won't connect. B/band provider says contact xbox, they say contact provider!! Can someone please help (answers in very simple terms) please

 

[Emerald]

how are you trying to connect your xbox to your zyxel?

does your xbox receive a IP?