diff --git a/packages/uipath/src/uipath/_cli/_chat/_voice_bridge.py b/packages/uipath/src/uipath/_cli/_chat/_voice_bridge.py
index 6164b9f3d..75a6654af 100644
--- a/packages/uipath/src/uipath/_cli/_chat/_voice_bridge.py
+++ b/packages/uipath/src/uipath/_cli/_chat/_voice_bridge.py
@@ -74,6 +74,18 @@ def __init__(
         self._done = asyncio.Event()
         self._in_flight: set[asyncio.Task[None]] = set()
         self._end_reason: VoiceSessionEndReason | None = None
+        self._end_detail: dict[str, Any] = {}
+
+    @property
+    def end_detail(self) -> dict[str, Any]:
+        """Opaque termination detail CAS forwarded over `voice_session_ended`.
+
+        Forwarded verbatim — arbitrary keys flow through untouched. CAS currently
+        sends `endedBy` ('agent'|'user'|'system'|'error'), `callEnded` (bool), and
+        an optional `reason`; older payloads carried `callSid`/`terminationReason`.
+        Not validated into a model; the job runtime curates what it surfaces as output.
+        """
+        return self._end_detail
 
     async def run(self) -> VoiceSessionEndReason:
         """Connect, dispatch tool calls until session ends, then disconnect.
@@ -206,8 +218,18 @@ async def _execute_tool_call(self, call: UiPathVoiceToolCallRequest) -> None:
             tool_result.is_error,
         )
 
-    async def _handle_session_ended(self, _data: Any, *_: Any) -> None:
-        logger.info("[Voice] voice_session_ended received")
+    async def _handle_session_ended(self, data: Any = None, *_: Any) -> None:
+        # Stored opaquely: arbitrary keys (endedBy, callEnded, reason, ...) flow
+        # through untouched for the job runtime to surface as output.
+        detail = data if isinstance(data, dict) else {}
+        self._end_detail = detail
+        logger.info(
+            "[Voice] voice_session_ended received "
+            "(endedBy=%s, callEnded=%s, reason=%s)",
+            detail.get("endedBy"),
+            detail.get("callEnded"),
+            detail.get("reason"),
+        )
         self._end_session(VoiceSessionEndReason.COMPLETED)
 
 
diff --git a/packages/uipath/tests/cli/chat/test_voice_bridge.py b/packages/uipath/tests/cli/chat/test_voice_bridge.py
index b945fb6e3..da8a6050f 100644
--- a/packages/uipath/tests/cli/chat/test_voice_bridge.py
+++ b/packages/uipath/tests/cli/chat/test_voice_bridge.py
@@ -42,6 +42,35 @@ async def test_session_ended_sets_completed(self) -> None:
         await session._handle_session_ended(None)
         assert session._end_reason == VoiceSessionEndReason.COMPLETED
 
+    async def test_session_ended_preserves_payload_opaquely(self) -> None:
+        """Regression: arbitrary CAS keys (endedBy, callEnded, reason) survive untouched.
+
+        The bridge forwards `end_detail` verbatim; the job runtime curates what it
+        surfaces. New contract keys must arrive in `end_detail` unmodified.
+        """
+        session = _make_session()
+        payload = {
+            "conversationId": "conv-1",
+            "endedBy": "agent",
+            "callEnded": False,
+            "reason": "agent_completed",
+            "someFutureKey": {"nested": True},
+        }
+
+        await session._handle_session_ended(payload)
+
+        assert session.end_detail == payload
+        assert session.end_detail["endedBy"] == "agent"
+        assert session.end_detail["callEnded"] is False
+        assert session._end_reason == VoiceSessionEndReason.COMPLETED
+
+    async def test_session_ended_non_dict_payload_is_empty_detail(self) -> None:
+        """A non-dict payload (e.g. None) yields an empty detail, not a crash."""
+        session = _make_session()
+        await session._handle_session_ended("not-a-dict")
+        assert session.end_detail == {}
+        assert session._end_reason == VoiceSessionEndReason.COMPLETED
+
     async def test_disconnect_sets_disconnected(self) -> None:
         session = _make_session()
         await session._handle_disconnect()