diff --git a/src/matrix/calls/group/GroupCall.ts b/src/matrix/calls/group/GroupCall.ts
index 3a28c9a7..886cb53a 100644
--- a/src/matrix/calls/group/GroupCall.ts
+++ b/src/matrix/calls/group/GroupCall.ts
@@ -330,6 +330,7 @@ export class GroupCall extends EventEmitter<{change: never}> {
         if (!deviceInfo) {
             deviceInfo = {
                 ["device_id"]: this.options.ownDeviceId,
+                ["session_id"]: this.options.sessionId,
                 feeds: [{purpose: "m.usermedia"}]
             };
             devicesInfo.push(deviceInfo);
diff --git a/src/matrix/calls/group/Member.ts b/src/matrix/calls/group/Member.ts
index 2929e26c..4086d060 100644
--- a/src/matrix/calls/group/Member.ts
+++ b/src/matrix/calls/group/Member.ts
@@ -138,6 +138,11 @@ export class Member {
     /** @internal */
     handleDeviceMessage(message: SignallingMessage<MGroupCallBase>, deviceId: string, syncLog: ILogItem) {
         syncLog.refDetached(this.logItem);
+        const destSessionId = message.content.dest_session_id;
+        if (destSessionId !== this.options.sessionId) {
+            this.logItem.log({l: "ignoring to_device event with wrong session_id", destSessionId, type: message.type});
+            return;
+        }
         if (message.type === EventType.Invite && !this.peerCall) {
             this.peerCall = this._createPeerCall(message.content.call_id);
         }