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  2. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    A vertical service code (VSC) is a sequence of digits and the signals star (*) and pound/hash (#) dialed on a telephone keypad or rotary dial to access certain telephone service features. [1] Some vertical service codes require dialing of a telephone number after the code sequence.

  3. 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 ...

  4. Star 69 (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Star_69_(disambiguation)

    Star 69 refers to "last-call return," the Calling Feature Vertical service code *69 keyed on a landline telephone set in order to return the call of the last one to ring (in Canada and the United States). Star 69 may also refer to: Star 69 (band), an English rock band (1995–1997) *69, a 2018 studio album by Emily Blue

  5. 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.

  6. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    *82 and 1182 — releases Caller ID block on a call-by-call basis *87 — deactivates Anonymous Call Rejection Service; The four-digit numbers are not implemented in some areas. The star codes (*) are for use on Touch-Tone telephones, whereas the four-digit numbers prefixed 11xx are used on rotary dial telephones which cannot dial the * symbol.

  7. 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.

  8. Telephone number - Wikipedia

    en.wikipedia.org/wiki/Telephone_number

    Telephone numbers are sometimes prefixed with special services, such as vertical service codes, that contain signaling events other than numbers, most notably the star (*) and the number sign (#). [3] Vertical service codes enable or disable special telephony services either on a per-call basis, or for the station or telephone line until ...

  9. Call blocking - Wikipedia

    en.wikipedia.org/wiki/Call_blocking

    [1] [2] Such devices and services enable the user to block a call as it is in progress or alternatively block the number after the call is made. 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: