Baseline Widely available
The read-only dtmf property on the RTCRtpSender interface returns a RTCDTMFSender object which can be used to send DTMF tones over the RTCPeerConnection. See Using DTMF for details on how to make use of the returned RTCDTMFSender object.
An RTCDTMFSender which can be used to send DTMF over the RTP session, or null if the track being carried by the RTP session or the RTCPeerConnection as a whole doesn't support DTMF.
Note: Only audio tracks can support DTMF, and typically only one audio track per RTCPeerConnection will have an associated RTCDTMFSender
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