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A vertical service code ( VSC) is a sequence of digits and the signals star (*) and pound/hash (#) dialed on a telephone keypad or rotary dial to access certain telephone service features. [ 1] Some vertical service codes require dialing of a telephone number after the code sequence. On a touch tone telephone, the codes are usually initiated ...
Malicious caller identification. Malicious caller identification, introduced in 1992 as Call Trace, [ 1] is activated by the vertical service code *57 ("star fifty-seven"), and is an upcharge fee subscription service offered by telephone company providers which, when dialed immediately after a malicious call, records metadata for police follow-up.
Caller ID. 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. The caller ID service may include the transmission of a name associated ...
*57 and 1157 — used to trace harassing, threatening, abusive, obscene, etc. phone calls, and keep results of trace at phone company *66 and 1166 — to keep retrying a busy-line (see also Called-party camp-on) *67 and 1167 — Caller ID Block *69 and 1169 — Call Return (caller may press '1' to return call after hearing number)
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T-Mobile is the third-largest wireless carrier in the United States, after Verizonand AT&T, with 31.43% of the market share as of June 13, 2024. [7] The company was founded in 1994 by John W. Stantonof the Western Wireless Corporationas VoiceStream Wireless.
Anonymous call rejection. In many voice telephone networks, anonymous call rejection ( ACR) is a calling feature implemented in software on the network that automatically screens out calls from callers who have blocked their caller ID information. The caller usually hears a voice message explaining that their call cannot be connected unless ...
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 ...
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