Country Code: +503
International Call Prefix: 00
National Significant Numbers (NSN): seven or eight digits.
Format: +503 NXYZ MCDU where 'N' is the National Destination Code (NDC), and 'X', 'Y', 'Z', 'M', 'C', 'D', and 'U' stand for millions, hundred thousands, ten thousands, thousands, hundreds, tens, and units, respectively.