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2. Call centre - Wikipedia

   en.wikipedia.org/wiki/Call_centre

   A 1970 police call centre in Brierley Hill, England. A call centre (Commonwealth spelling) or call center (American spelling; see spelling differences) is a managed capability that can be centralised or remote that is used for receiving or transmitting a large volume of enquiries by telephone.

3. Automatic number announcement circuit - Wikipedia

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

   They are intended for use by phone company technicians, the ANAC system bypasses customer features, such as unlisted numbers, caller ID blocking, and outgoing call blocking. Installers of multi-line business services where outgoing calls from all lines display the company's main number on call display can use ANAC to identify a specific line in ...

4. Hotline - Wikipedia

   en.wikipedia.org/wiki/Hotline

   However, in common or colloquial usage, a "hotline" often refers to a call center reachable by dialing a standard telephone number, or sometimes the phone numbers themselves. This is especially the case with 24-hour, noncommercial numbers, such as police tip hotlines or suicide crisis hotlines , which are staffed around the clock and thereby ...

5. Call detail record - Wikipedia

   en.wikipedia.org/wiki/Call_detail_record

   A call detail record (CDR) is a data record produced by a telephone exchange or other telecommunications equipment that documents the details of a telephone call or other telecommunications transactions (e.g., text message) that passes through that facility or device. The record contains various attributes of the call, such as time, duration ...

6. Wide Area Telephone Service - Wikipedia

   en.wikipedia.org/wiki/Wide_Area_Telephone_Service

   A San Diego call center would be less fortunate; even with "band 6" (the most expensive lines), its national number would be unreachable to millions as California is a populous state and intrastate calls needed a separate toll-free number. The original InWATS system was supplanted by "Advanced 800 Service" in the 1980s. [10]

7. Public switched telephone network - Wikipedia

   en.wikipedia.org/wiki/Public_switched_telephone...

   The call is then transmitted from one end to another via telephone exchanges. The call is switched using a call set up protocol (usually ISUP) between the telephone exchanges under an overall routing strategy. The call is carried over the PSTN using a 64 kbit/s channel, originally designed by Bell Labs.