Web/API/RTCDTMFSender/insertDTMF

The insertDTMF() method on the RTCDTMFSender interface starts sending DTMF tones to the remote peer over the RTCPeerConnection. Sending of the tones is performed asynchronously, with tonechange events sent to the RTCDTMFSender every time a tone starts or ends.

As long as the connection is active, you can send tones at any time. Calling insertDTMF() will append the specified tones to the end of the current tone buffer, so that those tones play after the previously-enqueued tones.

Syntax

RTCDTMFSender.insertDTMF(tones[, duration[, interToneGap]]);

Parameters

tones: A DOMString containing the DTMF codes to be transmitted to the recipient. Specifying an empty string as the tones parameter clears the tone buffer, aborting any currently queued tones. A "," character inserts a two second delay.
duration Optional: The amount of time, in milliseconds, that each DTMF tone should last. This value must be between 40 ms and 6000 ms (6 seconds), inclusive. The default is 100 ms.
interToneGap Optional: The length of time, in milliseconds, to wait between tones. The browser will enforce a minimum value of 30 ms (that is, if you specify a lower value, 30 ms will be used instead); the default is 70 ms.

Return value

undefined

Exceptions

InvalidStateError: The DTMF tones couldn't be sent because the track has been stopped, or is in a read-only or inactive state.
InvalidCharacterError: One or more of the characters in tones is not valid DTMF.

Example

tbd

Specifications

Specification	Status	Comment
WebRTC 1.0: Real-time Communication Between BrowsersThe definition of 'RTCDTMFSender.insertDTMF()' in that specification.	Candidate Recommendation

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`insertDTMF`	Chrome Full support 27	Edge Full support ≤79	Firefox Full support 52	IE No support No	Opera Full support Yes	Safari ?	WebView Android Full support 4.4	Chrome Android Full support 27	Firefox Android Full support 52	Opera Android Full support Yes	Safari iOS ?	Samsung Internet Android Full support 1.5

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown