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DTMF (Call Super Remix | Telephones
Buy MT8870 DTMF Telephone Voice Module at an affordable price - Direnc.net®
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MP3 Audio Shield with DTMF Support | Sandbox Electronics
How to make DTMF Phone Call Control Home Appliance Using Arduino and GSM Module | GSM DTMF Project - YouTube
GitHub - bert2/DtmfDetection: C# implementation of the Goertzel algorithm for DTMF tone (a.k.a. Touch-Tone) detection and localization in audio data. Includes wrappers and extensions for NAudio.