diff --git a/spec/unit/matrixrtc/MatrixRTCSession.spec.ts b/spec/unit/matrixrtc/MatrixRTCSession.spec.ts
index c1faa5ac0c3..2c40e9a2230 100644
--- a/spec/unit/matrixrtc/MatrixRTCSession.spec.ts
+++ b/spec/unit/matrixrtc/MatrixRTCSession.spec.ts
@@ -74,6 +74,13 @@ describe("MatrixRTCSession", () => {
         expect(sess?.memberships[0].deviceId).toEqual("AAAAAAA");
     });
 
+    it("ignores memberships events of members not in the room", () => {
+        const mockRoom = makeMockRoom([membershipTemplate]);
+        mockRoom.hasMembershipState = (state) => state === "join";
+        sess = MatrixRTCSession.roomSessionForRoom(client, mockRoom);
+        expect(sess?.memberships.length).toEqual(0);
+    });
+
     it("honours created_ts", () => {
         const expiredMembership = Object.assign({}, membershipTemplate);
         expiredMembership.created_ts = 500;
@@ -91,9 +98,12 @@ describe("MatrixRTCSession", () => {
 
     it("safely ignores events with no memberships section", () => {
         const mockRoom = {
+            ...makeMockRoom([]),
             roomId: randomString(8),
             getLiveTimeline: jest.fn().mockReturnValue({
                 getState: jest.fn().mockReturnValue({
+                    on: jest.fn(),
+                    off: jest.fn(),
                     getStateEvents: (_type: string, _stateKey: string) => [
                         {
                             getType: jest.fn().mockReturnValue(EventType.GroupCallMemberPrefix),
@@ -112,9 +122,12 @@ describe("MatrixRTCSession", () => {
 
     it("safely ignores events with junk memberships section", () => {
         const mockRoom = {
+            ...makeMockRoom([]),
             roomId: randomString(8),
             getLiveTimeline: jest.fn().mockReturnValue({
                 getState: jest.fn().mockReturnValue({
+                    on: jest.fn(),
+                    off: jest.fn(),
                     getStateEvents: (_type: string, _stateKey: string) => [
                         {
                             getType: jest.fn().mockReturnValue(EventType.GroupCallMemberPrefix),
diff --git a/spec/unit/matrixrtc/mocks.ts b/spec/unit/matrixrtc/mocks.ts
index e342eb2dc63..84496e657da 100644
--- a/spec/unit/matrixrtc/mocks.ts
+++ b/spec/unit/matrixrtc/mocks.ts
@@ -24,6 +24,7 @@ export function makeMockRoom(memberships: CallMembershipData[], localAge: number
     const roomState = makeMockRoomState(memberships, roomId, localAge);
     return {
         roomId: roomId,
+        hasMembershipState: jest.fn().mockReturnValue(true),
         getLiveTimeline: jest.fn().mockReturnValue({
             getState: jest.fn().mockReturnValue(roomState),
         }),
@@ -33,6 +34,8 @@ export function makeMockRoom(memberships: CallMembershipData[], localAge: number
 export function makeMockRoomState(memberships: CallMembershipData[], roomId: string, localAge: number | null = null) {
     const event = mockRTCEvent(memberships, roomId, localAge);
     return {
+        on: jest.fn(),
+        off: jest.fn(),
         getStateEvents: (_: string, stateKey: string) => {
             if (stateKey !== undefined) return event;
             return [event];
diff --git a/src/matrixrtc/MatrixRTCSession.ts b/src/matrixrtc/MatrixRTCSession.ts
index b8ee6626fd0..99e2c561193 100644
--- a/src/matrixrtc/MatrixRTCSession.ts
+++ b/src/matrixrtc/MatrixRTCSession.ts
@@ -21,6 +21,7 @@ import { Room } from "../models/room";
 import { MatrixClient } from "../client";
 import { EventType } from "../@types/event";
 import { CallMembership, CallMembershipData } from "./CallMembership";
+import { RoomStateEvent } from "../models/room-state";
 import { Focus } from "./focus";
 import { MatrixError, MatrixEvent } from "../matrix";
 import { randomString, secureRandomBase64Url } from "../randomstring";
@@ -152,9 +153,11 @@ export class MatrixRTCSession extends TypedEventEmitter<MatrixRTCSessionEvent, M
                     }
 
                     if (membership.isExpired()) {
-                        logger.info(
-                            `Ignoring expired device membership ${memberEvent.getSender()}/${membership.deviceId}`,
-                        );
+                        logger.info(`Ignoring expired device membership ${membership.sender}/${membership.deviceId}`);
+                        continue;
+                    }
+                    if (!room.hasMembershipState(membership.sender ?? "", "join")) {
+                        logger.info(`Ignoring membership of user ${membership.sender} who is not in the room.`);
                         continue;
                     }
                     callMemberships.push(membership);
@@ -191,6 +194,8 @@ export class MatrixRTCSession extends TypedEventEmitter<MatrixRTCSessionEvent, M
     ) {
         super();
         this._callId = memberships[0]?.callId;
+        const roomState = this.room.getLiveTimeline().getState(EventTimeline.FORWARDS);
+        roomState?.on(RoomStateEvent.Members, this.onMembershipUpdate);
         this.setExpiryTimer();
     }
 
@@ -214,6 +219,8 @@ export class MatrixRTCSession extends TypedEventEmitter<MatrixRTCSessionEvent, M
             clearTimeout(this.memberEventTimeout);
             this.memberEventTimeout = undefined;
         }
+        const roomState = this.room.getLiveTimeline().getState(EventTimeline.FORWARDS);
+        roomState?.off(RoomStateEvent.Members, this.onMembershipUpdate);
     }
 
     /**