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Mechanoids - Dual Tone Multi-Frequency (DTMF)...
phone-dtmf-
About This Category
Facets of mechanical devices and automation; machines of all sorts (though mainly man-made) including robots and computers.You might like to visit 2001: A Space Odyssey (A Shrine), which includes tiny excerpts of HAL's famous utterances...
- phone = phones, telephone
- phone dtmf = Dual Tone Multi-Frequency (DTMF), TouchTone(TM), Touch-Tone(TM) = In-band successor/alternative to pulse (loop-disconnect, LD) dialing from handset to local exchange for wire-line telephones.
phone dtmf tone ... phone dtmf touchtone
phone dtmf tone ... (12)
phone dtmf touchtone ... (4)