DTMF | Ferncast Knowledge Base

Option	Description
Number of channels	Information field: Shows the number of currently used channels.
Sampling rate	Information field: Shows the current sample rate of the input.
Data vailable	Information field: Shows whether the audio source currently receives data.
Reset Pipe to waiting	Toggles behavior in case of no incoming audio data. ON: The PIPE is set into waiting state until incoming data is detected at which point the PIPE becomes active. OFF: The PIPE is stopped (turned off) if there is no incoming data after a short grace period.
Override display name	Changes the name by which this audio source element is displayed in the PIPEs list (instead of DTMF). Note that this is separate and distinct to the PIPE's name. Example: Naming it “Channel 1,2” to see which input channels are used.
Passthrough	Toggles whether incoming audio is decoded upon entering the system. ON: Incoming audio is not decoded. On the output side, untouched audio is delivered. OFF: Incoming audio is decoded (and transcoded before leaving the system). Note that this option requires a license. See here for details.
Timestamp smoothing	Toggles whether timestamps should be restamped if they do not match system time. On: Turns timestamp smoothing on. Off: Turns timestamp smoothing off.
Tones to play	Sets a specific sequence of DTMF signals to play when the PIPE is turned on.

!	Triggering DTMF signals on demand.
	With the PIPE alone, only a single sequence of DTMF signals can be played, which are configured under the option Tones to play. Playing specific signals as needed requires both an active PIPE with a DTMF source element and the DTMF widget.