Whenever that is given a non-false value, and the RTCPeerConnection has no non-stopped "sendrecv" or "recvonly" audio transceivers, createOffer() Must as its first step invoke the equal of addTransceiver("audio") on the RTCPeerConnection object, except that this Must NOT Update the negotiation-wanted flag, and, offered this does not fail, proceed with createOffer()'s common steps.