diff --git a/go.mod b/go.mod
index de0d291..2dc1528 100644
--- a/go.mod
+++ b/go.mod
@@ -26,7 +26,7 @@ require (
 	go.uber.org/zap v1.27.0
 	google.golang.org/grpc v1.71.0
 	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.5.1
-	google.golang.org/protobuf v1.36.5
+	google.golang.org/protobuf v1.36.6
 )
 
 require (
diff --git a/go.sum b/go.sum
index e350a99..f790684 100644
--- a/go.sum
+++ b/go.sum
@@ -308,8 +308,8 @@ google.golang.org/grpc v1.71.0 h1:kF77BGdPTQ4/JZWMlb9VpJ5pa25aqvVqogsxNHHdeBg=
 google.golang.org/grpc v1.71.0/go.mod h1:H0GRtasmQOh9LkFoCPDu3ZrwUtD1YGE+b2vYBYd/8Ec=
 google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.5.1 h1:F29+wU6Ee6qgu9TddPgooOdaqsxTMunOoj8KA5yuS5A=
 google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.5.1/go.mod h1:5KF+wpkbTSbGcR9zteSqZV6fqFOWBl4Yde8En8MryZA=
-google.golang.org/protobuf v1.36.5 h1:tPhr+woSbjfYvY6/GPufUoYizxw1cF/yFoxJ2fmpwlM=
-google.golang.org/protobuf v1.36.5/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
+google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
diff --git a/grpc_backend.pb.go b/grpc_backend.pb.go
index 099aa84..35d30d2 100644
--- a/grpc_backend.pb.go
+++ b/grpc_backend.pb.go
@@ -129,27 +129,16 @@ func (x *GetSessionCountReply) GetCount() uint32 {
 
 var File_grpc_backend_proto protoreflect.FileDescriptor
 
-var file_grpc_backend_proto_rawDesc = string([]byte{
-	0x0a, 0x12, 0x67, 0x72, 0x70, 0x63, 0x5f, 0x62, 0x61, 0x63, 0x6b, 0x65, 0x6e, 0x64, 0x2e, 0x70,
-	0x72, 0x6f, 0x74, 0x6f, 0x12, 0x09, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x22,
-	0x2a, 0x0a, 0x16, 0x47, 0x65, 0x74, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x43, 0x6f, 0x75,
-	0x6e, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x10, 0x0a, 0x03, 0x75, 0x72, 0x6c,
-	0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x75, 0x72, 0x6c, 0x22, 0x2c, 0x0a, 0x14, 0x47,
-	0x65, 0x74, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x52, 0x65,
-	0x70, 0x6c, 0x79, 0x12, 0x14, 0x0a, 0x05, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x18, 0x01, 0x20, 0x01,
-	0x28, 0x0d, 0x52, 0x05, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x32, 0x65, 0x0a, 0x0a, 0x52, 0x70, 0x63,
-	0x42, 0x61, 0x63, 0x6b, 0x65, 0x6e, 0x64, 0x12, 0x57, 0x0a, 0x0f, 0x47, 0x65, 0x74, 0x53, 0x65,
-	0x73, 0x73, 0x69, 0x6f, 0x6e, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x21, 0x2e, 0x73, 0x69, 0x67,
-	0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x2e, 0x47, 0x65, 0x74, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f,
-	0x6e, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1f, 0x2e,
-	0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x2e, 0x47, 0x65, 0x74, 0x53, 0x65, 0x73,
-	0x73, 0x69, 0x6f, 0x6e, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x52, 0x65, 0x70, 0x6c, 0x79, 0x22, 0x00,
-	0x42, 0x3c, 0x5a, 0x3a, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x73,
-	0x74, 0x72, 0x75, 0x6b, 0x74, 0x75, 0x72, 0x61, 0x67, 0x2f, 0x6e, 0x65, 0x78, 0x74, 0x63, 0x6c,
-	0x6f, 0x75, 0x64, 0x2d, 0x73, 0x70, 0x72, 0x65, 0x65, 0x64, 0x2d, 0x73, 0x69, 0x67, 0x6e, 0x61,
-	0x6c, 0x69, 0x6e, 0x67, 0x3b, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x62, 0x06,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-})
+const file_grpc_backend_proto_rawDesc = "" +
+	"\n" +
+	"\x12grpc_backend.proto\x12\tsignaling\"*\n" +
+	"\x16GetSessionCountRequest\x12\x10\n" +
+	"\x03url\x18\x01 \x01(\tR\x03url\",\n" +
+	"\x14GetSessionCountReply\x12\x14\n" +
+	"\x05count\x18\x01 \x01(\rR\x05count2e\n" +
+	"\n" +
+	"RpcBackend\x12W\n" +
+	"\x0fGetSessionCount\x12!.signaling.GetSessionCountRequest\x1a\x1f.signaling.GetSessionCountReply\"\x00B<Z:github.com/strukturag/nextcloud-spreed-signaling;signalingb\x06proto3"
 
