Key pulsing

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In telecommunication, a key pulsing (pulsing) is a system of sending telephone calling signals in which the digits are transmitted by operation of a pushbutton key set.

The type of key pulsing commonly used by users and PBX operators is dual-tone multifrequency signaling. Each pushbutton causes generation of a unique pair of tones. In military systems, pushbuttons are also provided for additional signals, such as precedence.

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