diff --git a/extensions/voice-call/src/providers/twilio.test.ts b/extensions/voice-call/src/providers/twilio.test.ts
index 39cfb8e82b4f..02a6ec6f13f9 100644
--- a/extensions/voice-call/src/providers/twilio.test.ts
+++ b/extensions/voice-call/src/providers/twilio.test.ts
@@ -28,6 +28,50 @@ function createProvider(): TwilioProvider {
   );
 }
 
+type TwilioPrivateCallState = {
+  callWebhookUrls: Map<string, string>;
+  callStreamMap: Map<string, string>;
+  streamAuthTokens: Map<string, string>;
+  twimlStorage: Map<string, string>;
+  notifyCalls: Set<string>;
+  activeStreamCalls: Set<string>;
+};
+
+function getTwilioPrivateCallState(provider: TwilioProvider): TwilioPrivateCallState {
+  return provider as unknown as TwilioPrivateCallState;
+}
+
+function seedTwilioPrivateCallState(params: {
+  provider: TwilioProvider;
+  callId: string;
+  providerCallId: string;
+}): void {
+  const state = getTwilioPrivateCallState(params.provider);
+  state.callWebhookUrls.set(
+    params.providerCallId,
+    `https://example.ngrok.app/voice/twilio?callId=${params.callId}`,
+  );
+  state.callStreamMap.set(params.providerCallId, "MZ-private-state");
+  state.streamAuthTokens.set(params.providerCallId, "stream-token");
+  state.twimlStorage.set(params.callId, "<Response><Say>Hello</Say></Response>");
+  state.notifyCalls.add(params.callId);
+  state.activeStreamCalls.add(params.providerCallId);
+}
+
+function expectTwilioPrivateCallStateReleased(params: {
+  provider: TwilioProvider;
+  callId: string;
+  providerCallId: string;
+}): void {
+  const state = getTwilioPrivateCallState(params.provider);
+  expect(state.callWebhookUrls.has(params.providerCallId)).toBe(false);
+  expect(state.callStreamMap.has(params.providerCallId)).toBe(false);
+  expect(state.streamAuthTokens.has(params.providerCallId)).toBe(false);
+  expect(state.twimlStorage.has(params.callId)).toBe(false);
+  expect(state.notifyCalls.has(params.callId)).toBe(false);
+  expect(state.activeStreamCalls.has(params.providerCallId)).toBe(false);
+}
+
 function createContext(rawBody: string, query?: WebhookContext["query"]): WebhookContext {
   return {
     headers: {},
@@ -366,6 +410,55 @@ describe("TwilioProvider", () => {
     expect(nextBody).not.toContain("hold-queue");
   });
 
+  it("releases all provider call state on terminal callbacks and late replays", () => {
+    const provider = createProvider();
+    const callId = "call-terminal";
+    const providerCallId = "CA-terminal";
+    seedTwilioPrivateCallState({ provider, callId, providerCallId });
+    const terminal = createContext(
+      `CallStatus=completed&Direction=outbound-api&CallSid=${providerCallId}`,
+      { callId, type: "status" },
+    );
+
+    const first = provider.parseWebhookEvent(terminal).events[0];
+    expect(first).toMatchObject({
+      type: "call.ended",
+      callId,
+      providerCallId,
+      reason: "completed",
+    });
+    expectTwilioPrivateCallStateReleased({ provider, callId, providerCallId });
+
+    const lateReplay = provider.parseWebhookEvent(terminal).events[0];
+    expect(lateReplay).toMatchObject({
+      type: "call.ended",
+      callId,
+      providerCallId,
+      reason: "completed",
+    });
+    expectTwilioPrivateCallStateReleased({ provider, callId, providerCallId });
+  });
+
+  it("releases all provider call state before repeated explicit hangups", async () => {
+    const provider = createProvider();
+    const callId = "call-hangup";
+    const providerCallId = "CA-hangup";
+    seedTwilioPrivateCallState({ provider, callId, providerCallId });
+    const apiRequest = createApiRequestMock();
+    (
+      provider as unknown as {
+        apiRequest: TwilioApiRequest;
+      }
+    ).apiRequest = apiRequest;
+    const input = { callId, providerCallId, reason: "hangup-bot" as const };
+
+    await provider.hangupCall(input);
+    expectTwilioPrivateCallStateReleased({ provider, callId, providerCallId });
+    await provider.hangupCall(input);
+    expectTwilioPrivateCallStateReleased({ provider, callId, providerCallId });
+    expect(apiRequest).toHaveBeenCalledTimes(2);
+  });
+
   it("QUEUE_TWIML references /voice/hold-music waitUrl", () => {
     const provider = createProvider();
     const firstInbound = createContext("CallStatus=ringing&Direction=inbound&CallSid=CA611");