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| 编号方案区 | |||
| 编号计划区 | |||
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| 北美的长途电话编号方案区 | |||
| English thesaurus | |||
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| NPA (area code) | |||
| NPA (area code, Telephony) | |||
| NPA | |||
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numbering plan area : 10 phrases in 5 subjects |
| Business | 1 |
| Electronics | 5 |
| Information technology | 2 |
| Technology | 1 |
| Telecommunications | 1 |
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