diff --git a/hooks/useRoom.ts b/hooks/useRoom.ts
index 25e023a88..86f82ff45 100644
--- a/hooks/useRoom.ts
+++ b/hooks/useRoom.ts
@@ -253,7 +253,9 @@ export function useRoom(appConfig: AppConfig) {
       }
     };
     const usesManagedRoomInput = browserSourceClient.enabled || appConfig.usesServerRoomInput;
-    const usesSandboxConcurrentStartup = Boolean(appConfig.sandboxId) && usesManagedRoomInput;
+    const usesConcurrentManagedStartup =
+      browserSourceClient.enabled ||
+      (Boolean(appConfig.sandboxId) && appConfig.usesServerRoomInput);
 
     try {
       await waitForAgentSessionStop();
@@ -266,7 +268,7 @@ export function useRoom(appConfig: AppConfig) {
         recordFrontendObservability(FRONTEND_EVENTS.ROOM_CONNECT_FINISHED);
         recordFrontendObservability(FRONTEND_EVENTS.ROOM_CONNECTED);
         connectedRoomName = room.name;
-        if (usesSandboxConcurrentStartup) {
+        if (usesConcurrentManagedStartup) {
           const [localInputResult, dispatchResult] = await Promise.allSettled([
             startLocalInputOrCancelDispatch(),
             dispatchAgentSession(),
@@ -299,7 +301,7 @@ export function useRoom(appConfig: AppConfig) {
         ]);
       }
 
-      if (!usesSandboxConcurrentStartup) {
+      if (!usesConcurrentManagedStartup) {
         await dispatchAgentSession();
       }
       setIsSessionActive(true);
diff --git a/tests/browser-room-session.test.mjs b/tests/browser-room-session.test.mjs
index f94dba1b5..e19d1ab0c 100644
--- a/tests/browser-room-session.test.mjs
+++ b/tests/browser-room-session.test.mjs
@@ -133,7 +133,7 @@ test('ending a voice session clears the reusable session id', async () => {
   assert.doesNotMatch(useRoomSource, /if \(appConfig\.usesBrowserRawMediaInput\)/);
 });
 
-test('sandbox browser starts media and dispatch concurrently without changing local order', async () => {
+test('browser input starts media and dispatch concurrently', async () => {
   const useRoomSource = await readFile(new URL('../hooks/useRoom.ts', import.meta.url), 'utf8');
   const browserSourceSource = await readFile(
     new URL('../hooks/useBrowserSourceClient.ts', import.meta.url),
@@ -146,7 +146,7 @@ test('sandbox browser starts media and dispatch concurrently without changing lo
   );
   assert.match(
     useRoomSource,
-    /usesSandboxConcurrentStartup = Boolean\(appConfig\.sandboxId\) && usesManagedRoomInput/
+    /usesConcurrentManagedStartup =\s*browserSourceClient\.enabled \|\|\s*\(Boolean\(appConfig\.sandboxId\) && appConfig\.usesServerRoomInput\)/
   );
   assert.match(
     useRoomSource,
diff --git a/tests/session-start-dispatch.test.mjs b/tests/session-start-dispatch.test.mjs
index eba6d783f..a3fe9d830 100644
--- a/tests/session-start-dispatch.test.mjs
+++ b/tests/session-start-dispatch.test.mjs
@@ -217,6 +217,28 @@ test('start call dispatches the agent with a cancellable room session id', async
   assert.doesNotMatch(useRoomSource, /requestAgentSessionDispatch\(\s*room\.name,/);
 });
 
+test('browser input starts capture and agent dispatch concurrently outside sandbox', async () => {
+  const useRoomSource = await readFile(new URL('../hooks/useRoom.ts', import.meta.url), 'utf8');
+
+  assert.match(
+    useRoomSource,
+    /const usesConcurrentManagedStartup =\s*browserSourceClient\.enabled \|\|/
+  );
+  assert.match(
+    useRoomSource,
+    /if \(usesConcurrentManagedStartup\) \{[\s\S]*?Promise\.allSettled\(\[[\s\S]*?startLocalInputOrCancelDispatch\(\),[\s\S]*?dispatchAgentSession\(\),/
+  );
+});
+
+test('sandbox server-managed input keeps concurrent dispatch startup', async () => {
+  const useRoomSource = await readFile(new URL('../hooks/useRoom.ts', import.meta.url), 'utf8');
+
+  assert.match(
+    useRoomSource,
+    /usesConcurrentManagedStartup =\s*browserSourceClient\.enabled \|\|\s*\(Boolean\(appConfig\.sandboxId\) && appConfig\.usesServerRoomInput\)/
+  );
+});
+
 test('connection details request uses the same canonical session id as dispatch', async () => {
   const useRoomSource = await readFile(new URL('../hooks/useRoom.ts', import.meta.url), 'utf8');