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What is DTMF (dual tone multi-frequency) and how does it work?
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But also increased the redial and allocated # # function.
1 pcs New Version Pulse to Dual Tone Multi-Frequency DTMF Converter Enhanced
DTMF, Dual Tone Multi Frequency, MT8870DE DTMF Decoder
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Pulse-to-Dual-Tone Multi-Frequency DTMF Converter Standard Edition Old Dial Phone/Pulse-to-Dual-Tone Module
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