This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The RTCDTMFToneChangeEvent() constructor creates a new RTCDTMFToneChangeEvent.


 var event = new RTCDTMFToneChangeEvent(type, options);


A DOMString containing the name of the event. This is always "tonechange".
A dictionary of type RTCDTMFToneChangeEventInit, which may contain one or more of the following fields:
A DOMString containing a single DTMF tone character which has just begun to play, or an empty string ("") to indicate that the previous tone has stopped playing. See Tone characters for details on what characters are permitted.

Return value

A newly-created RTCDTMFToneChangeEvent, configured as specified in the provided options.

Tone characters

The digits 0-9
These characters represent the digit keys on a telephone keypad.
The letters A-D
These characters represent the "A" through "D" keys which are part of the DTMF standard but not included on most telephones. These are not interpreted as digits. Lower-case "a"-"d" automatically gets converted to upper-case.
The pound/hash sign ("#") and the asterisk ("*")
These correspond to the similarly-labeled keys which are typically on the bottom row of the telephone keypad.
The comma (",")
This character instructs the dialing process to pause for two seconds before sending the next character in the buffer.

All other characters are unrecognized and will cause insertDTMF() to throw an InvalidCharacterError exception.


Specification Status Comment
WebRTC 1.0: Real-time Communication Between Browsers
The definition of 'RTCDTMFToneChangeEvent()' in that specification.
Working Draft Initial definition.

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) ? 52 (52) No support ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? 52.0 (52) No support ? ?

See also

Document Tags and Contributors

 Contributors to this page: Sheppy
 Last updated by: Sheppy,