tone dialler

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Silent call — A silent call is a telephone call that is generated by a predictive dialer (or dialler) which does not have an immediately available to handle the call. In this instance the call may be terminated by the dialler, and the called party receives a… … Wikipedia
Hayes command set — The Hayes command set is a specific command language originally developed for the Hayes Smartmodem 300 baud modem in 1981. The command set consists of a series of short text strings which combine together to produce complete commands for… … Wikipedia
dial — n. & v. n. 1 the face of a clock or watch, marked to show the hours etc. 2 a similar flat plate marked with a scale for measuring weight, volume, pressure, consumption, etc., indicated by a pointer. 3 a movable disc on a telephone, with finger… … Useful english dictionary

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