 var (
 	file_grpc_backend_proto_rawDescOnce sync.Once
diff --git a/grpc_internal.pb.go b/grpc_internal.pb.go
index 75636e4..470c6a0 100644
--- a/grpc_internal.pb.go
+++ b/grpc_internal.pb.go
@@ -129,27 +129,15 @@ func (x *GetServerIdReply) GetVersion() string {
 
 var File_grpc_internal_proto protoreflect.FileDescriptor
 
-var file_grpc_internal_proto_rawDesc = string([]byte{
-	0x0a, 0x13, 0x67, 0x72, 0x70, 0x63, 0x5f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2e,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x09, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67,
-	0x22, 0x14, 0x0a, 0x12, 0x47, 0x65, 0x74, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x49, 0x64, 0x52,
-	0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x22, 0x48, 0x0a, 0x10, 0x47, 0x65, 0x74, 0x53, 0x65, 0x72,
-	0x76, 0x65, 0x72, 0x49, 0x64, 0x52, 0x65, 0x70, 0x6c, 0x79, 0x12, 0x1a, 0x0a, 0x08, 0x73, 0x65,
-	0x72, 0x76, 0x65, 0x72, 0x49, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x73, 0x65,
-	0x72, 0x76, 0x65, 0x72, 0x49, 0x64, 0x12, 0x18, 0x0a, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f,
-	0x6e, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e,
-	0x32, 0x5a, 0x0a, 0x0b, 0x52, 0x70, 0x63, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x12,
-	0x4b, 0x0a, 0x0b, 0x47, 0x65, 0x74, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x49, 0x64, 0x12, 0x1d,
-	0x2e, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x2e, 0x47, 0x65, 0x74, 0x53, 0x65,
-	0x72, 0x76, 0x65, 0x72, 0x49, 0x64, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1b, 0x2e,
-	0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x2e, 0x47, 0x65, 0x74, 0x53, 0x65, 0x72,
-	0x76, 0x65, 0x72, 0x49, 0x64, 0x52, 0x65, 0x70, 0x6c, 0x79, 0x22, 0x00, 0x42, 0x3c, 0x5a, 0x3a,
-	0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x73, 0x74, 0x72, 0x75, 0x6b,
-	0x74, 0x75, 0x72, 0x61, 0x67, 0x2f, 0x6e, 0x65, 0x78, 0x74, 0x63, 0x6c, 0x6f, 0x75, 0x64, 0x2d,
-	0x73, 0x70, 0x72, 0x65, 0x65, 0x64, 0x2d, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67,
-	0x3b, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
-	0x6f, 0x33,
-})
+const file_grpc_internal_proto_rawDesc = "" +
+	"\n" +
+	"\x13grpc_internal.proto\x12\tsignaling\"\x14\n" +
+	"\x12GetServerIdRequest\"H\n" +
+	"\x10GetServerIdReply\x12\x1a\n" +
+	"\bserverId\x18\x01 \x01(\tR\bserverId\x12\x18\n" +
+	"\aversion\x18\x02 \x01(\tR\aversion2Z\n" +
+	"\vRpcInternal\x12K\n" +
+	"\vGetServerId\x12\x1d.signaling.GetServerIdRequest\x1a\x1b.signaling.GetServerIdReply\"\x00B<Z:github.com/strukturag/nextcloud-spreed-signaling;signalingb\x06proto3"
 
