diff --git a/packages/services/voice-agent/src/agent.py b/packages/services/voice-agent/src/agent.py
index a637024..d1af8c7 100644
--- a/packages/services/voice-agent/src/agent.py
+++ b/packages/services/voice-agent/src/agent.py
@@ -297,13 +297,18 @@ async def entrypoint(ctx: JobContext) -> None:
             engine_type=engine_type,
         )
 
-        # Create and start AgentSession with the full pipeline
-        session = AgentSession(
+        # Create and start AgentSession with the full pipeline.
+        # Speechmatics handles end-of-utterance natively via its Voice Agent
+        # API, so we use turn_detection="stt" to let it drive turn boundaries.
+        session_kwargs = dict(
             vad=ctx.proc.userdata["vad"],
             stt=stt,
             llm=llm,
             tts=tts,
         )
+        if stt_provider == "speechmatics":
+            session_kwargs["turn_detection"] = "stt"
+        session = AgentSession(**session_kwargs)
 
         await session.start(
             agent=IT0VoiceAgent(),
diff --git a/packages/services/voice-agent/src/plugins/speechmatics_stt.py b/packages/services/voice-agent/src/plugins/speechmatics_stt.py
index fe500da..82a83fe 100644
--- a/packages/services/voice-agent/src/plugins/speechmatics_stt.py
+++ b/packages/services/voice-agent/src/plugins/speechmatics_stt.py
@@ -9,7 +9,7 @@ by the livekit-plugins-speechmatics package.
 """
 import logging
 
-from livekit.plugins.speechmatics import STT, TurnDetectionMode
+from livekit.plugins.speechmatics import STT
 
 logger = logging.getLogger(__name__)
 
@@ -39,14 +39,10 @@ def create_speechmatics_stt(language: str = "cmn") -> STT:
     stt = STT(
         language=sm_lang,
         include_partials=True,
-        # Use EXTERNAL turn detection so LiveKit's own VAD handles turn
-        # boundaries.  ADAPTIVE enables a second client-side Silero VAD inside
-        # the Speechmatics SDK which conflicts with LiveKit's pipeline.
-        turn_detection_mode=TurnDetectionMode.EXTERNAL,
     )
     # Workaround: LiveKit's LanguageCode normalizes ISO 639-3 "cmn" back to
     # ISO 639-1 "zh", but Speechmatics expects "cmn".  Override the internal
     # option after construction so the raw Speechmatics code is sent.
     stt._stt_options.language = sm_lang  # type: ignore[assignment]
-    logger.info("Speechmatics STT created: language=%s (input=%s), turn_detection=EXTERNAL", sm_lang, language)
+    logger.info("Speechmatics STT created: language=%s (input=%s)", sm_lang, language)
     return stt