The 787-331 exchange is serviced by the following companies within the GUAYNABO ratecenter.
"OPTIVON TELECOMMUNICATIONS SERVICES, INC. - PR"
Call are routed trough OCN 087D and CLLI - SNJNPR06CA0 (Common Language Location Identifier Code) and Point of Interface (POI) switch which is located in .
Who's number is 787-331 Numbers?