diff --git a/src/controllers/CallsController.ts b/src/controllers/CallsController.ts
index c92d713..0e90de6 100644
--- a/src/controllers/CallsController.ts
+++ b/src/controllers/CallsController.ts
@@ -6,6 +6,8 @@ import * as ws from 'ws'
 import { WsMessage } from "../entities/WsMessage";
 import { conf } from "../helpers/ConfigHelper";
 import { RTCRelayController } from "./RTCRelayController";
+import { ConversationsHelper } from "../helpers/ConversationsHelper";
+import { CallsHelper } from "../helpers/CallsHelper";
 
 /**
  * Legacy calls controller
@@ -60,6 +62,11 @@ export class CallsController {
 	public static async JoinCall(h: UserWebSocketRequestsHandler) {
 		const convID = await h.postConversationId("convID");
 
+		// Check if the conversation is authorized to have a call
+		const conv = await ConversationsHelper.GetSingle(convID, h.getUserId());
+		if(!CallsHelper.CanHaveCall(conv))
+			h.error(401, "This conversation is not allowed to have a call!");
+
 		// If the user was active in any other calls, remove him
 		for(const c of UserWebSocketController.active_clients.filter((f) => f.userID == h.getUserId() && f.activeCalls.has(convID)))
 			await this.MakeUserLeaveCall(convID, c)