diff --git a/grpc_client.go b/grpc_client.go
index 0774ed70..24d2b0cd 100644
--- a/grpc_client.go
+++ b/grpc_client.go
@@ -249,6 +249,36 @@ func (c *GrpcClient) IsSessionInCall(ctx context.Context, sessionId string, room
 	return response.GetInCall(), nil
 }
 
+func (c *GrpcClient) GetInternalSessions(ctx context.Context, roomId string, backend *Backend) (internal map[string]*InternalSessionData, virtual map[string]*VirtualSessionData, err error) {
+	statsGrpcClientCalls.WithLabelValues("GetInternalSessions").Inc()
+	// TODO: Remove debug logging
+	log.Printf("Get internal sessions for %s@%s on %s", roomId, backend.Id(), c.Target())
+	response, err := c.impl.GetInternalSessions(ctx, &GetInternalSessionsRequest{
+		RoomId:     roomId,
+		BackendUrl: backend.Url(),
+	}, grpc.WaitForReady(true))
+	if s, ok := status.FromError(err); ok && s.Code() == codes.NotFound {
+		return nil, nil, nil
+	} else if err != nil {
+		return nil, nil, err
+	}
+
+	if len(response.InternalSessions) > 0 {
+		internal = make(map[string]*InternalSessionData, len(response.InternalSessions))
+		for _, s := range response.InternalSessions {
+			internal[s.SessionId] = s
+		}
+	}
+	if len(response.VirtualSessions) > 0 {
+		virtual = make(map[string]*VirtualSessionData, len(response.VirtualSessions))
+		for _, s := range response.VirtualSessions {
+			virtual[s.SessionId] = s
+		}
+	}
+
+	return
+}
+
 func (c *GrpcClient) GetPublisherId(ctx context.Context, sessionId string, streamType StreamType) (string, string, net.IP, error) {
 	statsGrpcClientCalls.WithLabelValues("GetPublisherId").Inc()
 	// TODO: Remove debug logging
diff --git a/grpc_server.go b/grpc_server.go
index 0ccb1020..44674954 100644
--- a/grpc_server.go
+++ b/grpc_server.go
@@ -59,6 +59,7 @@ type GrpcServerHub interface {
 	GetSessionByResumeId(resumeId string) Session
 	GetSessionByPublicId(sessionId string) Session
 	GetSessionIdByRoomSessionId(roomSessionId string) (string, error)
+	GetRoomForBackend(roomId string, backend *Backend) *Room
 
 	GetBackend(u *url.URL) *Backend
 }
@@ -185,6 +186,52 @@ func (s *GrpcServer) IsSessionInCall(ctx context.Context, request *IsSessionInCa
 	return result, nil
 }
 
+func (s *GrpcServer) GetInternalSessions(ctx context.Context, request *GetInternalSessionsRequest) (*GetInternalSessionsReply, error) {
+	statsGrpcServerCalls.WithLabelValues("GetInternalSessions").Inc()
+	// TODO: Remove debug logging
+	log.Printf("Get internal sessions from %s on %s", request.RoomId, request.BackendUrl)
+
+	var u *url.URL
+	if request.BackendUrl != "" {
+		var err error
+		u, err = url.Parse(request.BackendUrl)
+		if err != nil {
+			return nil, status.Error(codes.InvalidArgument, "invalid url")
+		}
+	}
+
+	backend := s.hub.GetBackend(u)
+	if backend == nil {
+		return nil, status.Error(codes.NotFound, "no such backend")
+	}
+
+	room := s.hub.GetRoomForBackend(request.RoomId, backend)
+	if room == nil {
+		return nil, status.Error(codes.NotFound, "no such room")
+	}
+
+	result := &GetInternalSessionsReply{}
+	room.mu.RLock()
+	defer room.mu.RUnlock()
+
+	for session := range room.internalSessions {
+		result.InternalSessions = append(result.InternalSessions, &InternalSessionData{
+			SessionId: session.PublicId(),
+			InCall:    uint32(session.GetInCall()),
+			Features:  session.GetFeatures(),
+		})
+	}
+
+	for session := range room.virtualSessions {
+		result.VirtualSessions = append(result.VirtualSessions, &VirtualSessionData{
+			SessionId: session.PublicId(),
+			InCall:    uint32(session.GetInCall()),
+		})
+	}
+
+	return result, nil
+}
+
 func (s *GrpcServer) GetPublisherId(ctx context.Context, request *GetPublisherIdRequest) (*GetPublisherIdReply, error) {
 	statsGrpcServerCalls.WithLabelValues("GetPublisherId").Inc()
 	// TODO: Remove debug logging
diff --git a/grpc_sessions.pb.go b/grpc_sessions.pb.go
index 22baa11a..e9fc9b82 100644
--- a/grpc_sessions.pb.go
+++ b/grpc_sessions.pb.go
@@ -333,6 +333,226 @@ func (x *IsSessionInCallReply) GetInCall() bool {
 	return false
 }
 
