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  2. 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: Sending the caller ...

  3. *82 - Wikipedia

    en.wikipedia.org/wiki/*82

    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 determine that the caller subscribes to outgoing callerID blocking or that *82 has been dialed to temporarily override that subscription. *82 can be dialed from U.S. land-line house phones and ...

  4. Teleblock - Wikipedia

    en.wikipedia.org/wiki/Teleblock

    TeleBlock [1] is a software program that automatically screens and blocks outbound calls against available federal, state, wireless, third party, and in-house Do-Not-Call (DNC) lists. Designed for use in telemarketing and outbound call centers, TeleBlock is applied to a subscriber's telephone carrier, provided voice lines, or delivered through ...

  5. National Do Not Call Registry - Wikipedia

    en.wikipedia.org/wiki/National_Do_Not_Call_Registry

    The law established the FTC's National Do Not Call Registry in order to facilitate compliance with the Telephone Consumer Protection Act of 1991. [2] A guide by FTC addresses a number of cases. [3] Registration for the Do-Not-Call list began on June 27, 2003, and enforcement started on October 1, 2003.

  6. Do not call list - Wikipedia

    en.wikipedia.org/wiki/Do_not_call_list

    A do not call list or do not call registry is a list of personal phone numbers that are off-limits to telemarketers in some countries. Do not call lists may also be held privately by a company, listing numbers that they will not call.

  7. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    Call waiting disable *71 1171 Usage sensitive three-way call *72 1172 Unconditional forward: All calls *73 1173 Call forward: Cancel *74 1174 Speed calling (8 numbers) *75 1175 Speed calling (30 numbers) *77 1177 Anonymous call rejection activation *78 1178 Do not disturb *79 1179 Do not disturb disable *80 1180 Call blocking disable *81 1181 ...

  8. Automatic number announcement circuit - Wikipedia

    en.wikipedia.org/wiki/Automatic_number...

    Automatic number announcement systems are based on automatic number identification. 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 ...

  9. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    When dialing a telephone number, the area code may have to be preceded by a trunk prefix or national access code for domestic calls, and for international calls by the international access code and country code. Area codes are often quoted by including the national access code. For example, a number in London may be listed as 020 7946 0321.