 var (
 	file_grpc_internal_proto_rawDescOnce sync.Once
diff --git a/grpc_mcu.pb.go b/grpc_mcu.pb.go
index 4ec0f8d..ee447ef 100644
--- a/grpc_mcu.pb.go
+++ b/grpc_mcu.pb.go
@@ -153,32 +153,20 @@ func (x *GetPublisherIdReply) GetIp() string {
 
 var File_grpc_mcu_proto protoreflect.FileDescriptor
 
-var file_grpc_mcu_proto_rawDesc = string([]byte{
-	0x0a, 0x0e, 0x67, 0x72, 0x70, 0x63, 0x5f, 0x6d, 0x63, 0x75, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x12, 0x09, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x22, 0x55, 0x0a, 0x15, 0x47,
-	0x65, 0x74, 0x50, 0x75, 0x62, 0x6c, 0x69, 0x73, 0x68, 0x65, 0x72, 0x49, 0x64, 0x52, 0x65, 0x71,
-	0x75, 0x65, 0x73, 0x74, 0x12, 0x1c, 0x0a, 0x09, 0x73, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x49,
-	0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x09, 0x73, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e,
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-	0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0a, 0x73, 0x74, 0x72, 0x65, 0x61, 0x6d, 0x54, 0x79,
-	0x70, 0x65, 0x22, 0x63, 0x0a, 0x13, 0x47, 0x65, 0x74, 0x50, 0x75, 0x62, 0x6c, 0x69, 0x73, 0x68,
-	0x65, 0x72, 0x49, 0x64, 0x52, 0x65, 0x70, 0x6c, 0x79, 0x12, 0x20, 0x0a, 0x0b, 0x70, 0x75, 0x62,
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-	0x70, 0x75, 0x62, 0x6c, 0x69, 0x73, 0x68, 0x65, 0x72, 0x49, 0x64, 0x12, 0x1a, 0x0a, 0x08, 0x70,
-	0x72, 0x6f, 0x78, 0x79, 0x55, 0x72, 0x6c, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x70,
-	0x72, 0x6f, 0x78, 0x79, 0x55, 0x72, 0x6c, 0x12, 0x0e, 0x0a, 0x02, 0x69, 0x70, 0x18, 0x03, 0x20,
-	0x01, 0x28, 0x09, 0x52, 0x02, 0x69, 0x70, 0x32, 0x5e, 0x0a, 0x06, 0x52, 0x70, 0x63, 0x4d, 0x63,
-	0x75, 0x12, 0x54, 0x0a, 0x0e, 0x47, 0x65, 0x74, 0x50, 0x75, 0x62, 0x6c, 0x69, 0x73, 0x68, 0x65,
-	0x72, 0x49, 0x64, 0x12, 0x20, 0x2e, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x2e,
-	0x47, 0x65, 0x74, 0x50, 0x75, 0x62, 0x6c, 0x69, 0x73, 0x68, 0x65, 0x72, 0x49, 0x64, 0x52, 0x65,
-	0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1e, 0x2e, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e,
-	0x67, 0x2e, 0x47, 0x65, 0x74, 0x50, 0x75, 0x62, 0x6c, 0x69, 0x73, 0x68, 0x65, 0x72, 0x49, 0x64,
-	0x52, 0x65, 0x70, 0x6c, 0x79, 0x22, 0x00, 0x42, 0x3c, 0x5a, 0x3a, 0x67, 0x69, 0x74, 0x68, 0x75,
-	0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x73, 0x74, 0x72, 0x75, 0x6b, 0x74, 0x75, 0x72, 0x61, 0x67,
-	0x2f, 0x6e, 0x65, 0x78, 0x74, 0x63, 0x6c, 0x6f, 0x75, 0x64, 0x2d, 0x73, 0x70, 0x72, 0x65, 0x65,
-	0x64, 0x2d, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x3b, 0x73, 0x69, 0x67, 0x6e,
-	0x61, 0x6c, 0x69, 0x6e, 0x67, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-})
+const file_grpc_mcu_proto_rawDesc = "" +
+	"\n" +
+	"\x0egrpc_mcu.proto\x12\tsignaling\"U\n" +
+	"\x15GetPublisherIdRequest\x12\x1c\n" +
+	"\tsessionId\x18\x01 \x01(\tR\tsessionId\x12\x1e\n" +
+	"\n" +
+	"streamType\x18\x02 \x01(\tR\n" +
+	"streamType\"c\n" +
+	"\x13GetPublisherIdReply\x12 \n" +
+	"\vpublisherId\x18\x01 \x01(\tR\vpublisherId\x12\x1a\n" +
+	"\bproxyUrl\x18\x02 \x01(\tR\bproxyUrl\x12\x0e\n" +
+	"\x02ip\x18\x03 \x01(\tR\x02ip2^\n" +
+	"\x06RpcMcu\x12T\n" +
+	"\x0eGetPublisherId\x12 .signaling.GetPublisherIdRequest\x1a\x1e.signaling.GetPublisherIdReply\"\x00B<Z:github.com/strukturag/nextcloud-spreed-signaling;signalingb\x06proto3"
 