+type GetInternalSessionsRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	RoomId     string `protobuf:"bytes,1,opt,name=roomId,proto3" json:"roomId,omitempty"`
+	BackendUrl string `protobuf:"bytes,2,opt,name=backendUrl,proto3" json:"backendUrl,omitempty"`
+}
+
+func (x *GetInternalSessionsRequest) Reset() {
+	*x = GetInternalSessionsRequest{}
+	mi := &file_grpc_sessions_proto_msgTypes[6]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *GetInternalSessionsRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetInternalSessionsRequest) ProtoMessage() {}
+
+func (x *GetInternalSessionsRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_grpc_sessions_proto_msgTypes[6]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetInternalSessionsRequest.ProtoReflect.Descriptor instead.
+func (*GetInternalSessionsRequest) Descriptor() ([]byte, []int) {
+	return file_grpc_sessions_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *GetInternalSessionsRequest) GetRoomId() string {
+	if x != nil {
+		return x.RoomId
+	}
+	return ""
+}
+
+func (x *GetInternalSessionsRequest) GetBackendUrl() string {
+	if x != nil {
+		return x.BackendUrl
+	}
+	return ""
+}
+
+type InternalSessionData struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	SessionId string   `protobuf:"bytes,1,opt,name=sessionId,proto3" json:"sessionId,omitempty"`
+	InCall    uint32   `protobuf:"varint,2,opt,name=inCall,proto3" json:"inCall,omitempty"`
+	Features  []string `protobuf:"bytes,3,rep,name=features,proto3" json:"features,omitempty"`
+}
+
+func (x *InternalSessionData) Reset() {
+	*x = InternalSessionData{}
+	mi := &file_grpc_sessions_proto_msgTypes[7]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *InternalSessionData) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*InternalSessionData) ProtoMessage() {}
+
+func (x *InternalSessionData) ProtoReflect() protoreflect.Message {
+	mi := &file_grpc_sessions_proto_msgTypes[7]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use InternalSessionData.ProtoReflect.Descriptor instead.
+func (*InternalSessionData) Descriptor() ([]byte, []int) {
+	return file_grpc_sessions_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *InternalSessionData) GetSessionId() string {
+	if x != nil {
+		return x.SessionId
+	}
+	return ""
+}
+
+func (x *InternalSessionData) GetInCall() uint32 {
+	if x != nil {
+		return x.InCall
+	}
+	return 0
+}
+
+func (x *InternalSessionData) GetFeatures() []string {
+	if x != nil {
+		return x.Features
+	}
+	return nil
+}
+
+type VirtualSessionData struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	SessionId string `protobuf:"bytes,1,opt,name=sessionId,proto3" json:"sessionId,omitempty"`
+	InCall    uint32 `protobuf:"varint,2,opt,name=inCall,proto3" json:"inCall,omitempty"`
+}
+
+func (x *VirtualSessionData) Reset() {
+	*x = VirtualSessionData{}
+	mi := &file_grpc_sessions_proto_msgTypes[8]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *VirtualSessionData) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*VirtualSessionData) ProtoMessage() {}
+
+func (x *VirtualSessionData) ProtoReflect() protoreflect.Message {
+	mi := &file_grpc_sessions_proto_msgTypes[8]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use VirtualSessionData.ProtoReflect.Descriptor instead.
+func (*VirtualSessionData) Descriptor() ([]byte, []int) {
+	return file_grpc_sessions_proto_rawDescGZIP(), []int{8}
+}
+
+func (x *VirtualSessionData) GetSessionId() string {
+	if x != nil {
+		return x.SessionId
+	}
+	return ""
+}
+
+func (x *VirtualSessionData) GetInCall() uint32 {
+	if x != nil {
+		return x.InCall
+	}
+	return 0
+}
+
+type GetInternalSessionsReply struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	InternalSessions []*InternalSessionData `protobuf:"bytes,1,rep,name=internalSessions,proto3" json:"internalSessions,omitempty"`
+	VirtualSessions  []*VirtualSessionData  `protobuf:"bytes,2,rep,name=virtualSessions,proto3" json:"virtualSessions,omitempty"`
+}
+
+func (x *GetInternalSessionsReply) Reset() {
+	*x = GetInternalSessionsReply{}
+	mi := &file_grpc_sessions_proto_msgTypes[9]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *GetInternalSessionsReply) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetInternalSessionsReply) ProtoMessage() {}
+
+func (x *GetInternalSessionsReply) ProtoReflect() protoreflect.Message {
+	mi := &file_grpc_sessions_proto_msgTypes[9]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetInternalSessionsReply.ProtoReflect.Descriptor instead.
+func (*GetInternalSessionsReply) Descriptor() ([]byte, []int) {
+	return file_grpc_sessions_proto_rawDescGZIP(), []int{9}
+}
+
+func (x *GetInternalSessionsReply) GetInternalSessions() []*InternalSessionData {
+	if x != nil {
+		return x.InternalSessions
+	}
+	return nil
+}
+
+func (x *GetInternalSessionsReply) GetVirtualSessions() []*VirtualSessionData {
+	if x != nil {
+		return x.VirtualSessions
+	}
+	return nil
+}
+
 type ClientSessionMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -343,7 +563,7 @@ type ClientSessionMessage struct {
 
 func (x *ClientSessionMessage) Reset() {
 	*x = ClientSessionMessage{}
-	mi := &file_grpc_sessions_proto_msgTypes[6]
+	mi := &file_grpc_sessions_proto_msgTypes[10]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
@@ -355,7 +575,7 @@ func (x *ClientSessionMessage) String() string {
 func (*ClientSessionMessage) ProtoMessage() {}
 
 func (x *ClientSessionMessage) ProtoReflect() protoreflect.Message {
-	mi := &file_grpc_sessions_proto_msgTypes[6]
+	mi := &file_grpc_sessions_proto_msgTypes[10]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -368,7 +588,7 @@ func (x *ClientSessionMessage) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ClientSessionMessage.ProtoReflect.Descriptor instead.
 func (*ClientSessionMessage) Descriptor() ([]byte, []int) {
-	return file_grpc_sessions_proto_rawDescGZIP(), []int{6}
+	return file_grpc_sessions_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *ClientSessionMessage) GetMessage() []byte {
@@ -388,7 +608,7 @@ type ServerSessionMessage struct {
 
 func (x *ServerSessionMessage) Reset() {
 	*x = ServerSessionMessage{}
-	mi := &file_grpc_sessions_proto_msgTypes[7]
+	mi := &file_grpc_sessions_proto_msgTypes[11]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
@@ -400,7 +620,7 @@ func (x *ServerSessionMessage) String() string {
 func (*ServerSessionMessage) ProtoMessage() {}
 
 func (x *ServerSessionMessage) ProtoReflect() protoreflect.Message {
-	mi := &file_grpc_sessions_proto_msgTypes[7]
+	mi := &file_grpc_sessions_proto_msgTypes[11]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -413,7 +633,7 @@ func (x *ServerSessionMessage) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ServerSessionMessage.ProtoReflect.Descriptor instead.
 func (*ServerSessionMessage) Descriptor() ([]byte, []int) {
-	return file_grpc_sessions_proto_rawDescGZIP(), []int{7}
+	return file_grpc_sessions_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *ServerSessionMessage) GetMessage() []byte {
@@ -454,41 +674,75 @@ var file_grpc_sessions_proto_rawDesc = []byte{
 	0x52, 0x0a, 0x62, 0x61, 0x63, 0x6b, 0x65, 0x6e, 0x64, 0x55, 0x72, 0x6c, 0x22, 0x2e, 0x0a, 0x14,
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+	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -503,31 +757,39 @@ func file_grpc_sessions_proto_rawDescGZIP() []byte {
 	return file_grpc_sessions_proto_rawDescData
 }
 
