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  2. Teleblock - Wikipedia

    en.wikipedia.org/wiki/Teleblock

    The patent describes a call blocking system as: The integration of various federally required and state mandated do-not-call lists for telemarketers into a system that automatically blocks outgoing calls from a number of companies ("Customer Companies") taking into account factors such as preexisting customers which may legally be contacted is ...

  3. Call blocking - Wikipedia

    en.wikipedia.org/wiki/Call_blocking

    Call blocking, also known as call block, call screening, or call rejection, allows a telephone subscriber to block incoming calls from specific telephone numbers. This feature may require an additional payment to the subscriber's telephone company or a third-party. Call blocking is desired by individuals who wish to block unwanted phone calls.

  4. How to stop robocalls on your flip phone - AOL

    www.aol.com/stop-robocalls-flip-phone-150002444.html

    An Alarming Spike In Scam Calls Coming From Robocalls. 4. Contact your carrier: Many carriers offer call-blocking services. Contact your carrier (e.g., Verizon, AT&T, T-Mobile) and ask if they ...

  5. Permanent signal - Wikipedia

    en.wikipedia.org/wiki/Permanent_signal

    In most mid-20th-century switching equipment, a permanent signal would tie up a junctor circuit, diminishing the ability of the switch to handle outgoing calls. When flooded cables or other conditions made this a real problem, switch staff would open the cable, or paper the off-normal contacts of the crossbar switch , or block the line relay ...

  6. Here are the best ways to block robocalls - AOL

    www.aol.com/news/2019-05-31-here-are-the-best...

    Allow phone companies to block unwanted calls to their customers by default. Permit phone companies to implement technology that would enable consumers to block calls not on their own contact list.

  7. 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 ...