Question: Why call user after answer made?

[VincentHoang]

On the following snippet (scripts/index.js)

socket.on("answer-made", async data => {
  await peerConnection.setRemoteDescription(
    new RTCSessionDescription(data.answer)
  );

  if (!isAlreadyCalling) {
    callUser(data.socket); // ??
    isAlreadyCalling = true;
  }
});

Why does the receiver have to make a call back to the initial caller? I looked through several tutorials, and none of them mentions that.