-var file_grpc_sessions_proto_msgTypes = make([]protoimpl.MessageInfo, 8)
+var file_grpc_sessions_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
 var file_grpc_sessions_proto_goTypes = []any{
-	(*LookupResumeIdRequest)(nil),  // 0: signaling.LookupResumeIdRequest
-	(*LookupResumeIdReply)(nil),    // 1: signaling.LookupResumeIdReply
-	(*LookupSessionIdRequest)(nil), // 2: signaling.LookupSessionIdRequest
-	(*LookupSessionIdReply)(nil),   // 3: signaling.LookupSessionIdReply
-	(*IsSessionInCallRequest)(nil), // 4: signaling.IsSessionInCallRequest
-	(*IsSessionInCallReply)(nil),   // 5: signaling.IsSessionInCallReply
-	(*ClientSessionMessage)(nil),   // 6: signaling.ClientSessionMessage
-	(*ServerSessionMessage)(nil),   // 7: signaling.ServerSessionMessage
+	(*LookupResumeIdRequest)(nil),      // 0: signaling.LookupResumeIdRequest
+	(*LookupResumeIdReply)(nil),        // 1: signaling.LookupResumeIdReply
+	(*LookupSessionIdRequest)(nil),     // 2: signaling.LookupSessionIdRequest
+	(*LookupSessionIdReply)(nil),       // 3: signaling.LookupSessionIdReply
+	(*IsSessionInCallRequest)(nil),     // 4: signaling.IsSessionInCallRequest
+	(*IsSessionInCallReply)(nil),       // 5: signaling.IsSessionInCallReply
+	(*GetInternalSessionsRequest)(nil), // 6: signaling.GetInternalSessionsRequest
+	(*InternalSessionData)(nil),        // 7: signaling.InternalSessionData
+	(*VirtualSessionData)(nil),         // 8: signaling.VirtualSessionData
+	(*GetInternalSessionsReply)(nil),   // 9: signaling.GetInternalSessionsReply
+	(*ClientSessionMessage)(nil),       // 10: signaling.ClientSessionMessage
+	(*ServerSessionMessage)(nil),       // 11: signaling.ServerSessionMessage
 }
 var file_grpc_sessions_proto_depIdxs = []int32{
-	0, // 0: signaling.RpcSessions.LookupResumeId:input_type -> signaling.LookupResumeIdRequest
-	2, // 1: signaling.RpcSessions.LookupSessionId:input_type -> signaling.LookupSessionIdRequest
-	4, // 2: signaling.RpcSessions.IsSessionInCall:input_type -> signaling.IsSessionInCallRequest
-	6, // 3: signaling.RpcSessions.ProxySession:input_type -> signaling.ClientSessionMessage
-	1, // 4: signaling.RpcSessions.LookupResumeId:output_type -> signaling.LookupResumeIdReply
-	3, // 5: signaling.RpcSessions.LookupSessionId:output_type -> signaling.LookupSessionIdReply
-	5, // 6: signaling.RpcSessions.IsSessionInCall:output_type -> signaling.IsSessionInCallReply
-	7, // 7: signaling.RpcSessions.ProxySession:output_type -> signaling.ServerSessionMessage
-	4, // [4:8] is the sub-list for method output_type
-	0, // [0:4] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
+	7,  // 0: signaling.GetInternalSessionsReply.internalSessions:type_name -> signaling.InternalSessionData
+	8,  // 1: signaling.GetInternalSessionsReply.virtualSessions:type_name -> signaling.VirtualSessionData
+	0,  // 2: signaling.RpcSessions.LookupResumeId:input_type -> signaling.LookupResumeIdRequest
+	2,  // 3: signaling.RpcSessions.LookupSessionId:input_type -> signaling.LookupSessionIdRequest
+	4,  // 4: signaling.RpcSessions.IsSessionInCall:input_type -> signaling.IsSessionInCallRequest
+	6,  // 5: signaling.RpcSessions.GetInternalSessions:input_type -> signaling.GetInternalSessionsRequest
+	10, // 6: signaling.RpcSessions.ProxySession:input_type -> signaling.ClientSessionMessage
+	1,  // 7: signaling.RpcSessions.LookupResumeId:output_type -> signaling.LookupResumeIdReply
+	3,  // 8: signaling.RpcSessions.LookupSessionId:output_type -> signaling.LookupSessionIdReply
+	5,  // 9: signaling.RpcSessions.IsSessionInCall:output_type -> signaling.IsSessionInCallReply
+	9,  // 10: signaling.RpcSessions.GetInternalSessions:output_type -> signaling.GetInternalSessionsReply
+	11, // 11: signaling.RpcSessions.ProxySession:output_type -> signaling.ServerSessionMessage
+	7,  // [7:12] is the sub-list for method output_type
+	2,  // [2:7] is the sub-list for method input_type
+	2,  // [2:2] is the sub-list for extension type_name
+	2,  // [2:2] is the sub-list for extension extendee
+	0,  // [0:2] is the sub-list for field type_name
 }
 
 func init() { file_grpc_sessions_proto_init() }
@@ -541,7 +803,7 @@ func file_grpc_sessions_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_grpc_sessions_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   8,
+			NumMessages:   12,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/grpc_sessions.proto b/grpc_sessions.proto
index 4dbfab42..3d29dfef 100644
--- a/grpc_sessions.proto
+++ b/grpc_sessions.proto
@@ -29,6 +29,7 @@ service RpcSessions {
   rpc LookupResumeId(LookupResumeIdRequest) returns (LookupResumeIdReply) {}
   rpc LookupSessionId(LookupSessionIdRequest) returns (LookupSessionIdReply) {}
   rpc IsSessionInCall(IsSessionInCallRequest) returns (IsSessionInCallReply) {}
+  rpc GetInternalSessions(GetInternalSessionsRequest) returns (GetInternalSessionsReply) {}
   rpc ProxySession(stream ClientSessionMessage) returns (stream ServerSessionMessage) {}
 }
 
@@ -60,6 +61,27 @@ message IsSessionInCallReply {
   bool inCall = 1;
 }
 
+message GetInternalSessionsRequest {
+  string roomId = 1;
+  string backendUrl = 2;
+}
+
+message InternalSessionData {
+  string sessionId = 1;
+  uint32 inCall = 2;
+  repeated string features = 3;
+}
+
+message VirtualSessionData {
+  string sessionId = 1;
+  uint32 inCall = 2;
+}
+
+message GetInternalSessionsReply {
+  repeated InternalSessionData internalSessions = 1;
+  repeated VirtualSessionData virtualSessions = 2;
+}
+
 message ClientSessionMessage {
   bytes message = 1;
 }
diff --git a/grpc_sessions_grpc.pb.go b/grpc_sessions_grpc.pb.go
index 7898269a..8b9c6a1c 100644
--- a/grpc_sessions_grpc.pb.go
+++ b/grpc_sessions_grpc.pb.go
@@ -37,10 +37,11 @@ import (
 const _ = grpc.SupportPackageIsVersion9
 
