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  2. 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.

  3. Need to Make a Private Call? Here's How to Block Your Number

    www.aol.com/private-call-heres-block-number...

    Another way to make a private call is to step away from your phone app and download an app that provides you with a different phone number. A couple of apps you can use include Google Voice and ...

  4. 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 ...

  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. 1A2 Key Telephone System - Wikipedia

    en.wikipedia.org/wiki/1A2_Key_Telephone_System

    A user might have a set with just a few lines available, while the system attendant or receptionist might have a set wired for many more lines so that they could monitor the status of all lines simultaneously. Key telephone systems also supported manual buzzers, intercom lines (with or without selective ringing), music on hold, and other features.

  7. Intercept message - Wikipedia

    en.wikipedia.org/wiki/Intercept_message

    If a phone receiver is left off-hook, some phone systems may use an intercept message to inform callers to hang up their phone receivers. The most common message reads as follows: If you'd like to make a call, please hang up and try again. If you need help, hang up and then dial your operator. A formerly-used variation of this message was as ...

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