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

The speakerEnabled property of the Telephony interface indicates whether or not the speakerphone functionality of the phone is enabled.


// Is the speaker enabled?
var speakerEnabled = myTelephony.speakerEnabled;
// Turn on the speaker
myTelephony.speakerEnabled = true;                 


 A Booleantrue indicates the speaker is enabled; false indicates that it is not. You may read and write this value.


// Telephony object
var tel = navigator.mozTelephony;

// Receive a call
tel.onincoming = function (e) {
  var incomingCall =;

  // Answer the call

// Say we have a button that activates/deactivates the speaker phone
muteButton.onclick = function() {
  if(tel.speakerEnabled) {
    tel.speakerEnabled = false;
  } else {
    tel.speakerEnabled = true;


Specification Status Comment
Web Telephony Draft Draft

Browser compatibility

For obvious reasons, support is primarily expected on mobile browsers.

Supported in Firefox OS 1.0.1.

See also

Document Tags and Contributors

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