diff --git a/scripts/windows-smoke.mjs b/scripts/windows-smoke.mjs
index a757340..1808d1b 100644
--- a/scripts/windows-smoke.mjs
+++ b/scripts/windows-smoke.mjs
@@ -11,6 +11,7 @@
 // instead of failing, so the same script runs on main and on PR branches.
 import { writeFileSync, mkdirSync } from 'node:fs';
 import { execSync } from 'node:child_process';
+import { createServer } from 'node:http';
 import { chromium } from 'playwright-core';
 
 const OUT = process.argv[2] || 'smoke-out';
@@ -150,21 +151,38 @@ else if (!kc.supported) record('keychain round trip', 'fail', 'secure_session_su
 else record('keychain round trip', kc.roundTrip && kc.restored ? 'pass' : 'fail', JSON.stringify(kc));
 
 // 7. A foreign page loaded in the window must not get the microphone (#22).
-await page.goto('https://example.com/').catch(() => undefined);
-const foreignMic = await page.evaluate(async () => {
-  try {
-    const s = await navigator.mediaDevices.getUserMedia({ audio: true });
-    s.getTracks().forEach((t) => t.stop());
-    return 'ok';
-  } catch (e) {
-    return e.name;
-  }
+// Served locally on another port (a different origin, still a secure context),
+// so the check doesn't depend on the runner reaching the internet.
+const foreign = createServer((_, res) => {
+  res.writeHead(200, { 'Content-Type': 'text/html' });
+  res.end('<!doctype html><title>foreign</title>foreign page');
 });
-record(
-  'microphone refused to a foreign page',
-  foreignMic === 'NotAllowedError' ? 'pass' : 'info',
-  `${foreignMic}${foreignMic === 'ok' ? ' (build without the #22 origin check)' : ''}`,
-);
+await new Promise((r) => foreign.listen(9333, '127.0.0.1', r));
+const FOREIGN = 'http://localhost:9333/';
+await page.goto(FOREIGN).catch(() => undefined);
+if (!page.url().startsWith(FOREIGN)) {
+  record('microphone refused to a foreign page', 'fail', `navigation did not happen (at ${page.url()})`);
+} else {
+  const foreignMic = await page.evaluate(async () => {
+    try {
+      const s = await navigator.mediaDevices.getUserMedia({ audio: true });
+      s.getTracks().forEach((t) => t.stop());
+      return 'ok';
+    } catch (e) {
+      return e.name;
+    }
+  });
+  const guarded = cfg.desktopCallOrigin !== undefined; // builds with #22 also carry #43
+  let status = 'info';
+  if (foreignMic === 'NotAllowedError') status = 'pass';
+  else if (guarded) status = 'fail';
+  record(
+    'microphone refused to a foreign page',
+    status,
+    `${foreignMic} at ${page.url()}${status === 'info' ? ' (build without the #22 origin check)' : ''}`,
+  );
+}
+foreign.close();
 await page.goto(APP).catch(() => undefined);
 await page.screenshot({ path: `${OUT}/02-end.png` }).catch(() => undefined);