Dual-tone multi-frequency
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  Subject Replies Date
Which device will be suitable to convert the text message to voice signal? 0 12/30/2013
Could the DTMF act as a device of converting the text message to voice signal? 0 12/30/2013
What is DTMF means? 0 12/30/2013
Is it possible to increase the intervals between tones will ringing 0 10/14/2013
 
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