TeleZapper

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 phone company to indicate a line has been disconnected. ^[1]

2 relations: Call screening, Special information tones.

Call screening

Call screening is the process of evaluating the characteristics of a telephone call before deciding how or whether to answer it.

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Special information tones

In telephony, a special information tone (SIT) is an in-band international standard signal consisting of three rising tones indicating a call has failed.

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References

[1] https://en.wikipedia.org/wiki/TeleZapper

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