Dual Tone Multi-Frequency (DTMF) is a method of instructing a telephone switching system to dial telephone numbers, or to issue commands to switching systems or related telephony equipment. It reliably sends the data across long distances. The DTMF system uses eight different frequency signals transmitted in pairs to represent sixteen different numbers, symbols and letters. Frequencies (of the generated'''....Read More
November 2, 2016 10:32 am

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