Remove all references to .well-known transport advertisement

2026-08-14 09:30:17 +00:00 · 2026-08-10 15:10:49 +02:00
parent 7d6a0da6a9
commit 426ea30fe1
18 changed files with 68 additions and 210 deletions
@@ -115,30 +115,33 @@ For more details on the packages, see the
 For operating and deploying Element Call on your own server, refer to the
 [**Self-Hosting Guide**](./docs/self_hosting.md).

-## 🧭 MatrixRTC Backend Discovery and Selection
+## MatrixRTC Transports

-For proper Element Call operation each site deployment needs a MatrixRTC backend
-setup as outlined in the [Self-Hosting Guide](./docs/self_hosting.md). A typical
-federated site deployment for three different sites A, B and C is depicted below.
+For proper operation of Element Call, each deployment needs to set up a
+MatrixRTC transport in the form of a LiveKit server as outlined in the
+[Self-Hosting Guide](./docs/self_hosting.md). A typical federated site
+deployment for three different sites A, B and C is depicted below.

 <p align="center">
  <img src="./docs/Federated_Setup.drawio.png" alt="Element Call federated setup">
 </p>

-### Backend Discovery
+### Transport Discovery

-The MatrixRTC backend (according to
-[MSC4143](https://github.com/matrix-org/matrix-spec-proposals/pull/4143)) is
-announced by the Matrix site's `.well-known/matrix/client` file and discovered
-via the `org.matrix.msc4143.rtc_foci` key, e.g.:
+Element Call discovers the available MatrixRTC transports (as defined by
+[MSC4519](https://github.com/matrix-org/matrix-spec-proposals/pull/4519)) by
+hitting the `GET /_matrix/client/unstable/org.matrix.msc4143/rtc/transports`
+endpoint of the Client-Server API. An example response:

 ```json
-"org.matrix.msc4143.rtc_foci": [
+{
+  "rtc_transports": [
    {
-        "type": "livekit",
-        "livekit_service_url": "https://matrix-rtc.example.com/livekit/jwt"
-    },
-]
+      "type": "livekit",
+      "livekit_service_url": "https://matrix-rtc.example.com/livekit/jwt"
+    }
+  ]
+}
 ```

 where the format for MatrixRTC using LiveKit backend is defined in
@@ -149,7 +152,7 @@ via `livekit_service_url`.

 ### Backend Selection

- Each call participant proposes their discovered MatrixRTC backend from
+- Each call participant proposes their discovered MatrixRTC transport from
  `org.matrix.msc4143.rtc_foci` in their `org.matrix.msc3401.call.member` state event.
 - For the **LiveKit** MatrixRTC backend
  ([MSC4195](https://github.com/hughns/matrix-spec-proposals/blob/hughns/matrixrtc-livekit/proposals/4195-matrixrtc-livekit.md)),
@@ -244,10 +247,9 @@ pnpm backend

 > [!NOTE]
 > To ensure your local development frontend functions properly, you’ll need to
-> add certificate exceptions in your browser for `https://localhost:3000`,
-> `https://matrix-rtc.m.localhost/livekit/jwt/healthz` and
-> `https://synapse.m.localhost/.well-known/matrix/client`. This can be either
-> done by adding the minimum localhost CA
+> add certificate exceptions in your browser for `https://localhost:3000` and
+> `https://matrix-rtc.m.localhost/livekit/jwt/healthz`. This can be done either
+> by adding the minimum localhost CA
 > ([./backend/dev_tls_local-ca.crt](./backend/dev_tls_local-ca.crt)) to your web
 > browser's trusted certificates or by simply copying and pasting each URL into
 > your browser’s address bar and follow the prompts to add the exception.
@@ -54,7 +54,6 @@ enable_registration_without_verification: true
 registration_shared_secret: "test_shared_secret_for_local_dev_only"

 report_stats: false
-serve_server_wellknown: true

 # Ratelimiting settings for client actions (registration, login, messaging).
 #
@@ -54,7 +54,6 @@ enable_registration_without_verification: true
 registration_shared_secret: "test_shared_secret_for_local_dev_only"

 report_stats: false
-serve_server_wellknown: true

 # Ratelimiting settings for client actions (registration, login, messaging).
 #
@@ -1,4 +1,4 @@
-# Synapse reverse proxy including .well-known/matrix/client
+# Synapse reverse proxy
 # domain synapse.m.localhost
 server {
    listen                  80;
@@ -11,18 +11,6 @@ server {
    ssl_certificate         /root/ssl/cert.pem;
    ssl_certificate_key     /root/ssl/key.pem;

