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Voice and StandardsJoin now to read essay Voice and StandardsRotary vs. Dual Tone Multi-Frequency Dialing (DTMF)Dual Tone Multi-Frequency (DTMF), also called “Touch tone”, was first introduced in 1963 by AT&T as a means for the central office to set up calls at a faster rate. Its roots are traced back to the 1950s when AT&T.
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