Customer integration with existing system/database?

Can some people tell me how they have done customer integration into the RT
We have quite a bit of users and would prefere to use something that
connects into an existing
windows directory (maybe using tacacs or the exchange global address book
etc.) so that
we don’t have to manually enter all the users into the system by hand.

Also, Ive been able to create a custom field for “users” (ie- department)
but it does not show
up under the owner or more preferable “requestor” field. Is there a way to
link custom fields
to all users (priv and non priv) so it would show the department for the
requestor or any other custom field
in the “ticket metadata” section?

T.J. Maciak

Internet/Intranet Developer
Department of IT
City of Grand Rapids
P: (616)456-3713
F: (616)456-3448