This feature encapsulates the addition of the following methods to RTCPeerConnection: getSenders(), getReceivers(), addTrack(MediaStreamTrack track, MediaStream... streams), and removeTrack(RTCRtpSender sender). The RTCRtpSender and RTCRtpReceiver objects will initially be limited to supporting the "track" attribute, with RTCRtpSender also supporting "replaceTrack(MediaStreamTrack withTrack)".