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    This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.

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

    The oncallschanged property of the Telephony interface specifies an event listener to receive callschanged events. These events occur when the list of ongoing calls, as indicated by Telephony.calls, changes.


    myTelephony.oncallschanged = function() { ... };

    These events are of type CallEvent.


    // Telephony object
    var tel = navigator.mozTelephony;
    tel.oncallschanged = function() {
      // When call list changes, do something


    Specification Status Comment
    Web Telephony Draft Draft

    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) Firefox OS (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support Not supported 12.0 (12.0) 1.0.1 Not supported Not supported Not supported

    See also

    Document Tags and Contributors

    Contributors to this page: chrisdavidmills, fscholz, jsx, kscarfone, Jeremie, Sheppy
    Last updated by: chrisdavidmills,