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  2. Automatic callback - Wikipedia

    en.wikipedia.org/wiki/Automatic_callback

    In telecommunications, an automatic callback is a computer telephony calling feature that permits a user, when encountering a busy condition or other condition where the called individual is unavailable, to instruct the system to retain the called number and to establish the call when there is an available line or when the called number is no longer busy.

  3. Ringback number - Wikipedia

    en.wikipedia.org/wiki/Ringback_number

    The test consists of calling a reverting calling telephone number (ringback number) or a vertical service code with a standard telephone. Upon answering the call, the exchange plays a unique signal tone as a signal for the installer to hangup the telephone. The exchange then places a reverting call to the originating line, causing the telephone ...

  4. Busy signal - Wikipedia

    en.wikipedia.org/wiki/Busy_signal

    An otherwise unspecified busy signal indicates that the called number is occupied: The called number is talking with another caller on the phone; The number is calling out; Someone else has called the number or is calling the number at the same time; The other line was left off-hook; It is otherwise unavailable

  5. Operator assistance - Wikipedia

    en.wikipedia.org/wiki/Operator_assistance

    A third number call or third party call is an operator assisted telephone call that can be billed to the party other than the calling and called party. The operator calls the third number for the party to accept the charges before the call can proceed. Time and charges was a service that could be requested of an operator before a call began ...

  6. Last-call return - Wikipedia

    en.wikipedia.org/wiki/Last-call_return

    Call again, a form of automatic ring back, allows a caller, on reaching a busy signal, to hang up, dial a special code, and be called back automatically when the called number is no longer busy, usually with a limit of 30 minutes. Call return allows a customer to dial a code that identifies the last incoming call. On some types of central ...

  7. Need to Make a Private Call? Here's How to Block Your Number

    www.aol.com/private-call-heres-block-number...

    Another way to make a private call is to step away from your phone app and download an app that provides you with a different phone number. A couple of apps you can use include Google Voice and ...

  8. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    In many cases, when calling from abroad, busy, reorder and other call failure tones may be played by the local switch. Modern signalling protocols like SS7 send this information digitally; thus only a ringback tone or announcement generated by a distant switch in a foreign network will ever be heard by callers from other countries or networks.

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

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

    So if your bank leaves a voicemail, don’t just call back the number from the missed call. Find the official number online and dial that, suggests Levin. “Never trust—always verify,” he says.