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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. 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. Anonymous call rejection - Wikipedia

   en.wikipedia.org/wiki/Anonymous_call_rejection

   In many voice telephone networks, anonymous call rejection (ACR) is a calling feature implemented in software on the network that automatically screens out calls from callers who have blocked their caller ID information. The caller usually hears a voice message explaining that their call cannot be connected unless they display their number.

5. *82 - Wikipedia

   en.wikipedia.org/wiki/*82

   This Vertical Service Code, *82, enables calling line identification regardless of subscriber preference, dialed to unblock withheld numbers (private callers) in the U.S. on a per-call basis. If Caller ID is subscribed to or enabled on the line receiving the call, the unblocked phone number and registered name is displayed – unable to ...

6. 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 ...

7. Call waiting - Wikipedia

   en.wikipedia.org/wiki/Call_waiting

   Call waiting deluxe is the Bellcore (now Telcordia Technologies) term for Type II caller ID with Disposition Options. [ 1 ] This CLASS -based POTS -telephone calling feature works by combining the services of call waiting with caller ID but also introduces an "options" feature that, in conjunction with certain screen-based telephones, or other ...