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  2. Message-waiting indicator - Wikipedia

    en.wikipedia.org/wiki/Message-waiting_indicator

    This feature is also frequently called (and abbreviated) as visual message waiting indicator (VMWI). A VMWI, as defined in Telcordia GR-1401-CORE, is a stored program controlled switching (SPCS) system feature that activates and deactivates a visual indicator on customer-premises equipment (CPE) to notify the customer that new messages are waiting.

  3. 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.

  4. 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 ...

  5. Line information database - Wikipedia

    en.wikipedia.org/wiki/Line_Information_DataBase

    In the US, caller ID name information is not transmitted from the originating office to the destination office. It is the terminating carrier that is responsible for providing the caller ID information to its customers. The carrier performs a database lookup using the caller's telephone number to obtain the name information for the caller ID ...

  6. 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.

  7. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    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 on busy *89 1189 Last-call return cancel *90 1190 Conditional forward: Busy line *92 1192 Conditional forward: No ...

  8. In the end, the lettered keys were dropped from most keypads and it was many years before the two symbol keys became widely used for vertical service codes such as *67 in the United States and Canada to suppress caller ID. Public payphones that accept credit cards use these additional codes to send the information from the magnetic strip.

  9. Ringing (telephony) - Wikipedia

    en.wikipedia.org/wiki/Ringing_(telephony)

    A magenta box in conjunction with an orange box (which emulates the caller ID signal to create falsified data) is called a vermilion box. The hardware also has multiple legitimate applications. While a telephone exchange includes a central source of ringing voltage at the switchboard, a private branch exchange or telephone-based intercom must ...