diff --git a/src/Notifier.ts b/src/Notifier.ts
index aa68b386a3..e502585df3 100644
--- a/src/Notifier.ts
+++ b/src/Notifier.ts
@@ -25,7 +25,11 @@ import {
 } from "matrix-js-sdk/src/matrix";
 import { logger } from "matrix-js-sdk/src/logger";
 import { type PermissionChanged as PermissionChangedEvent } from "@matrix-org/analytics-events/types/typescript/PermissionChanged";
-import { type IRTCNotificationContent, MatrixRTCSession } from "matrix-js-sdk/src/matrixrtc";
+import {
+    DefaultCallApplicationSlot,
+    type IRTCNotificationContent,
+    MatrixRTCSession,
+} from "matrix-js-sdk/src/matrixrtc";
 
 import { MatrixClientPeg } from "./MatrixClientPeg";
 import { PosthogAnalytics } from "./PosthogAnalytics";
@@ -487,7 +491,10 @@ class NotifierClass extends TypedEventEmitter<keyof EmittedEvents, EmittedEvents
         const cli = MatrixClientPeg.safeGet();
         const room = cli.getRoom(ev.getRoomId());
         const thisUserHasConnectedDevice =
-            room && MatrixRTCSession.callMembershipsForRoom(room).some((m) => m.sender === cli.getUserId());
+            room &&
+            MatrixRTCSession.sessionMembershipsForSlot(room, DefaultCallApplicationSlot).some(
+                (m) => m.sender === cli.getUserId(),
+            );
 
         if (EventType.RTCNotification === ev.getType() && !thisUserHasConnectedDevice) {
             const content = ev.getContent() as IRTCNotificationContent;
diff --git a/src/components/views/settings/tabs/room/RolesRoomSettingsTab.tsx b/src/components/views/settings/tabs/room/RolesRoomSettingsTab.tsx
index a7e0e3755b..82f01d1525 100644
--- a/src/components/views/settings/tabs/room/RolesRoomSettingsTab.tsx
+++ b/src/components/views/settings/tabs/room/RolesRoomSettingsTab.tsx
@@ -296,8 +296,12 @@ export default class RolesRoomSettingsTab extends React.Component<IProps, RolesR
             "im.vector.modular.widgets": isSpaceRoom ? null : _td("room_settings|permissions|m.widget"),
         };
 
-        // MSC3401: Native Group VoIP signaling
-        if (SettingsStore.getValue("feature_group_calls")) {
+        if (SettingsStore.getValue("feature_element_call_nextgen")) {
+            // MSC4143: Matrix RTC Slots
+            plEventsToLabels[EventType.RTCSlot] = _td("room_settings|permissions|m.rtc.slot");
+        }
+        else if (SettingsStore.getValue("feature_group_calls")) {
+            // MSC3401: Native Group VoIP signaling
             plEventsToLabels[ElementCallEventType.name] = _td("room_settings|permissions|m.call");
             plEventsToLabels[ElementCallMemberEventType.name] = _td("room_settings|permissions|m.call.member");
         }
diff --git a/src/hooks/room/useElementCallPermissions.tsx b/src/hooks/room/useElementCallPermissions.tsx
index 2dab3049fa..dc0dac2373 100644
--- a/src/hooks/room/useElementCallPermissions.tsx
+++ b/src/hooks/room/useElementCallPermissions.tsx
@@ -16,6 +16,7 @@ import { LocalRoom } from "../../models/LocalRoom";
 import QuestionDialog from "../../components/views/dialogs/QuestionDialog";
 import Modal from "../../Modal";
 import { RoomPowerLevelsEventContent } from "matrix-js-sdk/src/types";
+import { DefaultCallApplicationSlot, RtcSlotEventContent, slotDescriptionToId } from "matrix-js-sdk/src/matrixrtc";
 
 type ElementCallPermissions = {
     canStartCall: boolean;
@@ -75,6 +76,7 @@ function useLegacyCallPermissions(room: Room| LocalRoom): ElementCallPermissions
     };
 }
 