 const (
-	RpcSessions_LookupResumeId_FullMethodName  = "/signaling.RpcSessions/LookupResumeId"
-	RpcSessions_LookupSessionId_FullMethodName = "/signaling.RpcSessions/LookupSessionId"
-	RpcSessions_IsSessionInCall_FullMethodName = "/signaling.RpcSessions/IsSessionInCall"
-	RpcSessions_ProxySession_FullMethodName    = "/signaling.RpcSessions/ProxySession"
+	RpcSessions_LookupResumeId_FullMethodName      = "/signaling.RpcSessions/LookupResumeId"
+	RpcSessions_LookupSessionId_FullMethodName     = "/signaling.RpcSessions/LookupSessionId"
+	RpcSessions_IsSessionInCall_FullMethodName     = "/signaling.RpcSessions/IsSessionInCall"
+	RpcSessions_GetInternalSessions_FullMethodName = "/signaling.RpcSessions/GetInternalSessions"
+	RpcSessions_ProxySession_FullMethodName        = "/signaling.RpcSessions/ProxySession"
 )
 
 // RpcSessionsClient is the client API for RpcSessions service.
@@ -50,6 +51,7 @@ type RpcSessionsClient interface {
 	LookupResumeId(ctx context.Context, in *LookupResumeIdRequest, opts ...grpc.CallOption) (*LookupResumeIdReply, error)
 	LookupSessionId(ctx context.Context, in *LookupSessionIdRequest, opts ...grpc.CallOption) (*LookupSessionIdReply, error)
 	IsSessionInCall(ctx context.Context, in *IsSessionInCallRequest, opts ...grpc.CallOption) (*IsSessionInCallReply, error)
+	GetInternalSessions(ctx context.Context, in *GetInternalSessionsRequest, opts ...grpc.CallOption) (*GetInternalSessionsReply, error)
 	ProxySession(ctx context.Context, opts ...grpc.CallOption) (grpc.BidiStreamingClient[ClientSessionMessage, ServerSessionMessage], error)
 }
 
@@ -91,6 +93,16 @@ func (c *rpcSessionsClient) IsSessionInCall(ctx context.Context, in *IsSessionIn
 	return out, nil
 }
 
+func (c *rpcSessionsClient) GetInternalSessions(ctx context.Context, in *GetInternalSessionsRequest, opts ...grpc.CallOption) (*GetInternalSessionsReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(GetInternalSessionsReply)
+	err := c.cc.Invoke(ctx, RpcSessions_GetInternalSessions_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *rpcSessionsClient) ProxySession(ctx context.Context, opts ...grpc.CallOption) (grpc.BidiStreamingClient[ClientSessionMessage, ServerSessionMessage], error) {
 	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
 	stream, err := c.cc.NewStream(ctx, &RpcSessions_ServiceDesc.Streams[0], RpcSessions_ProxySession_FullMethodName, cOpts...)
@@ -111,6 +123,7 @@ type RpcSessionsServer interface {
 	LookupResumeId(context.Context, *LookupResumeIdRequest) (*LookupResumeIdReply, error)
 	LookupSessionId(context.Context, *LookupSessionIdRequest) (*LookupSessionIdReply, error)
 	IsSessionInCall(context.Context, *IsSessionInCallRequest) (*IsSessionInCallReply, error)
+	GetInternalSessions(context.Context, *GetInternalSessionsRequest) (*GetInternalSessionsReply, error)
 	ProxySession(grpc.BidiStreamingServer[ClientSessionMessage, ServerSessionMessage]) error
 	mustEmbedUnimplementedRpcSessionsServer()
 }
@@ -131,6 +144,9 @@ func (UnimplementedRpcSessionsServer) LookupSessionId(context.Context, *LookupSe
 func (UnimplementedRpcSessionsServer) IsSessionInCall(context.Context, *IsSessionInCallRequest) (*IsSessionInCallReply, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method IsSessionInCall not implemented")
 }
+func (UnimplementedRpcSessionsServer) GetInternalSessions(context.Context, *GetInternalSessionsRequest) (*GetInternalSessionsReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetInternalSessions not implemented")
+}
 func (UnimplementedRpcSessionsServer) ProxySession(grpc.BidiStreamingServer[ClientSessionMessage, ServerSessionMessage]) error {
 	return status.Errorf(codes.Unimplemented, "method ProxySession not implemented")
 }
@@ -209,6 +225,24 @@ func _RpcSessions_IsSessionInCall_Handler(srv interface{}, ctx context.Context,
 	return interceptor(ctx, in, info, handler)
 }
 
+func _RpcSessions_GetInternalSessions_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetInternalSessionsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RpcSessionsServer).GetInternalSessions(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: RpcSessions_GetInternalSessions_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RpcSessionsServer).GetInternalSessions(ctx, req.(*GetInternalSessionsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _RpcSessions_ProxySession_Handler(srv interface{}, stream grpc.ServerStream) error {
 	return srv.(RpcSessionsServer).ProxySession(&grpc.GenericServerStream[ClientSessionMessage, ServerSessionMessage]{ServerStream: stream})
 }
@@ -235,6 +269,10 @@ var RpcSessions_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "IsSessionInCall",
 			Handler:    _RpcSessions_IsSessionInCall_Handler,
 		},
+		{
+			MethodName: "GetInternalSessions",
+			Handler:    _RpcSessions_GetInternalSessions_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
diff --git a/hub.go b/hub.go
index 4ebc4164..1720fe61 100644
--- a/hub.go
+++ b/hub.go
@@ -648,6 +648,9 @@ func (h *Hub) GetDialoutSession(roomId string, backend *Backend) *ClientSession
 }
 
 func (h *Hub) GetBackend(u *url.URL) *Backend {
+	if u == nil {
+		return h.backend.GetCompatBackend()
+	}
 	return h.backend.GetBackend(u)
 }
 
@@ -1629,7 +1632,7 @@ func (h *Hub) processRoom(sess Session, message *ClientMessage) {
 		return
 	}
 
-	if room := h.getRoomForBackend(roomId, session.Backend()); room != nil && room.HasSession(session) {
+	if room := h.GetRoomForBackend(roomId, session.Backend()); room != nil && room.HasSession(session) {
 		// Session already is in that room, no action needed.
 		roomSessionId := message.Room.SessionId
 		if roomSessionId == "" {
@@ -1770,7 +1773,7 @@ func (h *Hub) publishFederatedSessions() (int, *sync.WaitGroup) {
 	return count, &wg
 }
 
