CoTurn

Run this command in your VPS Terminal

sudo apt-get -y update
sudo apt-get install coturn

Open the coturn file by sudo nano /etc/default/coturn command and set it: TURNSERVER_ENABLED=1

Then config the turnserver.conf file. Open it by sudo nano /etc/turnserver.conf and set this config and change your Public IP address

external-ip=<Public IP>/10.0.0.5 # Set your Public IP address here.
listening-ip=0.0.0.0
listening-port=3478
relay-ip=10.0.0.5
lt-cred-mech
user=testuser:testpass # This is the Turn `User & Password`
realm=turnserver.example
server-name=turnserver.example
log-file=/var/log/turnserver.log
simple-log
fingerprint
min-port=49152
max-port=65535
no-multicast-peers
no-cli
# Allow only UDP relays
no-tcp-relay

Run the Turn server by this command

sudo systemctl restart coturn
sudo systemctl status coturn

coturn.service - coTURN STUN/TURN Server
 Loaded: loaded (/lib/systemd/system/coturn.service; enabled; vendor preset: enabled)
 Active: active (running) since Mon 2025年04月21日 04:21:21 UTC; 23ms ago
 Docs: man:coturn(1)
 man:turnadmin(1)
 man:turnserver(1)
 Main PID: 66855 (turnserver)
 Tasks: 7 (limit: 4687)
 Memory: 11.0M
 CPU: 42ms
 CGroup: /system.slice/coturn.service
 └─66855 /usr/bin/turnserver -c /etc/turnserver.conf
Apr 21 04:21:21 free-radius systemd[1]: Starting coTURN STUN/TURN Server...
Apr 21 04:21:21 free-radius systemd[1]: Started coTURN STUN/TURN Server.

If the response is not look like that, Ask on AI with the error

Now how you will implement that

 const peer = new Peer(localPeerId, {
 host: '<PeerJS Server IP>', // Your Peerjs server IP or domain
 port: 9000, // Your PeerJS server port
 path: '/myapp', // Custom path if you used one
 // secure: false, Set to true if you use HTTPS + WSS
 config: {
 iceServers: [
 { url: 'stun:stun.l.google.com:19302' },
 { url: 'stun:<YOUR PUBLIC IP>:3478' }, // Set your public IP
 {
 url: 'turn:<YOUR PUBLIC IP>:3478', // Set your public IP
 username: 'testuser', // Set your Username that is seted in Turn Server.
 credential: 'testpass' // Set you password that is seted in Turn Server.
 }]
 }
 });