+
 /**
  * Hook for adjusting permissions for enabling Element Call.
  * This requires MSC4354 (Sticky events) to work.
@@ -83,10 +85,11 @@ function useLegacyCallPermissions(room: Room| LocalRoom): ElementCallPermissions
 const useSlotsCallPermissions = (
     room: Room | LocalRoom,
 ): ElementCallPermissions => {
+    const slotId = slotDescriptionToId({id: "", application: "m.call"});
     const [maySendSlot, hasRoomSlot] = useRoomState(room, () => [
-        room.currentState.mayClientSendStateEvent("org.matrix.msc4143.rtc.slot", room.client),
+        room.currentState.mayClientSendStateEvent(EventType.RTCSlot, room.client),
         // TODO: Replace with proper const
-        room.currentState.getStateEvents("org.matrix.msc4143.rtc.slot", "m.call#ROOM")?.getContent()?.application?.type === 'm.call',
+        room.currentState.getStateEvents(EventType.RTCSlot, slotId)?.getContent<RtcSlotEventContent>().application.type === DefaultCallApplicationSlot.application.type,
     ]);
 
     // TODO: Check that we are allowed to create audio/video calls, when the telephony PR lands.
@@ -109,17 +112,14 @@ const useSlotsCallPermissions = (
             return false;
         }
         await room.client.sendStateEvent(room.roomId, "org.matrix.msc4143.rtc.slot", {
-            "application": {
-                "type": "m.call",
-                // m.call.id is not specified here, as we want this slot to be general purpose
-            }
-        }, "m.call#ROOM");
+            "application": DefaultCallApplicationSlot.application
+        }, slotId);
         return true;
     }, [room, hasRoomSlot]);
 
     const removeElementCallSlot = useCallback(async (): Promise<void> => {
         if (hasRoomSlot) {
-            await room.client.sendStateEvent(room.roomId, "org.matrix.msc4143.rtc.slot", { }, "m.call#ROOM");
+            await room.client.sendStateEvent(room.roomId, "org.matrix.msc4143.rtc.slot", { }, slotId);
         }
     }, [room, hasRoomSlot]);
 
@@ -142,6 +142,6 @@ export function useElementCallPermissions (room: Room | LocalRoom): ElementCallP
     // We load both, to avoid conditional hook rendering on settings change.
     const slotsPerms = useSlotsCallPermissions(room);
     const legacyPerms = useLegacyCallPermissions(room);
-    const isMSC4354Enabled = useFeatureEnabled("feature_element_call_msc4354");
+    const isMSC4354Enabled = useFeatureEnabled("feature_element_call_nextgen");
     return isMSC4354Enabled ? slotsPerms : legacyPerms;
 }
\ No newline at end of file
diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index e6acd0129c..c2048f8b17 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -1500,8 +1500,8 @@
         "experimental_description": "Feeling experimental? Try out our latest ideas in development. These features are not finalised; they may be unstable, may change, or may be dropped altogether. <a>Learn more</a>.",
         "experimental_section": "Early previews",
         "extended_profiles_msc_support": "Requires your server to support MSC4133",
-        "feature_element_call_msc4354": "Use sticky events for Element Call",
-        "feature_element_call_msc4354_msc_support": "Requires your server to support MSC4354 (Sticky Events)",
+        "feature_element_call_nextgen": "Enable MultiSFU support for Element Call",
+        "feature_element_call_nextgen_msc_support": "Requires your server to support MSC4354 (Sticky Events)",
         "feature_disable_call_per_sender_encryption": "Disable per-sender encryption for Element Call",
         "feature_wysiwyg_composer_description": "Use rich text instead of Markdown in the message composer.",
         "group_calls": "New group call experience",
@@ -2369,6 +2369,7 @@
             "m.room.tombstone": "Upgrade the room",
             "m.room.topic": "Change topic",
             "m.room.topic_space": "Change description",
+            "m.rtc.slot": "Enable or disable %(brand)s calls",
             "m.space.child": "Manage rooms in this space",
             "m.widget": "Modify widgets",
             "muted_users_section": "Muted Users",
diff --git a/src/models/Call.ts b/src/models/Call.ts
index 9d483e7af7..e66ef55192 100644
--- a/src/models/Call.ts
+++ b/src/models/Call.ts
@@ -709,8 +709,8 @@ export class ElementCall extends Call {
             params.append("allowVoipWithNoMedia", "true");
         }
 
-        if (SettingsStore.getValue("feature_element_call_msc4354")) {
-            params.append("preferStickyEvents", "true");
+        if (SettingsStore.getValue("feature_element_call_nextgen")) {
+            params.append("multiSFU", "true");
         }
 
