Question

 What is Dual Tone Multi Frequency (DTMF)?

Answer When you press the buttons on a touchtone phone, you're hearing DTMF.Each noise you hear is actually two distinct tones which represent a single number.If you press 1 then 2 then 3, you should hear... Read More »
http://answers.yahoo.com//question/index?qid=20100506011156AAMQD2A


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