I've done some rudimentary Googling and searching of the forums here to find out:

Does Spark/Openfire support group voice chat through the conference tools present in the client? I'm trying to get a voice chat network set up so that multiple machines can talk to each other. Is this possible or is voice chat only possible in a peer-to-peer, one-client-to-one-client setting? The voice chat works perfectly when connected in this fashion, but I can't seem to get any sort of group voice chat to function.

Is there a plug-in I need? Is there some setting I need to update in the admin console?