[Freeswitch-users] How to do a "bridging" conference

Hi I am looking for a way to have a single conference distributed over multiple Freeswitch servers. For example callers 1, 2 and 3 use a conference on Freeswitch server A, and callers 4, 5 and 6 use a conference on Freeswitch server B. These servers mix the local audio individually and only share a single audio channel between them. Is this what a "bridging" conference does? If not, what is it for? Also how could I efficiently make a large listen-only "conference" where there is only ever 1 talker, with very many listeners distributed over lots of servers? Thank you Damjan