-    # well-known config adding rtc_foci backend
-    # Note well-known is currently not effective due to:
-    # https://spec.matrix.org/v1.12/client-server-api/#well-known-uri the spec
-    # says it must be at https://$server_name/... (implied port 443) Hence, we
-    # currently rely for local development environment on deprecated config.json
-    # setting for livekit_service_url
-    location /.well-known/matrix/client {
-        add_header Access-Control-Allow-Origin *;
-        return 200 '{"m.homeserver": {"base_url": "https://synapse.m.localhost"}, "org.matrix.msc4143.rtc_foci": [{"type": "livekit", "livekit_service_url": "https://matrix-rtc.m.localhost/livekit/jwt"}]}';
-        default_type application/json;
-    }
-
    # Reverse proxy for Matrix Synapse Homeserver
    # This is also required for development environment.
    # Reason: the lk-jwt-service uses the federation API for the openid token
@@ -44,7 +32,7 @@ server {

 }

-# Synapse reverse proxy including .well-known/matrix/client
+# Synapse reverse proxy
 # domain synapse.othersite.m.localhost
 server {
    listen                  80;
@@ -57,18 +45,6 @@ server {
    ssl_certificate         /root/ssl/cert.pem;
    ssl_certificate_key     /root/ssl/key.pem;

-    # well-known config adding rtc_foci backend
-    # Note well-known is currently not effective due to:
-    # https://spec.matrix.org/v1.12/client-server-api/#well-known-uri the spec
-    # says it must be at https://$server_name/... (implied port 443) Hence, we
-    # currently rely for local development environment on deprecated config.json
-    # setting for livekit_service_url
-    location /.well-known/matrix/client {
-        add_header Access-Control-Allow-Origin *;
-        return 200 '{"m.homeserver": {"base_url": "https://synapse.othersite.m.localhost"}, "org.matrix.msc4143.rtc_foci": [{"type": "livekit", "livekit_service_url": "https://matrix-rtc.othersite.m.localhost/livekit/jwt"}]}';
-        default_type application/json;
-    }
-
    # Reverse proxy for Matrix Synapse Homeserver
    # This is also required for development environment.
    # Reason: the lk-jwt-service uses the federation API for the openid token
@@ -54,7 +54,6 @@ enable_registration_without_verification: true
 registration_shared_secret: "test_shared_secret_for_local_dev_only"

 report_stats: false
-serve_server_wellknown: true

 # Ratelimiting settings for client actions (registration, login, messaging).
 #
@@ -54,7 +54,6 @@ enable_registration_without_verification: true
 registration_shared_secret: "test_shared_secret_for_local_dev_only"

 report_stats: false
-serve_server_wellknown: true

 # Ratelimiting settings for client actions (registration, login, messaging).
 #
@@ -68,10 +68,10 @@ As a prerequisite for the
 make sure that your Synapse server has either a `federation` or `openid`
 [listener configured](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#listeners).

-### MatrixRTC Backend
+### LiveKit backend

-In order to **guarantee smooth operation** of Element Call, a MatrixRTC backend is
-required for each site deployment.
+In order to **guarantee smooth operation** of Element Call, a dedicated LiveKit
+backend is required for each site deployment.

 ![MSC4195 compatible setup](MSC4195_setup.drawio.png)

@@ -165,7 +165,7 @@ Using Haproxy, you can achieve this by:
    use_backend mxrtc_auth_backend if is_mxrtc_auth matrixrtc_domain

 # Backend
-## MatrixRTC backend
+## LiveKit backend
 backend sfu_backend
    server livekit 127.0.0.1:7880
    http-request set-path %[path,regsub(^/livekit/sfu/,/)]
@@ -187,57 +187,22 @@ backend mxrtc_auth_backend

 ```

-#### MatrixRTC backend announcement
+#### MatrixRTC transport announcement

-> [!IMPORTANT]
-> As defined in
-> [MSC4143](https://github.com/matrix-org/matrix-spec-proposals/pull/4143),
-> the MatrixRTC backend(s) must be announced to the client via `/_matrix/client/unstable/org.matrix.msc4143/rtc/transports`.
-
-Enable the unstable feature flag `msc4143_enabled`, and update the synapse config file:
+Enable the unstable feature flag `msc4143_enabled`, and update the
+[`matrix_rtc` section](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#matrix_rtc)
+of your Synapse config file:

 ```yaml
-
 matrix_rtc:
-  - transports:
-  - type: livekit
-    livekit_service_url: https://matrix-rtc.example.com/livekit/jwt
+  transports:
+    - type: livekit
+      livekit_service_url: https://matrix-rtc.example.com/livekit/jwt
 ```

-
-
-**⚠️ Well-known discovery will soon be deprecated, but needed if MSC4143 is not supported on your Homeserver**
-
-your **Matrix site's .well-known/matrix/client`** file (e.g. `example.com/.well-known/matrix/client` matching the site deployment example
-from above). The configuration is a list of Foci configs:
-
-```json
-"org.matrix.msc4143.rtc_foci": [
-    {
-        "type": "livekit",
-        "livekit_service_url": "https://matrix-rtc.example.com/livekit/jwt"
-    },
-    {
-        "type": "livekit",
-        "livekit_service_url": "https://matrix-rtc-2.example.com/livekit/jwt"
-    }
-]
-```
-
-Make sure this file is served with the correct MIME type (`application/json`).
-Additionally, ensure the appropriate CORS headers are set to allow web clients
-to access it across origins. For more details, refer to the
-[Matrix Client-Server API: 2. Web Browser Clients](https://spec.matrix.org/latest/client-server-api/#web-browser-clients).
-
-```
-Access-Control-Allow-Origin: *
-Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
-Access-Control-Allow-Headers: X-Requested-With, Content-Type, Authorization
-```
-
-> [!NOTE]  
-> Most `org.matrix.msc4143.rtc_foci` configurations will only have one entry in
-> the array.
+The transport you specify will be made available to clients over the
+`/_matrix/client/unstable/org.matrix.msc4143/rtc/transports` endpoint as defined
+in [MSC4143](https://github.com/matrix-org/matrix-spec-proposals/pull/4143).

 ## Building Element Call

@@ -292,7 +257,7 @@ runtime. Documentation and default values for `public/config.json` can be found
 in [ConfigOptions.ts](../src/config/ConfigOptions.ts).

 > [!CAUTION]
-> Please note configuring MatrixRTC backend via `config.json` of
+> Please note configuring LiveKit backend via `config.json` of
 > Element Call is only available for developing and debug purposes. Relying on
 > it might break Element Call going forward!

@@ -61,7 +61,7 @@
    "crypto_version": "Crypto version: {{version}}",
    "custom_livekit_url": {
      "current_url": "Currently set to: ",
-      "from_config": "Currently, no overwrite is set. Url from well-known or config is used.",
+      "from_config": "Currently, no overwrite is set. Url from config is used.",
      "label": "Custom Livekit-url",
      "reset": "Reset overwrite",
      "save": "Save",
@@ -74,10 +74,7 @@ export interface ConfigOptions {
  livekit?: {
    // The link to the service that returns a livekit url and token to use it.
    // This is a fallback link in case the homeserver in use does not advertise
-    // a livekit service url in the client well-known.
-    // The well known needs to be formatted like so:
-    // {"type":"livekit", "livekit_service_url":"https://livekit.example.com"}
-    // and stored under the key: "org.matrix.msc4143.rtc_foci"
+    // a livekit service url over the transports endpoint.
    livekit_service_url: string;
  };

@@ -251,7 +251,7 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
        class="_message_1o4d9_86 _help-message_1o4d9_92"
        id="radix-_r_8_"
      >
-        Currently, no overwrite is set. Url from well-known or config is used.
+        Currently, no overwrite is set. Url from config is used.
      </span>
    </div>
  </form>
@@ -20,7 +20,6 @@ import {
  afterAll,
  beforeEach,
 } from "vitest";
-import { AutoDiscovery } from "matrix-js-sdk/lib/autodiscovery";
 import { BehaviorSubject, map, of } from "rxjs";
 import { logger } from "matrix-js-sdk/lib/logger";
 import { type LocalParticipant, type LocalTrack } from "livekit-client";
@@ -78,34 +77,10 @@ describe("LocalMembership", () => {
        livekit_alias: "my-oldest-member-service-alias",
      };

-      const focusConfigFromWellKnown = {
-        type: "livekit",
