3 ms·

This isn't DTMF. It's a form of MFSK like DTMF, but it operates on different frequencies and uses six tones at once vs DTMF's two.

• nomel 2y ago
  Then I would be very curious to see if this works with aggressive vocoders, like some VOIP use internationally.
  • Gracana 2y ago
    I would love to hear that recording, haha.