Batboard

I'm trying to find a schematic and info on the 6-wire headset jacks that are found on the Cetracom consoles. I realize that it might be hard to describe, but I'm looking for info on what the 3 sleeves on each connector are. I have an interface box that I'd like to use to interface to a Plantronics 6 wire headset/amplifier, but it seems like there must be some power on this thing somewhere and I'm at a loss to figure it out.

Any help would be most appreciated.