I need to know how to set up the following:
A listing in AT&T 800 Directory Assistance (1-800-555-1212) that rings
to a Toll Free (800) number belonging to me -where I can direct the
call to the phone number of my choice. I know TelCan, Kall8, GotVMail
and others can give me an 800 number that I can redirect to another
phone number. But as far as I can see none of them can get my number
listed with 800 Directory Assistance in the US.

When I called AT&T they said that I can do this through my carrier. I
have not found a carrier that lets me do this without buying a
physical line - which I dont need.

This question is outside my areas of expertise, but I suspect that
finding an answer is likely to take much more work than most Google
Answers Researchers are willing to devote to a $2.00 question. If this
is important to you, I suggest that you increase the price
considerably.

I'm convinced that the answer is so simple that it will take a minute
to answer for the right person. But if no one answers at this price I
will raise the offer.