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  2. Priority call - Wikipedia

    en.wikipedia.org/wiki/Priority_call

    Priority call, and priority ring also refer to calling features which give a distinctive ring to calls from telephone numbers chosen by the subscriber. The service may require a subscription from their telephone company. To set up priority call, the subscriber dials the vertical service code *61 and follows the instructions. [1] [2]

  3. Distinctive ring - Wikipedia

    en.wikipedia.org/wiki/Distinctive_ring

    Distinctive ring, marketed under a variety of names, is a service offered by a telephone company that establishes additional telephone numbers on the same line as an existing number, each number ringing with a distinctive ringing pattern. Typically, the original number rings with the standard ring pattern that is common to the nation where the ...

  4. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    An example of a P1 call would be an active armed offender, pursuit or an officer requiring immediate assistance. This is the least common priority used, as most urgent calls fall under the Priority 2 category. The KPI for attendance of P1's is 12 minutes. Priority 2 or P2 is an urgent emergency call with risks of serious injury or damage to ...

  5. 1A2 Key Telephone System - Wikipedia

    en.wikipedia.org/wiki/1A2_Key_Telephone_System

    The common-audible ringing signals from the KSU would run through the energized relays to certain phones that would also ring if there was a power failure. The phone lines that terminated at the KSU were also terminated at these relays and in the event of a power failure, the relays would de-energize and switch the phone lines to the ringers of ...

  6. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration. The use of vertical is a somewhat dated reference to older switching methods and the fact that these services can only be accessed by a telephone subscriber, going up ( vertically ) inside the local central office ...

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  8. Room 641A - Wikipedia

    en.wikipedia.org/wiki/Room_641A

    Room 641A is a telecommunication interception facility operated by AT&T for the U.S. National Security Agency, as part of its warrantless surveillance program as authorized by the Patriot Act. The facility commenced operations in 2003 and its purpose was publicly revealed by AT&T technician Mark Klein in 2006. [1] [2]

  9. Government Emergency Telecommunications Service - Wikipedia

    en.wikipedia.org/wiki/Government_Emergency...

    For cellular telephone users, a related capability is offered by the Nationwide Wireless Priority Service (WPS). WPS users have the ability to queue at the top for the next available communications channel to their registered base station in order to place their call by dialing * + 2 7 2 + [destination number] + send , greatly enhancing their ...

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