Conference Bridge Meet me Full

I have a conference bridge that I host on Xeon 3.0 server with 4 gig of ram.
Freepbx 2.8 (Elastix).

The bridge works fine until I get about 25 - 30 callers then bridges starts saying bridge full.(Meetme Full) I have more than enough bandwith 20meg pipe.

I also have the room set to unlimited callers with no call recording.