diff --git a/it0_app/lib/features/agent_call/presentation/pages/voice_test_page.dart b/it0_app/lib/features/agent_call/presentation/pages/voice_test_page.dart
index 3458d0a..fd3be39 100644
--- a/it0_app/lib/features/agent_call/presentation/pages/voice_test_page.dart
+++ b/it0_app/lib/features/agent_call/presentation/pages/voice_test_page.dart
@@ -5,6 +5,8 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:dio/dio.dart';
 import 'package:record/record.dart';
 import 'package:flutter_sound/flutter_sound.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:path/path.dart' as p;
 import '../../../../core/network/dio_client.dart';
 
 /// Temporary voice I/O test page — TTS + STT + Round-trip.
@@ -119,6 +121,8 @@ class _VoiceTestPageState extends ConsumerState<VoiceTestPage> {
         _rtResult = '';
       }
     });
+    final dir = await getTemporaryDirectory();
+    final filePath = p.join(dir.path, 'voice_test_${DateTime.now().millisecondsSinceEpoch}.wav');
     await _recorder.start(
       const RecordConfig(
         encoder: AudioEncoder.wav,
@@ -126,7 +130,7 @@ class _VoiceTestPageState extends ConsumerState<VoiceTestPage> {
         numChannels: 1,
         bitRate: 256000,
       ),
-      path: '',  // temp file
+      path: filePath,
     );
   }