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What is DTMF? |
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Dual-tone multi-frequency signaling (DTMF)
is used for telecommunication
signaling over
analog telephone lines in the voice-frequency band between telephonehandsets
and other communications devices and the switching
center. The version of DTMF that is used in push-button
telephones for
tone dialing is known as Touch-Tone,
was first used by AT&T in commerce as a registered trademark, and is
standardized by ITU-T Recommendation Q.23.
It is also known in the UK as MF4.
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Kits | ||||||||||||||
Ramsey TT7 Touch Tone Decoder
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