-func (h *Hub) getRoomForBackend(id string, backend *Backend) *Room {
+func (h *Hub) GetRoomForBackend(id string, backend *Backend) *Room {
 	internalRoomId := getRoomIdForBackend(id, backend)
 
 	h.ru.RLock()
@@ -2256,7 +2259,7 @@ func (h *Hub) processInternalMsg(sess Session, message *ClientMessage) {
 	switch msg.Type {
 	case "addsession":
 		msg := msg.AddSession
-		room := h.getRoomForBackend(msg.RoomId, session.Backend())
+		room := h.GetRoomForBackend(msg.RoomId, session.Backend())
 		if room == nil {
 			log.Printf("Ignore add session message %+v for invalid room %s from %s", *msg, msg.RoomId, session.PublicId())
 			return
@@ -2333,7 +2336,7 @@ func (h *Hub) processInternalMsg(sess Session, message *ClientMessage) {
 		room.AddSession(sess, nil)
 	case "updatesession":
 		msg := msg.UpdateSession
-		room := h.getRoomForBackend(msg.RoomId, session.Backend())
+		room := h.GetRoomForBackend(msg.RoomId, session.Backend())
 		if room == nil {
 			log.Printf("Ignore remove session message %+v for invalid room %s from %s", *msg, msg.RoomId, session.PublicId())
 			return
@@ -2371,7 +2374,7 @@ func (h *Hub) processInternalMsg(sess Session, message *ClientMessage) {
 		}
 	case "removesession":
 		msg := msg.RemoveSession
-		room := h.getRoomForBackend(msg.RoomId, session.Backend())
+		room := h.GetRoomForBackend(msg.RoomId, session.Backend())
 		if room == nil {
 			log.Printf("Ignore remove session message %+v for invalid room %s from %s", *msg, msg.RoomId, session.PublicId())
 			return
diff --git a/hub_test.go b/hub_test.go
index 69454e5b..6f835cf2 100644
--- a/hub_test.go
+++ b/hub_test.go
@@ -4488,6 +4488,7 @@ func TestVirtualClientSessions(t *testing.T) {
 			}
 
 			virtualSession := virtualSessions[0]
+
 			if msg, err := client1.RunUntilMessage(ctx); assert.NoError(err) {
 				assert.NoError(client1.checkMessageJoinedSession(msg, virtualSession.PublicId(), virtualUserId))
 			}
@@ -4625,6 +4626,290 @@ func TestVirtualClientSessions(t *testing.T) {
 	}
 }
 
