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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 CallEvent interface of the Web Telephony API represents events related to telephone calls.

    Properties Read only
    A TelephonyCall object representing the call from which the event originated.


    // Telephony object
    var tel = navigator.mozTelephony;
    // Receive a call
    tel.onincoming = function(e) {
      var incomingCall =;
      // Answer the call


    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: Sheppy, fscholz, Jeremie, teoli, tregagnon, chrisdavidmills, MHasan
    Last updated by: chrisdavidmills,