title: STUN/TURN servers in WebRTC
body: <p>I started learning webRTC  a few days back. WebRTC follows offer/answer model. Do all the exchanges(metadata, network information, and media streams) follow this model? Do we need of STUN/TURN servers in all the exchanges. After getting the public IPs of the peers from STUN/TURN server for the first time, peer to peer communication can be started . </p>