+func TestDuplicateVirtualSessions(t *testing.T) {
+	CatchLogForTest(t)
+	for _, subtest := range clusteredTests {
+		t.Run(subtest, func(t *testing.T) {
+			t.Parallel()
+			require := require.New(t)
+			assert := assert.New(t)
+			var hub1 *Hub
+			var hub2 *Hub
+			var server1 *httptest.Server
+			var server2 *httptest.Server
+			if isLocalTest(t) {
+				hub1, _, _, server1 = CreateHubForTest(t)
+
+				hub2 = hub1
+				server2 = server1
+			} else {
+				hub1, hub2, server1, server2 = CreateClusteredHubsForTest(t)
+			}
+
+			ctx, cancel := context.WithTimeout(context.Background(), testTimeout)
+			defer cancel()
+
+			client1 := NewTestClient(t, server1, hub1)
+			defer client1.CloseWithBye()
+
+			require.NoError(client1.SendHello(testDefaultUserId))
+
+			hello1, err := client1.RunUntilHello(ctx)
+			require.NoError(err)
+
+			roomId := "test-room"
+			_, err = client1.JoinRoom(ctx, roomId)
+			require.NoError(err)
+
+			assert.NoError(client1.RunUntilJoined(ctx, hello1.Hello))
+
+			client2 := NewTestClient(t, server2, hub2)
+			defer client2.CloseWithBye()
+
+			require.NoError(client2.SendHelloInternal())
+
+			hello2, err := client2.RunUntilHello(ctx)
+			require.NoError(err)
+			session2 := hub2.GetSessionByPublicId(hello2.Hello.SessionId).(*ClientSession)
+			require.NotNil(session2, "Session %s does not exist", hello2.Hello.SessionId)
+
+			_, err = client2.JoinRoom(ctx, roomId)
+			require.NoError(err)
+
+			assert.NoError(client1.RunUntilJoined(ctx, hello2.Hello))
+
+			if msg, err := client1.RunUntilMessage(ctx); assert.NoError(err) {
+				if msg, err := checkMessageParticipantsInCall(msg); assert.NoError(err) {
+					if assert.Len(msg.Users, 1) {
+						assert.Equal(true, msg.Users[0]["internal"], "%+v", msg)
+						assert.Equal(hello2.Hello.SessionId, msg.Users[0]["sessionId"], "%+v", msg)
+						assert.EqualValues(3, msg.Users[0]["inCall"], "%+v", msg)
+					}
+				}
+			}
+
+			_, unexpected, err := client2.RunUntilJoinedAndReturn(ctx, hello1.Hello, hello2.Hello)
+			assert.NoError(err)
+
+			if len(unexpected) == 0 {
+				if msg, err := client2.RunUntilMessage(ctx); assert.NoError(err) {
+					unexpected = append(unexpected, msg)
+				}
+			}
+
+			require.Len(unexpected, 1)
+			if msg, err := checkMessageParticipantsInCall(unexpected[0]); assert.NoError(err) {
+				if assert.Len(msg.Users, 1) {
+					assert.Equal(true, msg.Users[0]["internal"])
+					assert.Equal(hello2.Hello.SessionId, msg.Users[0]["sessionId"])
+					assert.EqualValues(FlagInCall|FlagWithAudio, msg.Users[0]["inCall"])
+				}
+			}
+
+			calledCtx, calledCancel := context.WithTimeout(ctx, time.Second)
+
+			virtualSessionId := "virtual-session-id"
+			virtualUserId := "virtual-user-id"
+			generatedSessionId := GetVirtualSessionId(session2, virtualSessionId)
+
+			setSessionRequestHandler(t, func(request *BackendClientSessionRequest) {
+				defer calledCancel()
+				assert.Equal("add", request.Action, "%+v", request)
+				assert.Equal(roomId, request.RoomId, "%+v", request)
+				assert.NotEqual(generatedSessionId, request.SessionId, "%+v", request)
+				assert.Equal(virtualUserId, request.UserId, "%+v", request)
+			})
+
+			require.NoError(client2.SendInternalAddSession(&AddSessionInternalClientMessage{
+				CommonSessionInternalClientMessage: CommonSessionInternalClientMessage{
+					SessionId: virtualSessionId,
+					RoomId:    roomId,
+				},
+				UserId: virtualUserId,
+				Flags:  FLAG_MUTED_SPEAKING,
+			}))
+			<-calledCtx.Done()
+			if err := calledCtx.Err(); err != nil {
+				require.ErrorIs(err, context.Canceled)
+			}
+
+			virtualSessions := session2.GetVirtualSessions()
+			for len(virtualSessions) == 0 {
+				time.Sleep(time.Millisecond)
+				virtualSessions = session2.GetVirtualSessions()
+			}
+
+			virtualSession := virtualSessions[0]
+			if msg, err := client1.RunUntilMessage(ctx); assert.NoError(err) {
+				assert.NoError(client1.checkMessageJoinedSession(msg, virtualSession.PublicId(), virtualUserId))
+			}
+
+			if msg, err := client1.RunUntilMessage(ctx); assert.NoError(err) {
+				if msg, err := checkMessageParticipantsInCall(msg); assert.NoError(err) {
+					if assert.Len(msg.Users, 2) {
+						assert.Equal(true, msg.Users[0]["internal"], "%+v", msg)
+						assert.Equal(hello2.Hello.SessionId, msg.Users[0]["sessionId"], "%+v", msg)
+						assert.EqualValues(FlagInCall|FlagWithAudio, msg.Users[0]["inCall"], "%+v", msg)
+
+						assert.Equal(true, msg.Users[1]["virtual"], "%+v", msg)
+						assert.Equal(virtualSession.PublicId(), msg.Users[1]["sessionId"], "%+v", msg)
+						assert.EqualValues(FlagInCall|FlagWithPhone, msg.Users[1]["inCall"], "%+v", msg)
+					}
+				}
+			}
+
+			if msg, err := client1.RunUntilMessage(ctx); assert.NoError(err) {
+				if flags, err := checkMessageParticipantFlags(msg); assert.NoError(err) {
+					assert.Equal(roomId, flags.RoomId)
+					assert.Equal(virtualSession.PublicId(), flags.SessionId)
+					assert.EqualValues(FLAG_MUTED_SPEAKING, flags.Flags)
+				}
+			}
+
+			if msg, err := client2.RunUntilMessage(ctx); assert.NoError(err) {
+				assert.NoError(client2.checkMessageJoinedSession(msg, virtualSession.PublicId(), virtualUserId))
+			}
+
+			if msg, err := client2.RunUntilMessage(ctx); assert.NoError(err) {
+				if msg, err := checkMessageParticipantsInCall(msg); assert.NoError(err) {
+					if assert.Len(msg.Users, 2) {
+						assert.Equal(true, msg.Users[0]["internal"], "%+v", msg)
+						assert.Equal(hello2.Hello.SessionId, msg.Users[0]["sessionId"], "%+v", msg)
+						assert.EqualValues(FlagInCall|FlagWithAudio, msg.Users[0]["inCall"], "%+v", msg)
+
+						assert.Equal(true, msg.Users[1]["virtual"], "%+v", msg)
+						assert.Equal(virtualSession.PublicId(), msg.Users[1]["sessionId"], "%+v", msg)
+						assert.EqualValues(FlagInCall|FlagWithPhone, msg.Users[1]["inCall"], "%+v", msg)
+					}
+				}
+			}
+
+			if msg, err := client2.RunUntilMessage(ctx); assert.NoError(err) {
+				if flags, err := checkMessageParticipantFlags(msg); assert.NoError(err) {
