rtcConfig.json

{
  "iceServers": [
    {
      "url": "stun:23.21.150.121",
      "urls": "stun:23.21.150.121"
    },
    {
      "url": "turn:global.turn.twilio.com:3478?transport=udp",
      "username": "f45ae923bea0b81c4c680c7961ca2ef3ecd012c9865b29edf1733a9b17bf1701",
      "credential": "C+M4zrubA24SPH74R/ve4mVeR1wYBnBwQFO5HawqK54=",
      "urls": "turn:global.turn.twilio.com:3478?transport=udp"
    },
    {
      "url": "turn:global.turn.twilio.com:3478?transport=tcp",
      "username": "f45ae923bea0b81c4c680c7961ca2ef3ecd012c9865b29edf1733a9b17bf1701",
      "credential": "C+M4zrubA24SPH74R/ve4mVeR1wYBnBwQFO5HawqK54=",
      "urls": "turn:global.turn.twilio.com:3478?transport=tcp"
    },
    {
      "url": "turn:global.turn.twilio.com:443?transport=tcp",
      "username": "f45ae923bea0b81c4c680c7961ca2ef3ecd012c9865b29edf1733a9b17bf1701",
      "credential": "C+M4zrubA24SPH74R/ve4mVeR1wYBnBwQFO5HawqK54=",
      "urls": "turn:global.turn.twilio.com:443?transport=tcp"
    }
  ]
}