diff --git a/configs/deployment/configs/turnserver.conf b/configs/deployment/configs/turnserver.conf
index eaa2bdf9..efa6a01d 100644
--- a/configs/deployment/configs/turnserver.conf
+++ b/configs/deployment/configs/turnserver.conf
@@ -14,7 +14,7 @@ tls-listening-port=5349
 # IP / Domain
 listening-ip=0.0.0.0
 relay-ip=0.0.0.0
-external-ip=213.238.160.83/172.20.0.2
+external-ip=213.238.160.81/172.20.0.2
 realm=turn.sozsoft.com
 
 # Auth
diff --git a/ui/src/services/classroom/webrtc.tsx b/ui/src/services/classroom/webrtc.tsx
index 6b33dc05..f7682263 100644
--- a/ui/src/services/classroom/webrtc.tsx
+++ b/ui/src/services/classroom/webrtc.tsx
@@ -15,8 +15,16 @@ export class WebRTCService {
 
   private rtcConfiguration: RTCConfiguration = {
     iceServers: [
-      { urls: 'stun:stun.l.google.com:19302' },
-      { urls: 'stun:stun1.l.google.com:19302' },
+      {
+        urls: [
+          'stun:turn.sozsoft.com:3478',
+          'turn:turn.sozsoft.com:3478?transport=udp',
+          'turn:turn.sozsoft.com:3478?transport=tcp',
+          'turns:turn.sozsoft.com:5349?transport=tcp',
+        ],
+        username: 'webrtc',
+        credential: 'strongpassword123',
+      },
     ],
   }