Connecting two or more Jabber Servers

This is probably a redundant question, but when you don’‘t know the “jargons” used in XMMP/Jabber world, it isn’'t so straight forward.

In short, we want a network of jabber servers, each running independently, with their own rooms, etc, but we also want to create a common shared set of conference rooms among all the servers.

I guess, that means that there must be one server that owns the conference room and allow the others to “network” with that room.

Thanks in Advance