-        livekit_service_url: "http://my-well-known-service-url.com",
-      };
-      const focusConfigFromWellKnown2 = {
-        type: "livekit",
-        livekit_service_url: "http://my-well-known-service-url2.com",
-      };
-      const clientWellKnown = {
-        "org.matrix.msc4143.rtc_foci": [
-          focusConfigFromWellKnown,
-          focusConfigFromWellKnown2,
-        ],
-      };
-
      mockConfig({
        livekit: { livekit_service_url: "http://my-default-service-url.com" },
      });

-      vi.spyOn(AutoDiscovery, "getRawClientConfig").mockImplementation(
-        async (domain) => {
-          if (domain === "example.org") {
-            return Promise.resolve(clientWellKnown);
-          }
-          return Promise.resolve({});
-        },
-      );
-
      const mockedSession = vi.mocked({
        room: {
          roomId: "roomId",
@@ -132,7 +107,7 @@ describe("LocalMembership", () => {
        ownMemberMock,
        {
          livekit_alias: "roomId",
-          livekit_service_url: "http://my-well-known-service-url.com",
+          livekit_service_url: "http://my-livekit-service-url.com",
          type: "livekit",
        },
        {
@@ -150,7 +125,7 @@ describe("LocalMembership", () => {
        [
          {
            livekit_alias: "roomId",
-            livekit_service_url: "http://my-well-known-service-url.com",
+            livekit_service_url: "http://my-livekit-service-url.com",
            type: "livekit",
          },
        ],
@@ -161,50 +136,6 @@ describe("LocalMembership", () => {
        }),
      );
    });
-
-    it("It should not fail with configuration error if homeserver config has livekit url but not fallback", () => {
-      mockConfig({});
-      vi.spyOn(AutoDiscovery, "getRawClientConfig").mockResolvedValue({
-        "org.matrix.msc4143.rtc_foci": [
-          {
-            type: "livekit",
-            livekit_service_url: "http://my-well-known-service-url.com",
-          },
-        ],
-      });
-
-      const mockedSession = vi.mocked({
-        room: {
-          roomId: "roomId",
-          client: {
-            getDomain: vi.fn().mockReturnValue("example.org"),
-            getOpenIdToken: vi.fn().mockResolvedValue({
-              access_token: "ACCCESS_TOKEN",
-              token_type: "Bearer",
-              matrix_server_name: "localhost",
-              expires_in: 10000,
-            }),
-          },
-        },
-        memberships: [],
-        getFocusInUse: vi.fn(),
-        joinRTCSession: vi.fn(),
-      }) as unknown as MatrixRTCSession;
-
-      enterRTCSession(
-        mockedSession,
-        ownMemberMock,
-        {
-          livekit_alias: "roomId",
-          livekit_service_url: "http://my-well-known-service-url.com",
-          type: "livekit",
-        },
-        {
-          encryptMedia: true,
-          matrixRTCMode: MATRIX_RTC_MODE,
-        },
-      );
-    });
  });

  const defaultCreateLocalMemberValues = {
@@ -108,7 +108,6 @@ export type LocalMemberState =
    };

 /*
- * - get well known
 * - get oldest membership
 * - get transport to use
 * - get openId + jwt token
@@ -63,8 +63,7 @@ describe("LocalTransport", () => {
      client: {
        // eslint-disable-next-line @typescript-eslint/naming-convention
        _unstable_getRTCTransports: async () => Promise.resolve([]),
-        getAccessToken: vi.fn().mockReturnValue("access_token"),
-        getDomain: () => "",
+        getDomain: () => "example.org",
        baseUrl: "example.org",
        // These won't be called in this error path but satisfy the type
        getOpenIdToken: vi.fn(),
@@ -77,9 +76,11 @@ describe("LocalTransport", () => {
    await flushPromises();

    expect(() => advertised$.value).toThrow(
-      new MatrixRTCTransportMissingError(""),
+      new MatrixRTCTransportMissingError("example.org"),
+    );
+    expect(() => active$.value).toThrow(
+      new MatrixRTCTransportMissingError("example.org"),
    );
-    expect(() => active$.value).toThrow(new MatrixRTCTransportMissingError(""));
