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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.


    A reference to a function to be called to handle the Telephony API's busy event. This event occurs when the call receives a busy signal from the phone network. The event handler is called with a CallEvent as its only parameter.


    instanceOfTelephonyCall.onbusy = funcRef;

    Where funcRef is a function to be called when the busy event occurs. These events are of type CallEvent.


    This is a non standard implementation, but it is discussed 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

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