Failed to execute 'addTransceiver' on 'RTCPeerConnection'

[Gurjinder]

Sometimes we get the following error in janus.js.

Uncaught (in promise) DOMException: Failed to execute 'addTransceiver' on 'RTCPeerConnection': This operation is only supported in 'unified-plan'.

    at createAnswer.

Value of Janus.unifiedPlan is true; 

This is the code where we get this error:

} else {

// In theory, this is the only case where we might not have a transceiver yet

audioTransceiver = config.pc.addTransceiver("audio", { direction: "recvonly" });

Janus.log("Adding recvonly audio transceiver:", audioTransceiver);

}

[Stephan Strittmatter]

Same to me. Have you found something in this case.

[Alessandro Toppi]

check the "sdpSemantics" of the involved peer connection in webrtc-internals