  });

  it("throws FailToGetOpenIdToken when OpenID fetch fails", async () => {
@@ -103,10 +104,8 @@ describe("LocalTransport", () => {
      useOldestMember: false,
      memberships$: constant(new Epoch<CallMembership[]>([])),
      client: {
-        baseUrl: "https://lk.example.org",
-        // Use empty domain to skip .well-known and use config directly
-        getDomain: () => "",
-        getAccessToken: vi.fn().mockReturnValue("access_token"),
+        baseUrl: "https://example.org",
+        getDomain: () => "example.org",
        // eslint-disable-next-line @typescript-eslint/naming-convention
        _unstable_getRTCTransports: async () => Promise.resolve([]),
        getOpenIdToken: vi.fn(),
@@ -150,11 +149,10 @@ describe("LocalTransport", () => {
      client: {
        // eslint-disable-next-line @typescript-eslint/naming-convention
        _unstable_getRTCTransports: async () => Promise.resolve([]),
-        getDomain: () => "",
+        getDomain: () => "example.org",
        getOpenIdToken: vi.fn(),
        getDeviceId: vi.fn(),
-        baseUrl: "https://lk.example.org",
-        getAccessToken: vi.fn().mockReturnValue("access_token"),
+        baseUrl: "https://example.org",
      },
      ownMembershipIdentity: ownMemberMock,
      forceJwtEndpoint: JwtEndpointVersion.Legacy,
@@ -221,13 +219,12 @@ describe("LocalTransport", () => {
        useOldestMember: true,
        memberships$: scope.behavior(memberships$.pipe(trackEpoch())),
        client: {
-          getDomain: () => "",
+          getDomain: () => "example.org",
          // eslint-disable-next-line @typescript-eslint/naming-convention
          _unstable_getRTCTransports: async () => Promise.resolve([]),
-          getAccessToken: vi.fn().mockReturnValue("access_token"),
          getOpenIdToken: vi.fn(),
          getDeviceId: vi.fn(),
-          baseUrl: "https://lk.example.org",
+          baseUrl: "https://example.org",
        },
        ownMembershipIdentity: ownMemberMock,
        forceJwtEndpoint: JwtEndpointVersion.Legacy,
@@ -278,14 +275,13 @@ describe("LocalTransport", () => {
        useOldestMember: true,
        memberships$: scope.behavior(memberships$.pipe(trackEpoch())),
        client: {
-          getDomain: () => "",
+          getDomain: () => "example.org",
          // eslint-disable-next-line @typescript-eslint/naming-convention
          _unstable_getRTCTransports: async () =>
            Promise.resolve([aliceTransport]),
-          getAccessToken: vi.fn().mockReturnValue("access_token"),
          getOpenIdToken: vi.fn(),
          getDeviceId: vi.fn(),
-          baseUrl: "https://lk.example.org",
+          baseUrl: "https://example.org",
        },
        ownMembershipIdentity: ownMemberMock,
        forceJwtEndpoint: JwtEndpointVersion.Legacy,
@@ -330,10 +326,9 @@ describe("LocalTransport", () => {
        memberships$: constant(new Epoch<CallMembership[]>([])),
        client: {
          baseUrl: "https://example.org",
-          getDomain: vi.fn().mockReturnValue(""),
+          getDomain: vi.fn().mockReturnValue("example.org"),
          // eslint-disable-next-line @typescript-eslint/naming-convention
          _unstable_getRTCTransports: vi.fn().mockResolvedValue([]),
-          getAccessToken: vi.fn().mockReturnValue("access_token"),
          getOpenIdToken: vi.fn(),
          getDeviceId: vi.fn(),
        },
@@ -443,11 +438,10 @@ describe("LocalTransport", () => {
        delayId$: constant(null),
        memberships$: constant(new Epoch<CallMembership[]>([])),
        client: {
-          getDomain: () => "",
+          getDomain: () => "example.org",
          baseUrl: "https://example.org",
          // eslint-disable-next-line @typescript-eslint/naming-convention
          _unstable_getRTCTransports: async () => Promise.resolve([]),
-          getAccessToken: vi.fn().mockReturnValue("access_token"),
          // These won't be called in this error path but satisfy the type
