{
  "iceServers": [
    {
      "urls": "stun:stun.l.google.com:19302"
    },
    {
      "urls": "stun:stun1.l.google.com:19302"
    },
    {
      "urls": "turn:turnserver.example.com:3478",
      "username": "your_username",
      "credential": "your_password"
    }
  ]
}