RTCRtpTransceiver.mid

The read-only RTCRtpTransceiver interface's mid property specifies the negotiated media ID (mid) which the local and remote peers have agreed upon to uniquely identify the stream's pairing of sender and receiver.

var mediaID = RTCRtpTransceiver.mid;

A DOMString which uniquely identifies the pairing of source and destination of the transceiver's stream. Its value is taken from the media ID of the SDP m-line. This value is null if negotiation has not completed.

• Introduction to the Real-time Transport Protocol (RTP)