etwork allows UDP traffic on port 3478/19302',
                        'Try a different network connection'
                    ]);
            }
            
            // Environment checks
            if (window.self !== window.top) {
                addCheckItem('info', 'Running in iFrame', 
                    'This page is running inside an iframe (like Claude.ai\'s artifact viewer). ' +
                    'iFrames often have additional security restrictions that limit WebRTC functionality.');
     