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

The onincoming() property of the TelephonyCall interface is a reference to a function to be called to handle the Telephony API's incoming event.

This event occurs when an incoming call is detected. The event handler is called with a CallEvent as its only parameter.


MyCall.onincoming = function() { ... };

These events are of type CallEvent.


// 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 No support No support No support No support No support
Feature Android Firefox Mobile (Gecko) Firefox OS (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support 12.0 (12.0) 1.0.1 No support No support No support

See also

Document Tags and Contributors

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