RTCDTMFSender
The RTCDTMFSender
interface provides a mechanism for transmitting DTMF codes on a WebRTC RTCPeerConnection
. You gain access to the connection's RTCDTMFSender
through the RTCRtpSender.dtmf
property on the audio track you wish to send DTMF with.
The primary purpose for WebRTC's DTMF support is to allow WebRTC-based communication clients to be connected to a public-switched telephone network (PSTN) or other legacy telephone service, including extant voice over IP (VoIP) services. For that reason, DTMF can't be used between two WebRTC-based devices, because there is no mechanism provided by WebRTC for receiving DTMF codes.
Instance properties
RTCDTMFSender.toneBuffer
Read only-
A string which contains the list of DTMF tones currently in the queue to be transmitted (tones which have already been played are no longer included in the string). See
toneBuffer
for details on the format of the tone buffer.
Instance methods
RTCDTMFSender.insertDTMF()
-
Given a string describing a set of DTMF codes and, optionally, the duration of and inter-tone gap between the tones,
insertDTMF()
starts sending the specified tones. CallinginsertDTMF()
replaces any already-pending tones from thetoneBuffer
. You can abort sending queued tones by specifying an empty string (""
) as the set of tones to play.
Events
Listen to these events using addEventListener()
or by assigning an event listener to the oneventname
property of this interface.
tonechange
-
The
tonechange
event is sent to theRTCDTMFSender
instance's event handler to indicate that a tone has either started or stopped playing.
Example
See the article Using DTMF with WebRTC for a full example.
Specifications
Specification |
---|
WebRTC: Real-Time Communication in Browsers # rtcdtmfsender |
Browser compatibility
BCD tables only load in the browser