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ontonechange property of the
RTCDTMFSender interface is used to set the event handler for the
tonechange event, which is sent to the
RTCDTMFSender each time
a tone begins or ends. The event handler receives as input a single parameter of type
RTCDTMFToneChangeEvent, which describes the change.
RTCDTMFSender.ontonechange = toneChangeHandlerFunction;
A function which is called when a
tonechange event is sent to the
RTCDTMFSender, indicating that a DTMF tone has either started playing, or
if all tones have finished playing.
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