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Anchor text: NANP Administration System
Anchor text: Split of 503 (Oregon) Numbering Plan Area (NPA)
Anchor text: ''Planning Letter 456''
Anchor text: Split of 503 (Oregon) Numbering Plan Area (NPA)
Anchor text: Concentrated Overlay of 503 Numbering Plan Area (NPA) with 971 NPA
Anchor text: Permissive Dialing Extended for the 503/971 Concentrated Overlay (Oregon)
Anchor text: Expansion of the Concentrated NPA 971 Overlay with NPA 503 (Oregon)