The role read-only property of the RTCIceTransport interface indicates which ICE role the transport is fulfilling: that of the controlling agent, or the agent that is being controlled.
You can learn more about ICE roles in Choosing a candidate pair.
A string specifying whether the RTCIceTransport represents the controlling agent or the controlled agent.
The value must be one of the following:
"controlled"The transport is the controlled agent.
"controlling"The RTCIceTransport object is serving as the controlling agent.
"unknown"The role has not yet been determined.