The RTCSessionDescription() constructor creates a new RTCSessionDescription with its properties initialized as described in the specified object.

options Optional

An object providing the default values for the session description; the object conforms to the RTCSessionDescriptionInit dictionary. That dictionary has the following properties:

type

Required. A string which is used to set the type property of the new RTCSessionDescription object.

sdp

A string containing a SDP message describing the session. This value is an empty string ("") by default and may not be null.

This example uses the constructor to convert an SDP offer into an RTCSessionDescription object.

navigator.getUserMedia({ video: true }, (stream) => {
  pc.onaddstream({ stream });
  // Adding a local stream won't trigger the onaddstream callback
  pc.addStream(stream);

  pc.createOffer((offer) => {
    pc.setLocalDescription(
      new RTCSessionDescription(offer),
      () => {
        // send the offer to a server to be forwarded to the friend you're calling.
      },
      error,
    );
  }, error);
});

This feature is not part of any current specification. It is no longer on track to become a standard.

• WebRTC API
• RTCSessionDescription