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

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