diff --git a/package.json b/package.json
index e40a6aefe..09f95c1db 100644
--- a/package.json
+++ b/package.json
@@ -126,7 +126,7 @@
     "@playwright/test": "^1.61.1",
     "@rollup/plugin-inject": "^5.0.5",
     "@rollup/plugin-wasm": "^6.2.2",
-    "@sableclient/sable-call-embedded": "1.1.7",
+    "@sableclient/sable-call-embedded": "1.1.8",
     "@sentry/vite-plugin": "^5.3.0",
     "@tauri-apps/cli": "2.11.4",
     "@testing-library/jest-dom": "^6.9.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 73d8ac5e0..1f1b53ebc 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -279,8 +279,8 @@ importers:
         specifier: ^6.2.2
         version: 6.2.2(rollup@4.62.0)
       '@sableclient/sable-call-embedded':
-        specifier: 1.1.7
-        version: 1.1.7
+        specifier: 1.1.8
+        version: 1.1.8
       '@sentry/vite-plugin':
         specifier: ^5.3.0
         version: 5.3.0(rollup@4.62.0)
@@ -2615,8 +2615,8 @@ packages:
     cpu: [x64]
     os: [win32]
 
-  '@sableclient/sable-call-embedded@1.1.7':
-    resolution: {integrity: sha512-I2GSgGSUjY7ytsurTQ7JfBAsO8ZiytniknbNVzJfbN6MQjr69YDmj/UHtB2QUqwPqUmxHVxhtqVTiUgFx0k8mA==}
+  '@sableclient/sable-call-embedded@1.1.8':
+    resolution: {integrity: sha512-+95vxaqTxh5gIrIwMX+FWH4n+K82rv/hlVIO/KIhIl2udJ2+r/GESiAElnTXa1bom1+FWrdekNvkCEEuh7m2Jw==}
 
   '@sableclient/twemoji-font@1.0.4':
     resolution: {integrity: sha512-LzvQB/VZtv5KEq1VYq2azr7v7cYT8oklOVRGkAN2RNwa3sF0XcnqM3lBHSYRFXQleGLSUgs3gA0slbwkD2+sJw==}
@@ -7705,7 +7705,7 @@ snapshots:
   '@rollup/rollup-win32-x64-msvc@4.62.0':
     optional: true
 
-  '@sableclient/sable-call-embedded@1.1.7': {}
+  '@sableclient/sable-call-embedded@1.1.8': {}
 
   '@sableclient/twemoji-font@1.0.4': {}
 
diff --git a/src/app/plugins/call/CallEmbed.intent.test.ts b/src/app/plugins/call/CallEmbed.intent.test.ts
index 815505eeb..4288fc416 100644
--- a/src/app/plugins/call/CallEmbed.intent.test.ts
+++ b/src/app/plugins/call/CallEmbed.intent.test.ts
@@ -95,6 +95,12 @@ describe('CallEmbed.getWidget', () => {
     baseUrl: 'https://matrix.example.com',
     getSafeUserId: () => '@alice:example.com',
     getDeviceId: () => 'ALICEDEVICE',
+    matrixRTC: {
+      getRoomSession: () => ({
+        getOldestMembership: () => undefined,
+        memberships: [],
+      }),
+    },
   } as never;
 
   it('adds ring notification delegation for starting DM calls in non-call rooms', () => {
@@ -173,4 +179,44 @@ describe('CallEmbed.getWidget', () => {
 
     expect(url.searchParams.get('parentUrl')).toBe('https://tauri.localhost');
   });
+
+  it("forwards the ongoing call's livekit transport as livekitServiceUrl param", () => {
+    const oldest = {};
+    const mxWithOngoingCall = {
+      baseUrl: 'https://matrix.example.com',
+      getSafeUserId: () => '@alice:example.com',
+      getDeviceId: () => 'ALICEDEVICE',
+      matrixRTC: {
+        getRoomSession: () => ({
+          getOldestMembership: () => oldest,
+          memberships: [
+            {
+              getTransport: () => ({
+                type: 'livekit',
+                livekit_service_url: 'https://lk.example.org',
+              }),
+            },
+          ],
+        }),
+      },
+    } as never;
+    const room = createRoom(false);
+    const widget = CallEmbed.getWidget(
+      mxWithOngoingCall,
+      room,
+      ElementCallIntent.JoinExisting,
+      'dark'
+    );
+    const url = new URL(widget.getCompleteUrl({ currentUserId: '@alice:example.com' }));
+
+    expect(url.searchParams.get('livekitServiceUrl')).toBe('https://lk.example.org');
+  });
+
+  it('adds no livekitServiceUrl param when there is no ongoing call', () => {
+    const room = createRoom(false);
+    const widget = CallEmbed.getWidget(mx, room, ElementCallIntent.StartCallVoice, 'dark');
+    const url = new URL(widget.getCompleteUrl({ currentUserId: '@alice:example.com' }));
+
+    expect(url.searchParams.get('livekitServiceUrl')).toBeNull();
+  });
 });
diff --git a/src/app/plugins/call/CallEmbed.ts b/src/app/plugins/call/CallEmbed.ts
index 829b06481..8ba2c2787 100644
--- a/src/app/plugins/call/CallEmbed.ts
+++ b/src/app/plugins/call/CallEmbed.ts
@@ -93,6 +93,18 @@ export class CallEmbed {
     );
   }
 
+  // Widget-mode discovery can't reach a transport (no access token, iframe
+  // fetch restrictions), so forward the ongoing call's own transport.
+  private static getOngoingCallLivekitServiceUrl(mx: MatrixClient, room: Room): string | undefined {
+    const session = mx.matrixRTC.getRoomSession(room);
+    const oldest = session.getOldestMembership();
+    if (!oldest) return undefined;
+    const transport = session.memberships.map((m) => m.getTransport(oldest)).find(Boolean);
+    return transport?.type === 'livekit'
+      ? (transport as { livekit_service_url?: string }).livekit_service_url
+      : undefined;
+  }
+
   static getWidget(
     mx: MatrixClient,
     room: Room,
@@ -123,6 +135,11 @@ export class CallEmbed {
       header: 'none',
     });
 
+    const ongoingLivekitServiceUrl = CallEmbed.getOngoingCallLivekitServiceUrl(mx, room);
+    if (ongoingLivekitServiceUrl) {
+      params.append('livekitServiceUrl', ongoingLivekitServiceUrl);
+    }
+
     if (!room.isCallRoom() && CallEmbed.startingCall(intent)) {
       params.append('sendNotificationType', CallEmbed.dmCall(intent) ? 'ring' : 'notification');
       params.append('waitForCallPickup', CallEmbed.dmCall(intent) ? 'true' : 'false');