          getOpenIdToken: vi.fn(),
          getDeviceId: vi.fn(),
@@ -456,10 +450,10 @@ describe("LocalTransport", () => {
      await flushPromises();

      expect(() => advertised$.value).toThrow(
-        new MatrixRTCTransportMissingError(""),
+        new MatrixRTCTransportMissingError("example.org"),
      );
      expect(() => active$.value).toThrow(
-        new MatrixRTCTransportMissingError(""),
+        new MatrixRTCTransportMissingError("example.org"),
      );
    });
  });
@@ -484,11 +478,10 @@ describe("LocalTransport", () => {
      delayId$: delayId$,
      memberships$: constant(new Epoch<CallMembership[]>([])),
      client: {
-        getDomain: () => "",
+        getDomain: () => "example.org",
        baseUrl: "https://example.org",
        // eslint-disable-next-line @typescript-eslint/naming-convention
        _unstable_getRTCTransports: async () => Promise.resolve([]),
-        getAccessToken: vi.fn().mockReturnValue("access_token"),
        // These won't be called in this error path but satisfy the type
        getOpenIdToken: vi.fn(),
        getDeviceId: vi.fn(),
@@ -56,7 +56,7 @@ interface Props {
  memberships$: Behavior<Epoch<CallMembership[]>>;
  client: Pick<
    MatrixClient,
-    "getDomain" | "baseUrl" | "_unstable_getRTCTransports" | "getAccessToken"
+    "getDomain" | "baseUrl" | "_unstable_getRTCTransports"
  > &
    OpenIDClientParts;
  // Used by the jwt service to create the livekit room and compute the livekit alias.
@@ -307,7 +307,7 @@ async function doOpenIdAndJWTFromUrl(
  roomId: string,
  client: Pick<
    MatrixClient,
-    "getDomain" | "baseUrl" | "_unstable_getRTCTransports" | "getAccessToken"
+    "getDomain" | "baseUrl" | "_unstable_getRTCTransports"
  > &
    OpenIDClientParts,
  delayId?: string,
@@ -337,7 +337,7 @@ function observeLocalTransportForOldestMembership(
  preferredTransport$: Observable<LocalTransportWithSFUConfig>,
  client: Pick<
    MatrixClient,
-    "getDomain" | "baseUrl" | "_unstable_getRTCTransports" | "getAccessToken"
+    "getDomain" | "baseUrl" | "_unstable_getRTCTransports"
  > &
    OpenIDClientParts,
  ownMembershipIdentity: CallMembershipIdentityParts,
@@ -71,7 +71,6 @@ describe("RtcTransportAutoDiscovery", () => {
  it.each(VALID_TEST_CASES)(
    "prefers backend transport other app config $transports",
    async ({ transports }) => {
-      // it("prefers backend transport over well-known and app config", async () => {
      const client = makeClient();
      client._unstable_getRTCTransports.mockResolvedValue(transports);

@@ -16,7 +16,7 @@ import { doNetworkOperationWithRetry } from "../../../utils/matrix.ts";

 type TransportDiscoveryClient = Pick<
  MatrixClient,
-  "getDomain" | "_unstable_getRTCTransports" | "getAccessToken"
+  "getDomain" | "_unstable_getRTCTransports"
 >;

 export interface RtcTransportAutoDiscoveryProps {
@@ -12,7 +12,7 @@ import { i18nKey } from "./i18n";

 export enum ErrorCode {
  /**
-   * Configuration problem due to no MatrixRTC backend/SFU is exposed via .well-known and no fallback configured.
+   * Configuration problem due to no MatrixRTC transport provided by homeserver and no fallback configured.
   */
  MISSING_MATRIX_RTC_TRANSPORT = "MISSING_MATRIX_RTC_TRANSPORT",
  CONNECTION_LOST_ERROR = "CONNECTION_LOST_ERROR",
@@ -67,7 +67,7 @@ export class ElementCallError extends Error {
 }

 /**
- * Configuration problem due to no MatrixRTC backend/SFU is exposed via .well-known and no fallback configured.
+ * Configuration problem due to no MatrixRTC transport provided by homeserver and no fallback configured.
 */
 export class MatrixRTCTransportMissingError extends ElementCallError {
  public domain: string;
@@ -195,7 +195,7 @@ export const initializeWidget = (
        // Wait for the config file to be ready (we load very early on so it might not
        // be otherwise)
        await Config.init();
-        await client.startClient({ clientWellKnownPollPeriod: 60 * 10 });
+        await client.startClient();
        return client;
      };