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The TeleZapper is an appliance that plugs into a consumer telephone line. On detecting a ring and answer of any phone on the line, the Telezapper will immediately play a sequence of Special information tones or "SIT": one of eight internationally standardized signals that indicate a call cannot be completed. Typically the "Intercept" or "IC ...
The TeleZapper is a device designed to reduce the number of telemarketing-related phone calls a household receives by imitating the tone signal normally played by a ...
The interval between the segments of SITs is between 0 and 4 ms.To minimize the number of callers who may abandon the call without listening to the announcement, the nominal time gap between the third tone segment and the beginning of the announcement is set as close to zero as possible, with an allowed maximum of 100 ms.
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Call screening is the process of evaluating the characteristics of a telephone call before deciding how or whether to answer it. [1]Some methods may include: listening to the message being recorded on an answering machine or voice mail.
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