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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. Best Phones for Hard of Hearing Users - AOL

   www.aol.com/best-phones-hard-hearing-users...

   For premium support please call: 800-290-4726 more ways to reach us. Sign in. ... caller ID, alert tones when the phone is off the hook, and digital clarity amplifiers to ensure crystal-clear ...

4. Vertical service code - Wikipedia

   en.wikipedia.org/wiki/Vertical_service_code

   On a touch tone telephone, the codes are usually initiated with the star key, resulting in the commonly used name star codes. On rotary dial telephones, the star is replaced by dialing 11 . In North American telephony , VSCs were developed by the American Telephone and Telegraph Company (AT&T) as Custom Local Area Signaling Services ( CLASS or ...

5. Timeline of the telephone - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_the_telephone

   1991: the GSM mobile phone network is started in Finland, with the first phone call in Tampere. [45] 1993: Telecom Relay Service available for the disabled; 1994: The IBM Simon becomes the first smartphone on the market. 1995: Caller ID implemented nationally in USA; 1999: creation of the Asterisk Private branch exchange

6. 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 ...

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

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

   Scammers “are adept at spoofing phone numbers for caller ID purposes,” he says. So just because a number shares your area code doesn’t mean the caller is from your town. Crooks purposely use ...