AT&T (7018) BGP clue sought

I'm trying to track down someone at AT&T that can answer questions about their implementation of BGP communities - questions that are not answered in their BGP policy document. Conversations with first and second line support people have not been productive. Any help that someone in a network engineering role could provide would be greatly appreciated.

jms

I take it you have looked at this document already?
http://www.onesc.net/communities/as7018/as7018.pdf