diff --git a/src/domain/session/room/timeline/tiles/CallTile.js b/src/domain/session/room/timeline/tiles/CallTile.js
index 37be05be..05762bc0 100644
--- a/src/domain/session/room/timeline/tiles/CallTile.js
+++ b/src/domain/session/room/timeline/tiles/CallTile.js
@@ -118,11 +118,14 @@ export class CallTile extends SimpleTile {
     }
 
     get typeLabel() {
+        if (this._call && this._call.usesFoci) {
+            return `This call uses a stream-forwarding unit, which isn't supported yet, so you can't join this call.`;
+        }
         if (this.type === CallType.Video) {
-                return `Video call`;
-            } else {
-                return `Voice call`;
-            }
+            return `Video call`;
+        } else {
+            return `Voice call`;
+        }
     }
 
     get type() {