You said you tried 2 different DSL modems? I assume same issue different equiment?

When you are using the internet does your phone work fine?

Do you have the DSL filters on you home phone lines?

If none of those things make it work, my solution to your issue is calling and get really really pissy with bellsouth and tell them fix my shit or else I am switching to something else.

Are you on the northside of Atl?