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  2. Call blocking - Wikipedia

    en.wikipedia.org/wiki/Call_blocking

    These devices rely on caller ID information and thus a phone blocker requires a caller ID service active on the line for blocking to function. Treatment of blocked calls may include: Sending the caller to voicemail; Sending the caller to busy signal; Sending the caller to "Number No Longer in Service" Sending the caller to "Keep Ringing"

  3. 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. Or ...

  4. 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.

  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. Calling Name Presentation - Wikipedia

    en.wikipedia.org/wiki/Calling_Name_Presentation

    In the US, the caller's name, or CNAM information, is not sent during a call. Rather, the terminating carrier is responsible for providing the Caller ID information to its customer. The terminating carrier performs a database lookup using the caller's phone number to obtain the name information to display with Caller ID.

  7. Caller ID spoofing - Wikipedia

    en.wikipedia.org/wiki/Caller_ID_spoofing

    Caller ID spoofing is a spoofing attack which causes the telephone network's Caller ID to indicate to the receiver of a call that the originator of the call is a station other than the true originating station. This can lead to a display showing a phone number different from that of the telephone from which the call was placed.

  8. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    Do not disturb *79 1179 Do not disturb disable *80 1180 Call blocking disable *81 1181 Priority call disable *82 1182 Caller ID (per call) *31#/1832 [11] 1470 *83 1183 Selective call forwarding disable *85 1185 Caller ID disable *86 1186 Continuous redial cancel *87 1187 Anonymous call rejection deactivation *88 1188 Deactivate call forwarding ...

  9. Truecaller - Wikipedia

    en.wikipedia.org/wiki/Truecaller

    Truecaller is a smartphone application that has features of caller ID, call-blocking, flash-messaging, call-recording (on Android up to version 8), chat and voice by using the Internet. It requires users to provide a standard cellular mobile number for registering with the service. The app is available for Android [1] and iOS. [2]