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2. 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 ...

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. 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.

5. AOL Dialer: Fix common problems - AOL Help

   help.aol.com/articles/aol-dialer-fix-common-problems

   1. Check or uncheck, “I have to dial this number to turn off call waiting.” 2. Confirm the proper code is listed. For most telephone services, this code is *70. Note: If your connection problems persist, try removing the checkmark for call waiting. Dialing *70 can prevent the call from completing when the phone line does not have the call ...

6. 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 ...

7. 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.