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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 ...
An automatic number announcement circuit (ANAC) is a component of a central office of a telephone company that provides a service to installation and service technicians to determine the telephone number of a telephone line. The facility has a telephone number that may be called to listen to an automatic announcement that includes the caller's ...
On most European telephone networks, and GSM or UMTS mobile phones, call waiting is activated by dialing the following codes: To activate: *43# To deactivate: #43# To check status: *#43# A voice announcement, tone or a message on your phone's screen will confirm the service status. Call waiting in Europe uses an "R" (recall) button on the phone.
If AT&T (T) has its way, your traditional landline phone (assuming you still have one) might be going the way of the dodo bird. On a recent conference call to investors, Chairman and CEO Randall ...
On more modern landline services, particularly those using VoIP, ACR is sometimes activated and deactivated using a Web interface, rather than by dialling codes. On traditional landlines in the North American Numbering Plan , the feature is enabled with the vertical service code *77 , and disabled with *87 .
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As we become more mobile and have unlimited or high-minute cell phone plans, the traditional landline has given up its role as our connection to friends and become instead a connection to our ...
AT&T divided the United States and Canada into numbering plan areas (NPAs), and assigned to each NPA a unique three-digit prefix, the numbering plan area code, which became known in short-form as NPA code or simply area code. The area code is prefixed to each telephone number issued in its service area.