Notification callback for RTCPeerConnection

Dear All,
I would like to propose a NotificationCallback for RTCPeerConnection object.
This is useful, for example, in following conditions.

1. If connection is not established between the two peers within a
specified time frame, then platform can convey the userAget regarding the
connection state.

2. If connection state is expired in the middle of the session.
etc.

Suggestions and Feedback welcome.

Thanks,
Kiran.