1. 
   DTMF
   (Dual Tone Multi Frequency) is the dialling signal that you generate when you press an ordinary telephone's keys. It is known as 'Touchtone' phone (formerly a registered trademark of AT&T). With DTMF, each key you press on your phone generates two tones of specific frequencies. So that a voice can't...
   Found op http://www.zoo.co.uk/~z0001325/Glossary.html
   
   
2. 
   DTMF
   Data Tone Multiple Frequency + Dual Tone Multifrequency
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   DTMF
   Dual Tone Multi Frequency. Tone signaling used by fixed phones to replace pulse dialling and by mobile phones and fixed phones to control VAS (value added services), such as information service access. DTMF is often called `Touch-Tone`.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
4. 
   DTMF
   Dual Tone Multifrequency. Signalling which is the basis of the operation of push-button telephone sets. Dialled numbers are transmitted as tones rather than electronic pulses.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
5. 
   DTMF
   Dual Tone Multi Frequency is the signal to the phone company generated when you press a telephone's touch keys. It's known as a 'Touchtone' phone. DTMF has generally replaced loop disconnect ('pulse') dialling. With DTMF, each key you press on your phone generates two tones of specific frequencies. ...
   Found op http://www.encyclo.co.uk/local/20632
   
   
6. 
   DTMF
   Dual Tone Multi Frequency
   Found op http://foldoc.org/DTMF
   
   
7. 
   dtmf
   1) Abbreviation for dial tone multi frequency
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/dtmf/1
   
   

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