First, we should add a link to the spec in RTCDTMFSender.idl https://www.w3.org/TR/webrtc/#rtcdtmfsender
The following API's currently only appear in Blink and WebKit, but not in Gecko or the spec (linked above):
canInsertDTMF
duration
interToneGap
track
So, should we standardize or remove them?
Comment 1 by guidou@chromium.org
, Feb 28 2017