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2. Caller ID - Wikipedia

   en.wikipedia.org/wiki/Caller_ID

   Caller-ID system response sounds in various cases: analog, ISDN and digital PBX Caller identification (Caller ID) is a telephone service, available in analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.

3. Automatic number identification - Wikipedia

   en.wikipedia.org/wiki/Automatic_number...

   ANI is conceptually and technically different from caller ID service. [1] A caller's telephone number and line type are captured by ANI service even if caller ID blocking is activated. The destination telephone company switching office can relay the originating telephone number to ANI delivery services subscribers.

4. City ID - Wikipedia

   en.wikipedia.org/wiki/City_ID

   City ID logo. City ID is Cequint's first-generation caller mobile identification service. City ID displays the city and state or country associated with the caller's telephone number. In partnership with mobile network operators, the City ID service is available on many devices from Alltel, AT&T, [1] U.S. Cellular, and Verizon Wireless. [2]

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

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

   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.

6. Vertical service code - Wikipedia

   en.wikipedia.org/wiki/Vertical_service_code

   As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration. The use of vertical is a somewhat dated reference to older switching methods and the fact that these services can only be accessed by a telephone subscriber, going up ( vertically ) inside the local central office ...

7. Automatic number announcement circuit - Wikipedia

   en.wikipedia.org/wiki/Automatic_number...

   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 ...