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A structured representation of a phone number conforming to the international E.164 numbering plan format,requiring only the national_number field.
objectnational_numberrequiredstring^[0-9]{1,14}?$The national number, in its canonical international E.164 numbering plan format. The combined length of the country calling code (CC) and the national number must not be greater than 15 digits. The national number consists of a national destination code (NDC) and subscriber number (SN).