+					assert.Equal(roomId, flags.RoomId)
+					assert.Equal(virtualSession.PublicId(), flags.SessionId)
+					assert.EqualValues(FLAG_MUTED_SPEAKING, flags.Flags)
+				}
+			}
+
+			msg := &BackendServerRoomRequest{
+				Type: "incall",
+				InCall: &BackendRoomInCallRequest{
+					InCall: []byte("0"),
+					Users: []map[string]interface{}{
+						{
+							"sessionId":              virtualSession.PublicId(),
+							"participantPermissions": 246,
+							"participantType":        4,
+							"lastPing":               123456789,
+						},
+						{
+							// Request is coming from Nextcloud, so use its session id (which is our "room session id").
+							"sessionId":              roomId + "-" + hello1.Hello.SessionId,
+							"participantPermissions": 254,
+							"participantType":        1,
+							"lastPing":               234567890,
+						},
+					},
+				},
+			}
+
+			data, err := json.Marshal(msg)
+			require.NoError(err)
+			res, err := performBackendRequest(server2.URL+"/api/v1/room/"+roomId, data)
+			require.NoError(err)
+			defer res.Body.Close()
+			body, err := io.ReadAll(res.Body)
+			assert.NoError(err)
+			assert.Equal(http.StatusOK, res.StatusCode, "Expected successful request, got %s", string(body))
+
+			if msg, err := client1.RunUntilMessage(ctx); assert.NoError(err) {
+				if msg, err := checkMessageParticipantsInCall(msg); assert.NoError(err) {
+					if assert.Len(msg.Users, 3) {
+						assert.Equal(true, msg.Users[0]["virtual"], "%+v", msg)
+						assert.Equal(virtualSession.PublicId(), msg.Users[0]["sessionId"], "%+v", msg)
+						assert.EqualValues(FlagInCall|FlagWithPhone, msg.Users[0]["inCall"], "%+v", msg)
+						assert.EqualValues(246, msg.Users[0]["participantPermissions"], "%+v", msg)
+						assert.EqualValues(4, msg.Users[0]["participantType"], "%+v", msg)
+
+						assert.Equal(hello1.Hello.SessionId, msg.Users[1]["sessionId"], "%+v", msg)
+						assert.Nil(msg.Users[1]["inCall"], "%+v", msg)
+						assert.EqualValues(254, msg.Users[1]["participantPermissions"], "%+v", msg)
+						assert.EqualValues(1, msg.Users[1]["participantType"], "%+v", msg)
+
+						assert.Equal(true, msg.Users[2]["internal"], "%+v", msg)
+						assert.Equal(hello2.Hello.SessionId, msg.Users[2]["sessionId"], "%+v", msg)
+						assert.EqualValues(FlagInCall|FlagWithAudio, msg.Users[2]["inCall"], "%+v", msg)
+					}
+				}
+			}
+
+			if msg, err := client2.RunUntilMessage(ctx); assert.NoError(err) {
+				if msg, err := checkMessageParticipantsInCall(msg); assert.NoError(err) {
+					if assert.Len(msg.Users, 3) {
+						assert.Equal(true, msg.Users[0]["virtual"], "%+v", msg)
+						assert.Equal(virtualSession.PublicId(), msg.Users[0]["sessionId"], "%+v", msg)
+						assert.EqualValues(FlagInCall|FlagWithPhone, msg.Users[0]["inCall"], "%+v", msg)
+						assert.EqualValues(246, msg.Users[0]["participantPermissions"], "%+v", msg)
+						assert.EqualValues(4, msg.Users[0]["participantType"], "%+v", msg)
+
+						assert.Equal(hello1.Hello.SessionId, msg.Users[1]["sessionId"], "%+v", msg)
+						assert.Nil(msg.Users[1]["inCall"], "%+v", msg)
+						assert.EqualValues(254, msg.Users[1]["participantPermissions"], "%+v", msg)
+						assert.EqualValues(1, msg.Users[1]["participantType"], "%+v", msg)
+
+						assert.Equal(true, msg.Users[2]["internal"], "%+v", msg)
+						assert.Equal(hello2.Hello.SessionId, msg.Users[2]["sessionId"], "%+v", msg)
+						assert.EqualValues(FlagInCall|FlagWithAudio, msg.Users[2]["inCall"], "%+v", msg)
+					}
+				}
+			}
+
+			client1.Close()
+			assert.NoError(client1.WaitForClientRemoved(ctx))
+
+			client3 := NewTestClient(t, server1, hub1)
+			defer client3.CloseWithBye()
+
+			require.NoError(client3.SendHelloResume(hello1.Hello.ResumeId))
+			if hello3, err := client3.RunUntilHello(ctx); assert.NoError(err) {
+				assert.Equal(testDefaultUserId, hello3.Hello.UserId, "%+v", hello3.Hello)
+				assert.Equal(hello1.Hello.SessionId, hello3.Hello.SessionId, "%+v", hello3.Hello)
+				assert.Equal(hello1.Hello.ResumeId, hello3.Hello.ResumeId, "%+v", hello3.Hello)
+			}
+
+			if msg, err := client3.RunUntilMessage(ctx); assert.NoError(err) {
+				if msg, err := checkMessageParticipantsInCall(msg); assert.NoError(err) {
+					if assert.Len(msg.Users, 3) {
+						assert.Equal(true, msg.Users[0]["virtual"], "%+v", msg)
+						assert.Equal(virtualSession.PublicId(), msg.Users[0]["sessionId"], "%+v", msg)
+						assert.EqualValues(FlagInCall|FlagWithPhone, msg.Users[0]["inCall"], "%+v", msg)
+						assert.EqualValues(246, msg.Users[0]["participantPermissions"], "%+v", msg)
+						assert.EqualValues(4, msg.Users[0]["participantType"], "%+v", msg)
+
+						assert.Equal(hello1.Hello.SessionId, msg.Users[1]["sessionId"], "%+v", msg)
+						assert.Nil(msg.Users[1]["inCall"], "%+v", msg)
+						assert.EqualValues(254, msg.Users[1]["participantPermissions"], "%+v", msg)
+						assert.EqualValues(1, msg.Users[1]["participantType"], "%+v", msg)
+
+						assert.Equal(true, msg.Users[2]["internal"], "%+v", msg)
+						assert.Equal(hello2.Hello.SessionId, msg.Users[2]["sessionId"], "%+v", msg)
+						assert.EqualValues(FlagInCall|FlagWithAudio, msg.Users[2]["inCall"], "%+v", msg)
+					}
+				}
+			}
+
+			setSessionRequestHandler(t, func(request *BackendClientSessionRequest) {
+				defer calledCancel()
+				assert.Equal("remove", request.Action, "%+v", request)
+				assert.Equal(roomId, request.RoomId, "%+v", request)
+				assert.NotEqual(generatedSessionId, request.SessionId, "%+v", request)
+				assert.Equal(virtualUserId, request.UserId, "%+v", request)
+			})
+		})
+	}
+}
+
 func DoTestSwitchToOne(t *testing.T, details map[string]interface{}) {
 	CatchLogForTest(t)
 	for _, subtest := range clusteredTests {
diff --git a/mcu_proxy_test.go b/mcu_proxy_test.go
index cfdb865f..f16ccfb3 100644
--- a/mcu_proxy_test.go
+++ b/mcu_proxy_test.go
@@ -1346,6 +1346,10 @@ func (h *mockGrpcServerHub) GetBackend(u *url.URL) *Backend {
 	return nil
 }
 
