I think that happened to some people who were accepted by jefferson -- No phone call but snail mail. Haven't heard the same for Vanderbilt though.
Quite a lot of people called Vanderbilt and apparently their decisions were made as of Oct 15. Some have to wait a few more weeks before decisions are made.
I interviewed at Vandy in the first few days in September and was complete there weeks before that. And, I am not even up for committee review for a few days still. I think the final review process is kind of random. Just hang in there!