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

The onconnecting event handler of the TelephonyCall interface is a reference to a function to be called to handle the Telephony API's connecting event.

This event occurs when the call has finished dialing but before the connection is made. The event handler is called with a CallEvent as its only parameter.


myCall.onconnecting = function() { ... };


// Telephony object
var tel = navigator.mozTelephony;

// Place a call
tel.dial("123456789").then(function(call) {

  call.onconnecting = function(e) {
    console.log('Your call to ' + + ' is connecting.');


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


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API B2G Certified DOM DOM Reference Firefox OS Mobile Non-standard onconnecting Property Reference Référence Telephony TelephonyCall WebAPI