+func (h *mockGrpcServerHub) GetRoomForBackend(roomId string, backend *Backend) *Room {
+	return nil
+}
+
 func Test_ProxyRemotePublisher(t *testing.T) {
 	CatchLogForTest(t)
 	t.Parallel()
diff --git a/room.go b/room.go
index 19a9ff50..82ea8a0a 100644
--- a/room.go
+++ b/room.go
@@ -71,7 +71,7 @@ type Room struct {
 	mu       *sync.RWMutex
 	sessions map[string]Session
 
-	internalSessions map[Session]bool
+	internalSessions map[*ClientSession]bool
 	virtualSessions  map[*VirtualSession]bool
 	inCallSessions   map[Session]bool
 	roomSessionData  map[string]*RoomSessionData
@@ -108,7 +108,7 @@ func NewRoom(roomId string, properties json.RawMessage, hub *Hub, events AsyncEv
 		mu:       &sync.RWMutex{},
 		sessions: make(map[string]Session),
 
-		internalSessions: make(map[Session]bool),
+		internalSessions: make(map[*ClientSession]bool),
 		virtualSessions:  make(map[*VirtualSession]bool),
 		inCallSessions:   make(map[Session]bool),
 		roomSessionData:  make(map[string]*RoomSessionData),
@@ -290,13 +290,19 @@ func (r *Room) AddSession(session Session, sessionData json.RawMessage) {
 	var publishUsersChanged bool
 	switch session.ClientType() {
 	case HelloClientTypeInternal:
-		r.internalSessions[session] = true
+		clientSession, ok := session.(*ClientSession)
+		if !ok {
+			delete(r.sessions, sid)
+			r.mu.Unlock()
+			panic(fmt.Sprintf("Expected a client session, got %v (%T)", session, session))
+		}
+		r.internalSessions[clientSession] = true
 	case HelloClientTypeVirtual:
 		virtualSession, ok := session.(*VirtualSession)
 		if !ok {
 			delete(r.sessions, sid)
 			r.mu.Unlock()
-			panic(fmt.Sprintf("Expected a virtual session, got %v", session))
+			panic(fmt.Sprintf("Expected a virtual session, got %v (%T)", session, session))
 		}
 		r.virtualSessions[virtualSession] = true
 		publishUsersChanged = true
@@ -447,11 +453,21 @@ func (r *Room) RemoveSession(session Session) bool {
 	sid := session.PublicId()
 	r.statsRoomSessionsCurrent.With(prometheus.Labels{"clienttype": session.ClientType()}).Dec()
 	delete(r.sessions, sid)
-	delete(r.internalSessions, session)
 	if virtualSession, ok := session.(*VirtualSession); ok {
 		delete(r.virtualSessions, virtualSession)
+		// Handle case where virtual session was also sent by Nextcloud.
+		users := make([]map[string]interface{}, 0, len(r.users))
+		for _, u := range r.users {
+			if u["sessionId"] != sid {
+				users = append(users, u)
+			}
+		}
+		if len(users) != len(r.users) {
+			r.users = users
+		}
 	}
 	if clientSession, ok := session.(*ClientSession); ok {
+		delete(r.internalSessions, clientSession)
 		r.transientData.RemoveListener(clientSession)
 	}
 	delete(r.inCallSessions, session)
@@ -568,10 +584,66 @@ func (r *Room) PublishSessionLeft(session Session) {
 	}
 }
 
+func (r *Room) getClusteredInternalSessionsRLocked() (internal map[string]*InternalSessionData, virtual map[string]*VirtualSessionData) {
+	if r.hub.rpcClients == nil {
+		return nil, nil
+	}
+
+	r.mu.RUnlock()
+	defer r.mu.RLock()
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+
+	var mu sync.Mutex
+	var wg sync.WaitGroup
+	for _, client := range r.hub.rpcClients.GetClients() {
+		wg.Add(1)
+		go func(c *GrpcClient) {
+			defer wg.Done()
+
+			clientInternal, clientVirtual, err := c.GetInternalSessions(ctx, r.Id(), r.Backend())
+			if err != nil {
+				log.Printf("Received error while getting internal sessions for %s@%s from %s: %s", r.Id(), r.Backend().Id(), c.Target(), err)
+				return
+			}
+
+			mu.Lock()
+			defer mu.Unlock()
+			if internal == nil {
+				internal = make(map[string]*InternalSessionData, len(clientInternal))
+			}
+			for sid, s := range clientInternal {
+				internal[sid] = s
+			}
+			if virtual == nil {
+				virtual = make(map[string]*VirtualSessionData, len(clientVirtual))
+			}
+			for sid, s := range clientVirtual {
+				virtual[sid] = s
+			}
+		}(client)
+	}
+	wg.Wait()
+
+	return
+}
+
 func (r *Room) addInternalSessions(users []map[string]interface{}) []map[string]interface{} {
 	now := time.Now().Unix()
-	r.mu.Lock()
-	defer r.mu.Unlock()
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	if len(users) == 0 && len(r.internalSessions) == 0 && len(r.virtualSessions) == 0 {
+		return users
+	}
+
+	clusteredInternalSessions, clusteredVirtualSessions := r.getClusteredInternalSessionsRLocked()
+
+	// Local sessions might have changed while waiting for clustered information.
+	if len(users) == 0 && len(r.internalSessions) == 0 && len(r.virtualSessions) == 0 {
+		return users
+	}
+
+	skipSession := make(map[string]bool)
 	for _, user := range users {
 		sessionid, found := user["sessionId"]
 		if !found || sessionid == "" {
@@ -581,21 +653,69 @@ func (r *Room) addInternalSessions(users []map[string]interface{}) []map[string]
 		if userid, found := user["userId"]; !found || userid == "" {
 			if roomSessionData, found := r.roomSessionData[sessionid.(string)]; found {
 				user["userId"] = roomSessionData.UserId
+			} else if sid, ok := sessionid.(string); ok {
+				if entry, found := clusteredVirtualSessions[sid]; found {
+					user["virtual"] = true
+					user["inCall"] = entry.GetInCall()
+					skipSession[sid] = true
+				} else {
+					for session := range r.virtualSessions {
+						if session.PublicId() == sid {
+							user["virtual"] = true
+							user["inCall"] = session.GetInCall()
+							skipSession[sid] = true
+							break
+						}
+					}
+				}
 			}
 		}
 	}
 	for session := range r.internalSessions {
-		users = append(users, map[string]interface{}{
-			"inCall":    session.(*ClientSession).GetInCall(),
+		u := map[string]interface{}{
+			"inCall":    session.GetInCall(),
 			"sessionId": session.PublicId(),
 			"lastPing":  now,
 			"internal":  true,
-		})
+		}
+		if f := session.GetFeatures(); len(f) > 0 {
+			u["features"] = f
+		}
+		users = append(users, u)
+	}
+	for _, session := range clusteredInternalSessions {
+		u := map[string]interface{}{
+			"inCall":    session.GetInCall(),
+			"sessionId": session.GetSessionId(),
+			"lastPing":  now,
+			"internal":  true,
+		}
+		if f := session.GetFeatures(); len(f) > 0 {
+			u["features"] = f
+		}
+		users = append(users, u)
 	}
 	for session := range r.virtualSessions {
+		sid := session.PublicId()
+		if skipSession[sid] {
+			continue
+		}
+		skipSession[sid] = true
 		users = append(users, map[string]interface{}{
 			"inCall":    session.GetInCall(),
-			"sessionId": session.PublicId(),
+			"sessionId": sid,
+			"lastPing":  now,
+			"virtual":   true,
+		})
+	}
+	for sid, session := range clusteredVirtualSessions {
+		if skipSession[sid] {
+			continue
+		}
+
+		users = append(users, map[string]interface{}{
+			"inCall":    session.GetInCall(),
+			"sessionId": sid,
 			"lastPing":  now,
 			"virtual":   true,
 		})
@@ -974,7 +1094,7 @@ func (r *Room) publishActiveSessions() (int, *sync.WaitGroup) {
 }
 
 func (r *Room) publishRoomMessage(message *BackendRoomMessageRequest) {
-	if message == nil || message.Data == nil {
+	if message == nil || len(message.Data) == 0 {
 		return
 	}
 
@@ -1062,10 +1182,10 @@ func (r *Room) notifyInternalRoomDeleted() {
 		},
 	}
 
-	r.mu.Lock()
-	defer r.mu.Unlock()
+	r.mu.RLock()
+	defer r.mu.RUnlock()
 	for s := range r.internalSessions {
-		s.(*ClientSession).SendMessage(msg)
+		s.SendMessage(msg)
 	}
 }