when closing websocket at end of call send ws code 1000

lib/tasks/hangup.js

@@ -18,6 +18,7 @@ class TaskHangup extends Task {
     await super.exec(cs);
     try {
       await dlg.destroy({headers: this.headers});
+      cs._callReleased();
     } catch (err) {
       this.logger.error(err, 'TaskHangup:exec - Error hanging up call');
     }