diff --git a/back/src/Controller/IoSocketController.ts b/back/src/Controller/IoSocketController.ts
index 1d5bbe06..5f1bc47f 100644
--- a/back/src/Controller/IoSocketController.ts
+++ b/back/src/Controller/IoSocketController.ts
@@ -33,7 +33,8 @@ enum SockerIoEvent {
     MESSAGE_ERROR = "message-error",
     GROUP_CREATE_UPDATE = "group-create-update",
     GROUP_DELETE = "group-delete",
-    SET_PLAYER_DETAILS = "set-player-details"
+    SET_PLAYER_DETAILS = "set-player-details",
+    SET_SILENT = "set_silent", // Set or unset the silent mode for this user.
 }
 
 export class IoSocketController {
@@ -274,6 +275,29 @@ export class IoSocketController {
                 Client.characterLayers = playerDetails.characterLayers;
                 answerFn(Client.userId);
             });
+
+            socket.on(SockerIoEvent.SET_SILENT, (silent: unknown) => {
+                if (typeof silent !== "boolean") {
+                    socket.emit(SockerIoEvent.MESSAGE_ERROR, {message: 'Invalid SET_SILENT message.'});
+                    console.warn('Invalid SET_SILENT message received: ', silent);
+                    return;
+                }
+
+                try {
+                    const Client = (socket as ExSocketInterface);
+
+                    // update position in the world
+                    const world = this.Worlds.get(Client.roomId);
+                    if (!world) {
+                        console.error("Could not find world with id '", Client.roomId, "'");
+                        return;
+                    }
+                    world.setSilent(Client, silent);
+                } catch (e) {
+                    console.error('An error occurred on "SET_SILENT"');
+                    console.error(e);
+                }
+            });
         });
     }
 
diff --git a/back/src/Model/UserInterface.ts b/back/src/Model/UserInterface.ts
index 743f8b4d..89994a31 100644
--- a/back/src/Model/UserInterface.ts
+++ b/back/src/Model/UserInterface.ts
@@ -4,5 +4,6 @@ import { PointInterface } from "./Websocket/PointInterface";
 export interface UserInterface {
     id: string,
     group?: Group,
-    position: PointInterface
-}
\ No newline at end of file
+    position: PointInterface,
+    silent: boolean
+}
diff --git a/back/src/Model/World.ts b/back/src/Model/World.ts
index 6d4fc205..8855702e 100644
--- a/back/src/Model/World.ts
+++ b/back/src/Model/World.ts
@@ -55,7 +55,8 @@ export class World {
     public join(socket : Identificable, userPosition: PointInterface): void {
         this.users.set(socket.userId, {
             id: socket.userId,
-            position: userPosition
+            position: userPosition,
+            silent: false // FIXME: silent should be set at the correct value when joining a room.
         });
         // Let's call update position to trigger the join / leave room
         this.updatePosition(socket, userPosition);
@@ -84,6 +85,10 @@ export class World {
 
         user.position = userPosition;
 
+        if (user.silent) {
+            return;
+        }
+
         if (typeof user.group === 'undefined') {
             // If the user is not part of a group:
             //  should he join a group?
@@ -118,6 +123,26 @@ export class World {
         }
     }
 
+    setSilent(socket: Identificable, silent: boolean) {
+        const user = this.users.get(socket.userId);
+        if(typeof user === 'undefined') {
+            console.warn('In setSilent, could not find user with ID "'+socket.userId+'" in world.');
+            return;
+        }
+        if (user.silent === silent) {
+            return;
+        }
+
+        user.silent = silent;
+        if (silent && user.group !== undefined) {
+            this.leaveGroup(user);
+        }
+        if (!silent) {
+            // If we are back to life, let's trigger a position update to see if we can join some group.
+            this.updatePosition(socket, user.position);
+        }
+    }
+
     /**
      * Makes a user leave a group and closes and destroy the group if the group contains only one remaining person.
      *
@@ -145,6 +170,7 @@ export class World {
      * Looks for the closest user that is:
      * - close enough (distance <= minDistance)
      * - not in a group
+     * - not silent
      * OR
      * - close enough to a group (distance <= groupRadius)
      */
@@ -160,6 +186,9 @@ export class World {
             if(currentUser === user) {
                 return;
             }
+            if (currentUser.silent) {
+                return;
+            }
 
             const distance = World.computeDistance(user, currentUser); // compute distance between peers.
 
diff --git a/front/src/Connection.ts b/front/src/Connection.ts
index 783b5d41..4a184c52 100644
--- a/front/src/Connection.ts
+++ b/front/src/Connection.ts
@@ -24,6 +24,7 @@ enum EventMessage{
     SET_PLAYER_DETAILS = "set-player-details", // Send the name and character to the server (on connect), receive back the id.
 
     CONNECT_ERROR = "connect_error",
+    SET_SILENT = "set_silent", // Set or unset the silent mode for this user.
 }
 
 export interface PointInterface {
@@ -167,6 +168,10 @@ export class Connection implements Connection {
         this.socket.emit(EventMessage.USER_POSITION, point);
     }
 
+    public setSilent(silent: boolean): void {
+        this.socket.emit(EventMessage.SET_SILENT, silent);
+    }
+
     public onUserJoins(callback: (message: MessageUserJoined) => void): void {
         this.socket.on(EventMessage.JOIN_ROOM, callback);
     }
diff --git a/front/src/Phaser/Game/GameScene.ts b/front/src/Phaser/Game/GameScene.ts
index 485b7dce..c30bdf61 100644
--- a/front/src/Phaser/Game/GameScene.ts
+++ b/front/src/Phaser/Game/GameScene.ts
@@ -423,9 +423,10 @@ export class GameScene extends Phaser.Scene implements CenterListener {
                 CoWebsiteManager.loadCoWebsite(newValue as string);
             }
         });
-        let jitsiApi: any;
+        let jitsiApi: any; // eslint-disable-line @typescript-eslint/no-explicit-any
         this.gameMap.onPropertyChange('jitsiRoom', (newValue, oldValue) => {
             if (newValue === undefined) {
+                this.connection.setSilent(false);
                 jitsiApi?.dispose();
                 CoWebsiteManager.closeCoWebsite();
             } else {
@@ -444,9 +445,10 @@ export class GameScene extends Phaser.Scene implements CenterListener {
                             MOBILE_APP_PROMO: false
                         }
                     };
-                    jitsiApi = new (window as any).JitsiMeetExternalAPI(domain, options);
+                    jitsiApi = new (window as any).JitsiMeetExternalAPI(domain, options); // eslint-disable-line @typescript-eslint/no-explicit-any
                     jitsiApi.executeCommand('displayName', gameManager.getPlayerName());
-                }))
+                }));
+                this.connection.setSilent(true);
             }
         });
     }