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  2. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    When a customer decides to use toll-free service, they assign a Responsible Organization (RespOrg) to own and maintain that number. The RespOrg can be either the IXC that is going to deliver the majority of the toll-free services or an independent RespOrg. [6] When a toll-free number is dialed, each digit is analyzed and processed by the LEC.

  3. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party, a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code. The specific service access varies by country.

  4. Toll-free number portability - Wikipedia

    en.wikipedia.org/wiki/Toll-free_number_portability

    The system was redesigned in 1981 to use a database, the SMS/800 service management system, which could direct any toll-free number to any destination based on various conditions; number prefixes remained tied to specific carriers until a RespOrg (responsible organization) structure was introduced in 1993 (US) and 1994 (Canada) to allow ...

  5. North American Numbering Plan expansion - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering...

    In NANP telephone number specifications, the letter N represents a numeral from 2 through 9, while the letter X represents any numeral. Thus, NXX is a number from 200 through 999, while XXXX is a range from 0000 through 9999. The first three digits of a telephone number are the numbering plan area code (NPA code, or simply NPA).

  6. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    not in use; available for toll-free assignment: Codes 880 through 882 were used (until 1 April 2004) to allow international customers to access toll-free numbers they otherwise could not by paying the international portion of the toll. 880 was paired with 800, 881 with 888, and 882 with 877. [21] 888: toll-free telephone service: March 1, 1996 ...

  7. 311 (telephone number) - Wikipedia

    en.wikipedia.org/wiki/311_(telephone_number)

    The first use of 3-1-1 for informational services was in Baltimore, Maryland, where the service commenced on 2 October 1996. [2] 3-1-1 is intended to connect callers to a call center that can be the same as the 9-1-1 call center, but with 3-1-1 calls assigned a secondary priority, answered only when no 9-1-1 calls are waiting.

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