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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 ...
Code 959 with three or four additional digits is dedicated for access to office test lines in local exchange carrier and interoffice carrier central offices. The specifications define several test features for line conditions, such as quiet line and busy line, and test tones transmitted to callers.
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 .
In North America, the NANP uses the *70 star code prefix to suspend call waiting for a dialed call. A stutter dial tone confirms the de-activation. 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#
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 ...
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AT&T has an intercept message that is heard due to network congestion: "All circuits are busy now, please try your call again [TANDEM]". The number and digits at the end identify the network edge or Tandem switch the caller's local exchange company routed the call to.
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