         // Set custom fonts
diff --git a/src/settings/Settings.tsx b/src/settings/Settings.tsx
index 158c6794ee..c69ba07579 100644
--- a/src/settings/Settings.tsx
+++ b/src/settings/Settings.tsx
@@ -222,7 +222,7 @@ export interface Settings {
     "feature_sliding_sync": IBaseSetting<boolean>;
     "feature_simplified_sliding_sync": IFeature;
     "feature_element_call_video_rooms": IFeature;
-    "feature_element_call_msc4354": IFeature;
+    "feature_element_call_nextgen": IFeature;
     "feature_group_calls": IFeature;
     "feature_disable_call_per_sender_encryption": IFeature;
     "feature_allow_screen_share_only_mode": IFeature;
@@ -630,18 +630,18 @@ export const SETTINGS: Settings = {
         controller: new ReloadOnChangeController(),
         default: false,
     },
-    "feature_element_call_msc4354": {
+    "feature_element_call_nextgen": {
         isFeature: true,
         labsGroup: LabGroup.VoiceAndVideo,
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS_WITH_CONFIG_PRIORITISED,
         supportedLevelsAreOrdered: true,
-        displayName: _td("labs|feature_element_call_msc4354"),
+        displayName: _td("labs|feature_element_call_nextgen"),
         controller: new ServerSupportUnstableFeatureController(
-            "feature_element_call_msc4354",
+            "feature_element_call_nextgen",
             defaultWatchManager,
             [[UNSTABLE_MSC4354_STICKY_EVENTS]],
             undefined,
-            _td("labs|feature_element_call_msc4354_msc_support"),
+            _td("labs|feature_element_call_nextgen_msc_support"),
             false,
         ),
         default: false,
diff --git a/test/unit-tests/Notifier-test.ts b/test/unit-tests/Notifier-test.ts
index 5ff4b0bf77..87c724b114 100644
--- a/test/unit-tests/Notifier-test.ts
+++ b/test/unit-tests/Notifier-test.ts
@@ -433,7 +433,7 @@ describe("Notifier", () => {
         });
 
         it("should not show toast when group call is already connected", () => {
-            const spyCallMemberships = jest.spyOn(MatrixRTCSession, "callMembershipsForRoom").mockReturnValue([
+            const spyCallMemberships = jest.spyOn(MatrixRTCSession, "sessionMembershipsForSlot").mockReturnValue([
                 new CallMembership(
                     mkEvent({
                         event: true,
diff --git a/test/unit-tests/createRoom-test.ts b/test/unit-tests/createRoom-test.ts
index 06fb43cb4c..133b47b985 100644
--- a/test/unit-tests/createRoom-test.ts
+++ b/test/unit-tests/createRoom-test.ts
@@ -125,7 +125,7 @@ describe("createRoom", () => {
     it("sets up Element video rooms correctly", async () => {
         const userId = client.getUserId()!;
         const createCallSpy = jest.spyOn(ElementCall, "create");
-        const callMembershipSpy = jest.spyOn(MatrixRTCSession, "callMembershipsForRoom");
+        const callMembershipSpy = jest.spyOn(MatrixRTCSession, "sessionMembershipsForSlot");
         callMembershipSpy.mockReturnValue([]);
 
         const roomId = await createRoom(client, { roomType: RoomType.UnstableCall });
diff --git a/test/unit-tests/models/Call-test.ts b/test/unit-tests/models/Call-test.ts
index 5d83aa335d..1f441da4b5 100644
--- a/test/unit-tests/models/Call-test.ts
+++ b/test/unit-tests/models/Call-test.ts
@@ -25,6 +25,7 @@ import {
     MatrixRTCSessionManagerEvents,
     MatrixRTCSession,
     MatrixRTCSessionEvent,
+    DefaultCallApplicationSlot,
 } from "matrix-js-sdk/src/matrixrtc";
 
 import type { Mocked } from "jest-mock";
@@ -933,8 +934,8 @@ describe("ElementCall", () => {
             setRoomMembers(["@user:example.com", "@user2:example.com", "@user4:example.com"]);
         });
         it("don't sent notify event if there are existing room call members", async () => {
-            jest.spyOn(MatrixRTCSession, "callMembershipsForRoom").mockReturnValue([
-                { application: "m.call", callId: "" } as unknown as CallMembership,
+            jest.spyOn(MatrixRTCSession, "sessionMembershipsForSlot").mockReturnValue([
+                DefaultCallApplicationSlot as unknown as CallMembership,
             ]);
             const sendEventSpy = jest.spyOn(room.client, "sendEvent");
             ElementCall.create(room);