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Automatic number identification (ANI) [1] [2] is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes. Automatic number identification was originally created by the American Telephone and Telegraph Company (AT&T) for long distance service in the Bell System ...
In the early 1980s, Bell Labs received a patent for what became AT&T's "Advanced 800 Service", a computer-controlled system where any toll-free number could point to any destination number, such as to a small business local number instead of a special InWATS line, and an itemized bill generated only for the calls the business actually received.
CenturyLink grew as Century Telephone and later CenturyTel through acquiring many small and mid-size telephone companies. These include: CenturyTel of Chester, Inc. (Iowa, Minnesota) CenturyTel of Colorado, Inc. – formerly Universal Telephone; CenturyTel of Eagle, Inc. – formerly owned by Pacific Telecom
Toll-free telephone service is a telecommunication service in which subscribers are assigned telephone number in NPAs 800, 888, 877, 866, 855, 844, and 833. Calls to these numbers incur no toll charges for callers. The American Telephone & Telegraph Company (AT&T) first introduced 800 toll-free service in 1967. [2]
[4] [5] In practice, some RespOrgs do abuse the system by stockpiling millions of toll-free numbers for advertising purposes, because the enforcement of the regulations has been weak and sporadic. This situation has led to periodic creation of overlay plan toll-free area codes to prevent exhaustion of the SMS/800 available number pool.
The TNAS System is a database for co-ordination of allocation and porting of toll-free numbers and is used by nine carriers. [5] A client may switch service providers, or a service provider switch host carriers, without a change in the published toll-free number.
Many toll-free numbers are not available from cell phones (usually blocked by the cell phone provider rather than by the provider of the toll-free number, in an effort to prevent low-price competition from calling card providers). Some toll-free numbers are not available from phones listed by the owner of the number, including many payphones ...
An automatic number announcement circuit (ANAC) is a component of a central office of a telephone company that provides a service to installation and service technicians to determine the telephone number of a telephone line. The facility has a telephone number that may be called to listen to an automatic announcement that includes the caller's ...