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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]
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 ...
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 ...
417 Unknown Resource-Priority There was a resource-priority option tag, but no Resource-Priority header. [10] 420 Bad Extension Bad SIP Protocol Extension used, not understood by the server. [1]: §21.4.15 421 Extension Required The server needs a specific extension not listed in the Supported header. [1]: §21.4.16 422 Session Interval Too Small
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 ...
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]
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A user could select any available telephone line by pressing the appropriate pickup key and taking the handset off-hook. While on a telephone call, a user could place the call on hold by pressing the hold button, which also released the depressed line button mechanically, enabling the user to select another line for placing a call.