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This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

This API is available on Firefox OS for internal applications only.


Returns a TelephonyCall object indicating the call that is currently active. The active call is the one that is currently receiving input from the microphone as well as tones generated by calls to the Telephony.startTone() method.


var call =;


Returns a TelephonyCall object representing the currently-active call.


This is a non standard implementation, but it is discussing at W3C as part of the System Application Working Group.

Specification Status Comment
Web Telephony API Editor's Draft Editor Draft (WIP).

Browser compatibility

For obvious reasons, support is primarily expected on mobile browsers.

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support Not supported Not supported Not supported Not supported Not supported
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support Not supported 12.0 (12.0) Not supported Not supported Not supported

See also

Document Tags and Contributors

 Last updated by: Sheppy,