How do I make my tivo talk to my new router

I have a a Sony SVR2000 (first generation Tivo, that is) with lifetime service. It also has a cache card. I switched to a new router, and now my Tivo can't call in. Everything's plugged in properly, as far as I can tell, but the Tivo just can't find the "phone" connection.



Any ideas what I need to change to fix it?....