I'll bet the 1000 won't work. I've got one, too, and I've tried it on every DSL connection I've had (four), and it only ever worked on the one it was shipped with, and they were all on the same line. The 1000s were the very first DSL modems that came out, I believe, and I think that the supporting technology has changed enough that it's now obsolete.

I could easily be wrong, though.