When spec-complaint SDP format "Unified Plan" is used, RTCRtpTransceiver describes each sender-receiver pair that is added to the RTCPeerConnection. This represents the components used to send and receive media. Exposing the transceiver gives the application the ability to receive media early and provides more control over the generated SDP. APIs that are shipping include RTCRtpTransceiver, RTCPeerConnection.addTransceiver() and RTCPeerConnection.getTransceivers().