Tag Archives :DTMF

Press PTT and then dial your DTMF number. 0~9 -> DTMF dial number 0~9. Menu -> A Up -> B Down -> C Exit -> D * -> E # -> F  ...

DTMF is the abbreviation of Dual Tone Multi-Frequency, that is, dual-tone multi-frequency. It refers to the sound or tone that the phone makes when pressing a number, where each key has two tones of a specific frequency, which are then transmitted over the voice channel.  ...