2012 list of "Center" radio channels - obtained via the CARMAchicago list
RCAG = remote radio site - (all listings seem to be shown as RCAG, unless the site is physically located right at the ARTCC location, in which case it is listed as ARTCC)
Discrete = ??? - Discreet ???
First two entrys seem to be Center + sector/region/area - and this further broken down to individual airports and RCAG sites