An iceconnectionstatechange event is sent to an RTCPeerConnection object when the state of its ICE connection changes. The new ICE connection state is available in the object's iceConnectionState} property.
An event handler for this event can be added using the RTCPeerConnection.oniceconnectionstatechange property or by using addEventListener() on the RTCPeerConnection.
One common task performed by the iceconnectionstatechange event listener: to trigger ICE restart when the state changes to "failed". See ICE restart in Lifetime of a WebRTC session for further information.
EventRTCPeerConnectionThis event implements the properties of Event.
This event implements the methods of Event.
| Specification | Status | Comment | 
|---|---|---|
| WebRTC 1.0: Real-time Communication Between Browsers The definition of 'iceconnectionstatechange' in that specification.  |  Candidate Recommendation | 
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| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari | 
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | No support | (Yes) | ? | 
| Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | 
|---|---|---|---|---|---|---|---|
| Basic support | ? | ? | (Yes) | ? | No support | ? | ? | 
RTCPeerConnectionRTCPeerConnection.onIceConnectionStateChangeRTCPeerConnection.iceConnectionState
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    https://developer.mozilla.org/en-US/docs/Web/Events/iceconnectionstatechange