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Wiretapping, also known as wire tapping or telephone tapping, is the monitoring of telephone and Internet-based conversations by a third party, often by covert means.The wire tap received its name because, historically, the monitoring connection was an actual electrical tap on an analog telephone or telegraph line.
If a call comes in for a number on the target phone a "conference bridge" is created and the second leg is sent to law enforcement at the place of their choosing. By law this must be outside of the phone company. This prevents law enforcement from being inside the phone company and possibly illegally tapping other phones.
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Computer-assisted language learning (CALL), known as computer-aided instruction (CAI) in British English and computer-aided language instruction (CALI) in American English, [1] Levy (1997: p. 1) briefly defines it as "the exploration and study of computer applications in language teaching and learning."
Call originator - (or calling party, caller or A-party) a person or device that initiates a telephone call by dialling a telephone number. Call waiting - a system that notifies a caller of another incoming telephone call by sounding a sound in the earpiece. Called party - (or callee or B-party) Caller; Calling party; Conference call (multi ...
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Countersurveillance refers to measures that are usually undertaken by the public to prevent surveillance, [1] including covert surveillance.Countersurveillance may include electronic methods such as technical surveillance counter-measures, which is the process of detecting surveillance devices.