RTCPeerConnection.connectionState - Web APIs
the read-only connectionstate property of the rtcpeerconnection interface indicates the current state of the peer connection by returning one of the string values specified by the enum rtcpeerconnectionstate.
... syntax var connectionstate = rtcpeerconnection.connectionstate; value the current state of the connection, as a value from the enum rtcpeerconnectionstate.
... rtcpeerconnectionstate enum the rtcpeerconnectionstate enum defines string constants which describe states in which the rtcpeerconnection may be.

RTCPeerConnection - Web APIs
venttargetcantrickleicecandidatesthe read-only rtcpeerconnection property cantrickleicecandidates returns a boolean which indicates whether or not the remote peer can accept trickled ice candidates.connectionstate the read-only connectionstate property of the rtcpeerconnection interface indicates the current state of the peer connection by returning one of the string values specified by the enum rtcpeerconnectionstate.currentlocaldescription read only the read-only property rtcpeerconnection.currentlocaldescription returns an rtcsessiondescription object describing the local end of the connection as it was most recently successfully negotiated since the last time the rtcpeerconnection finished negotiating and connecting to a remote peer.
... rtcpeerconnectionstate enum the rtcpeerconnectionstate enum defines string constants which describe states in which the rtcpeerconnection may be.
... note: this value moved into the rtcpeerconnectionstate enum in the may 13, 2016 draft of the specification, as it reflects the state of the rtcpeerconnection, not the signaling connection.

Index - Web APIs
3413 rtcpeerconnection.connectionstate experimental, property, rtcpeerconnection, reference, webrtc, connectionstate the read-only connectionstate property of the rtcpeerconnection interface indicates the current state of the peer connection by returning one of the string values specified by the enum rtcpeerconnectionstate.

RTCPeerConnection: connectionstatechange event - Web APIs
the new connection state can be found in connectionstate, and is one of the strings in the rtcpeerconnectionstate enumerated type.

RTCPeerConnection.signalingState - Web APIs
note: this value moved into the rtcpeerconnectionstate enum in the may 13, 2016 draft of the specification, as it reflects the state of the rtcpeerconnection, not the signaling connection.