diff --git a/extensions/voice-call/src/manager/events.test.ts b/extensions/voice-call/src/manager/events.test.ts
index d4af5da72c0e..070f74be0448 100644
--- a/extensions/voice-call/src/manager/events.test.ts
+++ b/extensions/voice-call/src/manager/events.test.ts
@@ -15,8 +15,9 @@ import type { AnswerCallInput, HangupCallInput, NormalizedEvent } from "../types
 import type { CallManagerContext } from "./context.js";
 import { processEvent } from "./events.js";
 import { speakInitialMessage } from "./outbound.js";
-import { MAX_CALL_REPLAY_KEYS, MAX_MANAGER_REPLAY_KEYS } from "./replay-keys.js";
+import { MAX_CALL_REPLAY_KEYS } from "./replay-keys.js";
 
+const MANAGER_REPLAY_KEY_LIMIT = 10_000;
 const logSpy = vi.hoisted(() => {
   const logEntries: string[] = [];
   return {
@@ -775,7 +776,7 @@ describe("processEvent (functional)", () => {
   it("bounds committed replay keys in both manager and persisted call owners", () => {
     const now = Date.now();
     const managerKeys = Array.from(
-      { length: MAX_MANAGER_REPLAY_KEYS },
+      { length: MANAGER_REPLAY_KEY_LIMIT },
       (_, index) => `manager-${index}`,
     );
     const callKeys = Array.from({ length: MAX_CALL_REPLAY_KEYS }, (_, index) => `call-${index}`);
@@ -806,7 +807,7 @@ describe("processEvent (functional)", () => {
 
     const call = ctx.activeCalls.get("call-bounded");
     expect(result).toEqual({ kind: "processed" });
-    expect(ctx.processedEventIds.size).toBe(MAX_MANAGER_REPLAY_KEYS);
+    expect(ctx.processedEventIds.size).toBe(MANAGER_REPLAY_KEY_LIMIT);
     expect(ctx.processedEventIds.has("manager-0")).toBe(false);
     expect(ctx.processedEventIds.has("evt-bounded-new")).toBe(true);
     expect(call?.processedEventIds).toHaveLength(MAX_CALL_REPLAY_KEYS);
@@ -827,7 +828,7 @@ describe("processEvent (functional)", () => {
   it("bounds rejected provider calls while retaining hangup-once behavior", () => {
     const rejectedProviderCallIds = new Map<string, symbol>(
       Array.from(
-        { length: MAX_MANAGER_REPLAY_KEYS },
+        { length: MANAGER_REPLAY_KEY_LIMIT },
         (_, index) => [`provider-${index}`, Symbol(`provider-${index}`)] as const,
       ),
     );
@@ -851,7 +852,7 @@ describe("processEvent (functional)", () => {
       }),
     );
 
-    expect(ctx.rejectedProviderCallIds.size).toBe(MAX_MANAGER_REPLAY_KEYS);
+    expect(ctx.rejectedProviderCallIds.size).toBe(MANAGER_REPLAY_KEY_LIMIT);
     expect(ctx.rejectedProviderCallIds.has("provider-0")).toBe(false);
     expect(ctx.rejectedProviderCallIds.has("provider-new")).toBe(true);
     expect(hangupCalls).toHaveLength(1);
diff --git a/extensions/voice-call/src/manager/replay-keys.ts b/extensions/voice-call/src/manager/replay-keys.ts
index f820beab1348..93ad5a9ce87f 100644
--- a/extensions/voice-call/src/manager/replay-keys.ts
+++ b/extensions/voice-call/src/manager/replay-keys.ts
@@ -1,7 +1,7 @@
 // Voice Call manager helpers own bounded webhook replay identity.
 
 /** Match the existing voice-call webhook replay-cache cardinality. */
-export const MAX_MANAGER_REPLAY_KEYS = 10_000;
+const MAX_MANAGER_REPLAY_KEYS = 10_000;
 /** Keep typical provider replay IDs near one raw persisted-record chunk. */
 export const MAX_CALL_REPLAY_KEYS = 500;
 
diff --git a/extensions/voice-call/src/manager/store.test.ts b/extensions/voice-call/src/manager/store.test.ts
index a1676d08e1cb..203fe0c87d7b 100644
--- a/extensions/voice-call/src/manager/store.test.ts
+++ b/extensions/voice-call/src/manager/store.test.ts
@@ -14,7 +14,7 @@ import {
 } from "../manager.test-harness.js";
 import { setVoiceCallStateRuntime } from "../runtime-state.js";
 import { CallRecordSchema } from "../types.js";
-import { MAX_CALL_REPLAY_KEYS, MAX_MANAGER_REPLAY_KEYS } from "./replay-keys.js";
+import { MAX_CALL_REPLAY_KEYS } from "./replay-keys.js";
 import {
   findCallMatchesInStore,
   getCallHistoryFromStore,
@@ -22,6 +22,8 @@ import {
   persistCallRecord,
 } from "./store.js";
 
+const MANAGER_REPLAY_KEY_LIMIT = 10_000;
+
 function installStateRuntime(): void {
   setVoiceCallStateRuntime({
     state: {
@@ -191,7 +193,7 @@ describe("voice-call call record store", () => {
     );
     for (
       let callIndex = 0;
-      callIndex < MAX_MANAGER_REPLAY_KEYS / MAX_CALL_REPLAY_KEYS;
+      callIndex < MANAGER_REPLAY_KEY_LIMIT / MAX_CALL_REPLAY_KEYS;
       callIndex++
     ) {
       persistCallRecord(
@@ -221,7 +223,7 @@ describe("voice-call call record store", () => {
 
     const restored = loadActiveCallsFromStore(storePath);
 
-    expect(restored.processedEventIds.size).toBe(MAX_MANAGER_REPLAY_KEYS);
+    expect(restored.processedEventIds.size).toBe(MANAGER_REPLAY_KEY_LIMIT);
     expect(restored.processedEventIds.has("evt-latest-old")).toBe(true);
     expect(restored.processedEventIds.has("evt-latest-new")).toBe(true);
     expect(restored.processedEventIds.has("evt-fill-0-0")).toBe(false);