diff --git a/services/ai_voice_runtime_service/app.py b/services/ai_voice_runtime_service/app.py
index c238f4c..942dbea 100644
--- a/services/ai_voice_runtime_service/app.py
+++ b/services/ai_voice_runtime_service/app.py
@@ -114,7 +114,7 @@ def _vad_min_speech_ms() -> int:
 
 
 def _vad_trailing_silence_ms() -> int:
-    return max(_int_env("AI_VOICE_VAD_TRAILING_SILENCE_MS", 700), _vad_frame_ms())
+    return max(_int_env("AI_VOICE_VAD_TRAILING_SILENCE_MS", 500), _vad_frame_ms())
 
 
 def _turn_max_ms() -> int: