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  2. Ringback number - Wikipedia

    en.wikipedia.org/wiki/Ringback_number

    A ringback number is a telephone number for a telephone line that automatically calls the line that the call was placed from, after the caller has hung up. The typical use of this facility is by telephone company technicians for testing a new installation or for trouble-shooting.

  3. Automatic ring back - Wikipedia

    en.wikipedia.org/wiki/Automatic_ring_back

    Automatic ring back is a service offered by phone companies.. On making a telephone call to a number that is engaged, automatic ring back is a service provided by the telephone company whereby, when the called number becomes available, the caller is rung back, usually with a distinctive "ring back" ring.

  4. Ringback - Wikipedia

    en.wikipedia.org/wiki/Ringback

    Ringback may refer to: Ringback, the ringing signal in telephony used to recall an operator or customer; Ringing tone, also ringback tone, the audible ringing that is heard by the calling party after dialing; Ringback number, a number used by phone companies to test whether a telephone line and phone number is working

  5. Ringing tone - Wikipedia

    en.wikipedia.org/wiki/Ringing_tone

    Ringing tone is often also called ringback tone. However, in formal telecommunication specifications that originate in the Bell System in North America, ringback has a different definition. It is a signal used to recall either an operator or a customer at the originating end of an established telephone call. [2]

  6. 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 ...

  7. This is why you should never call back an unknown number - AOL

    www.aol.com/article/lifestyle/2019/05/03/this-is...

    Find the official number online and dial that, suggests Levin. “Never trust—always verify,” he says. Watch out for these other phone call scams that could steal your money .

  8. Ringing (telephony) - Wikipedia

    en.wikipedia.org/wiki/Ringing_(telephony)

    In contrast to ring forward, the ringback signal is originated from the receiving or called end of a trunk line during an established connection, to recall the originating operator. [1] The signal is also sent by a coin line operator to recall a customer at a pay station after the customer hangs up, for example to inform the customer of time ...

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