diff --git a/extensions/voice-call/src/media-stream.lifecycle.test.ts b/extensions/voice-call/src/media-stream.lifecycle.test.ts
new file mode 100644
index 000000000000..8a6f54286770
--- /dev/null
+++ b/extensions/voice-call/src/media-stream.lifecycle.test.ts
@@ -0,0 +1,72 @@
+import type { RealtimeTranscriptionSession } from "openclaw/plugin-sdk/realtime-transcription";
+import { describe, expect, it, vi } from "vitest";
+import { MediaStreamHandler } from "./media-stream.js";
+import { connectWs, startUpgradeWsServer, waitForClose } from "./websocket-test-support.js";
+
+describe("MediaStreamHandler lifecycle", () => {
+  it("rejects duplicate start frames without creating another STT session", async () => {
+    const sttSession: RealtimeTranscriptionSession = {
+      connect: async () => {},
+      sendAudio: () => {},
+      close: vi.fn(),
+      isConnected: () => true,
+    };
+    const createSession = vi.fn(() => sttSession);
+    const shouldAcceptStream = vi.fn(() => true);
+    const onConnect = vi.fn();
+    const onDisconnect = vi.fn();
+    const handler = new MediaStreamHandler({
+      transcriptionProvider: {
+        createSession,
+        id: "openai",
+        label: "OpenAI",
+        isConfigured: () => true,
+      },
+      providerConfig: {},
+      shouldAcceptStream,
+      onConnect,
+      onDisconnect,
+    });
+    const server = await startUpgradeWsServer({
+      urlPath: "/voice/stream",
+      onUpgrade: (request, socket, head) => {
+        handler.handleUpgrade(request, socket, head);
+      },
+    });
+
+    try {
+      const ws = await connectWs(server.url);
+      ws.send(
+        JSON.stringify({
+          event: "start",
+          streamSid: "MZ-first",
+          start: { callSid: "CA-first" },
+        }),
+      );
+      await vi.waitFor(() => {
+        expect(onConnect).toHaveBeenCalledWith("CA-first", "MZ-first");
+      });
+
+      ws.send(
+        JSON.stringify({
+          event: "start",
+          streamSid: "MZ-second",
+          start: { callSid: "CA-second" },
+        }),
+      );
+      const closed = await waitForClose(ws);
+
+      expect(closed).toEqual({ code: 1008, reason: "Duplicate start" });
+      expect(createSession).toHaveBeenCalledTimes(1);
+      expect(shouldAcceptStream).toHaveBeenCalledTimes(1);
+      expect(onConnect).toHaveBeenCalledTimes(1);
+      await vi.waitFor(() => {
+        expect(sttSession.close).toHaveBeenCalledTimes(1);
+        expect(onDisconnect).toHaveBeenCalledWith("CA-first", "MZ-first");
+        expect(onDisconnect).toHaveBeenCalledTimes(1);
+      });
+    } finally {
+      await server.close();
+    }
+  });
+});
diff --git a/extensions/voice-call/src/media-stream.test.ts b/extensions/voice-call/src/media-stream.test.ts
index 9c6e77335f4f..a40566bc16e6 100644
--- a/extensions/voice-call/src/media-stream.test.ts
+++ b/extensions/voice-call/src/media-stream.test.ts
@@ -253,65 +253,6 @@ describe("MediaStreamHandler security hardening", () => {
     }
   });
 
-  it("rejects duplicate start frames without creating another STT session", async () => {
-    const sttSession = {
-      ...createStubSession(),
-      close: vi.fn(),
-    };
-    const createSession = vi.fn(() => sttSession);
-    const shouldAcceptStream = vi.fn(() => true);
-    const onConnect = vi.fn();
-    const onDisconnect = vi.fn();
-    const handler = new MediaStreamHandler({
-      transcriptionProvider: {
-        createSession,
-        id: "openai",
-        label: "OpenAI",
-        isConfigured: () => true,
-      },
-      providerConfig: {},
-      shouldAcceptStream,
-      onConnect,
-      onDisconnect,
-    });
-    const server = await startWsServer(handler);
-
-    try {
-      const ws = await connectWs(server.url);
-      ws.send(
-        JSON.stringify({
-          event: "start",
-          streamSid: "MZ-first",
-          start: { callSid: "CA-first" },
-        }),
-      );
-      await vi.waitFor(() => {
-        expect(onConnect).toHaveBeenCalledWith("CA-first", "MZ-first");
-      });
-
-      ws.send(
-        JSON.stringify({
-          event: "start",
-          streamSid: "MZ-second",
-          start: { callSid: "CA-second" },
-        }),
-      );
-      const closed = await waitForClose(ws);
-
-      expect(closed).toEqual({ code: 1008, reason: "Duplicate start" });
-      expect(createSession).toHaveBeenCalledTimes(1);
-      expect(shouldAcceptStream).toHaveBeenCalledTimes(1);
-      expect(onConnect).toHaveBeenCalledTimes(1);
-      await vi.waitFor(() => {
-        expect(sttSession.close).toHaveBeenCalledTimes(1);
-        expect(onDisconnect).toHaveBeenCalledWith("CA-first", "MZ-first");
-        expect(onDisconnect).toHaveBeenCalledTimes(1);
-      });
-    } finally {
-      await server.close();
-    }
-  });
-
   it("emits common Talk events for telephony STT/TTS sessions", async () => {
     let callbacks: RealtimeTranscriptionSessionCreateRequest | undefined;
     const sentAudio: Buffer[] = [];