An action block that plays a DTMF tone.
If the proceed option is set to Immediately,
then the sound will be played without pausing the fiber.
If set to When complete, then the fiber will pause for the duration if it’s explicitly set,
Playback can be stopped (prematurely) by an Tone stop block.
- Proceed — when the fiber should proceed.
- Tone — tone to play.
- Audio source — playback audio stream, default is DTMF.
- Duration — duration of tone in seconds, default is tone length.