The 509-523 exchange is serviced by the following companies within the ROSALIA ratecenter.
FRONTIER COMMUNICATIONS NORTHWEST INC. - WA
Call are routed trough OCN 4324 and CLLI - ROSLWAXARS3 (Common Language Location Identifier Code) and Point of Interface (POI) switch which is located in ROSALIA.
Who's number is 509-523 Numbers?