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An N11 code ("N-one-one" code) or N11 number is a three-digit abbreviated dialing telephone number within the North American Numbering Plan (NANP) which allows access to specific services. Usage is listed in the NANP as follows: *2-1-1: Community services and information (ex: United Way of America) *3-1-1: Municipal government services, non-emergency number *4-1-1: Directory assistance *5-1-1: Traffic information or police non-emergency services *6-1-1: Telephone company (telco) customer service and repair *7-1-1: TDD and Relay Services for the Deaf and Hard of Hearing *8-1-1: Underground public utility location,〔See FCC Doc. (No. 92-105 )〕 in Canada 8-1-1 is assigned for non-emergency health information and services *9-1-1: Emergency services (police, fire, ambulance/rescue services) :(4-1-1 and 6-1-1 are commonly used within the U.S. but not officially assigned by the FCC) Each of these eight numbers is part of a NANP dial plan using NPAs (Area Codes) which prevent nearly 8,000,000 telephone numbers (from N11-NXX-0000 to N11-NXX-9999 excluding certain NXXs) from being assigned. ==Service== The assigned use of each N11 can vary for the various countries included in the NANP but 9-1-1 is mandated in the U.S. and Canada, while the availability of the other N11 codes varies by location. 7-1-1 and 9-1-1 access is mandated by law in the U.S., even within private networks (PBX, Enterprise and Cellular systems). Cellular services often cannot automatically provide a specific location of a caller using 9-1-1. 4-1-1 and 6-1-1 are supported by the service provider for the calling phone but not all carriers provide these services. 4-1-1 and 6-1-1 (formerly 8-1-1) are typically blocked within Enterprise or PBX systems (including Cellular service purchased for an Enterprise System) since generally, 4-1-1 calls incur a fee and the service is now readily accessible by other means and 6-1-1 services are managed by the Enterprise the phone resides in. Other community services are provided through 2-1-1, but only if a non-profit organization such as the United Way or the local government operates it locally. Likewise, local or state/provincial government may, but do not uniformly, operate traffic information using 5-1-1. 8-1-1 was made mandatory in the U.S. in 2007 however it has not been universally been implemented. 7-1-1 is funded through the TRS Fund which Telco Carriers are mandated to maintain to provide Relay Services for the Deaf and Hearing Impaired. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「N11 code」の詳細全文を読む スポンサード リンク
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