Maybe the DSL router thing needs to be reset? our cable modem does sometimes when it's been out. It's got a reset button that's inside a pinhole that will reset it with a new IP and everything, and that will sometimes work if unplugging it and plugging it back in doesn't.
Haven't tried that. We've power cycled it several times over the last few days.
He called Centurytel this morning though, and they were "unsurprised" that the DSL didn't work. They've apparently got big network problems. They just didn't have an explanation why the phone works but not the DSL.