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(Telecommunications) of or relating to a telephone dialling system in which each of the buttons pressed generates a tone of a different pitch, which is transmitted to the exchange
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


or touch′tone`,

a telephone dialing system using push buttons to generate ten tones of different pitch, each tone corresponding to a digit of a telephone number.
[1955–60, Amer.]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


[ˈtʌtʃtəʊn] ADJ (Telec) → digital, por tonos
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
References in periodicals archive ?
The new guidance also takes into account the fact that in recent years, enterprises have been increasingly using other new technologies--including dual-tone multi-frequency (DTMF) masking solutions, interactive voice response (IVR) systems, mid-call redirection, and web chat--to interact with customers and accept payments.
Previously, when customers called AT&T, they were able to use dual-tone multi-frequency (DTMF) or interactive voice response (IVR) to transact their business--whether it was to pay bills, upgrade service, or call with questions.
Sonus Networks said that the SBC 5000 series ensures regulatory compliance, secures the network border, delivers the essential transcoding of media and provides codec, dual-tone multi-frequency (DTMF) and fax interworking, it will also traverse intermediate network address translation (NAT) and firewalls and enforce quality of service policies.
H3G selected Sonus to secure the network border, enforce quality of service policies, traverse intermediate network address translation and firewalls, ensure regulatory compliance, deliver the essential transcoding of media and provide codec, dual-tone multi-frequency and fax interworking.
They can also be sent a direct request to enter their number using DTMF (dual-tone multi-frequency).
Advanced voice features support a variety of low bit rate and wideband speech coding schemes including G.711, G.722, G.726 and G.729ab, as well as dual-tone multi-frequency (DTMF) and dial tone detection/generation telephony algorithms without the need for an external digital digital signal processing device.

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