The 920-992 exchange is serviced by the following companies within the RIO ratecenter.
CENTURYTEL SOUTHERN WISCONSIN LLC DBA CENTURYLINK
Call are routed trough OCN 931 and CLLI - RIO WIXARS0 (Common Language Location Identifier Code) and Point of Interface (POI) switch which is located in RIO.
Who's number is 920-992 Numbers?