AD Trusts and Openfire

So I’m curious about something.

At my site we have open fire running and authenticating to one AD Domain via LDAP, but we have 2 other domains, we want to be able to use Openfire with. Do we have to setup individual servers and setup a S2S?

All 3 domains have a trust relationship between them, so our users can technically authenticate from wherever they are, Is it possible for Openfire to handle this via LDAP as well?

Any ideas would be greatly appreciated…

Not sure if this will be the same thing, but we have a parent/child AD structure and what I ended up doing was creating a group in one of the domains and adding the users of the other domains to that ‘master’ group. Then I point OpenFire to that group.