 var (
 	file_grpc_mcu_proto_rawDescOnce sync.Once
diff --git a/grpc_sessions.pb.go b/grpc_sessions.pb.go
index e560dba..7dbd91e 100644
--- a/grpc_sessions.pb.go
+++ b/grpc_sessions.pb.go
@@ -634,105 +634,51 @@ func (x *ServerSessionMessage) GetMessage() []byte {
 
 var File_grpc_sessions_proto protoreflect.FileDescriptor
 
-var file_grpc_sessions_proto_rawDesc = string([]byte{
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-})
+const file_grpc_sessions_proto_rawDesc = "" +
+	"\n" +
+	"\x13grpc_sessions.proto\x12\tsignaling\"3\n" +
+	"\x15LookupResumeIdRequest\x12\x1a\n" +
+	"\bresumeId\x18\x01 \x01(\tR\bresumeId\"3\n" +
+	"\x13LookupResumeIdReply\x12\x1c\n" +
+	"\tsessionId\x18\x01 \x01(\tR\tsessionId\"j\n" +
+	"\x16LookupSessionIdRequest\x12$\n" +
+	"\rroomSessionId\x18\x01 \x01(\tR\rroomSessionId\x12*\n" +
+	"\x10disconnectReason\x18\x02 \x01(\tR\x10disconnectReason\"4\n" +
+	"\x14LookupSessionIdReply\x12\x1c\n" +
+	"\tsessionId\x18\x01 \x01(\tR\tsessionId\"n\n" +
+	"\x16IsSessionInCallRequest\x12\x1c\n" +
+	"\tsessionId\x18\x01 \x01(\tR\tsessionId\x12\x16\n" +
+	"\x06roomId\x18\x02 \x01(\tR\x06roomId\x12\x1e\n" +
+	"\n" +
+	"backendUrl\x18\x03 \x01(\tR\n" +
+	"backendUrl\".\n" +
+	"\x14IsSessionInCallReply\x12\x16\n" +
+	"\x06inCall\x18\x01 \x01(\bR\x06inCall\"T\n" +
+	"\x1aGetInternalSessionsRequest\x12\x16\n" +
+	"\x06roomId\x18\x01 \x01(\tR\x06roomId\x12\x1e\n" +
+	"\n" +
+	"backendUrl\x18\x02 \x01(\tR\n" +
+	"backendUrl\"g\n" +
+	"\x13InternalSessionData\x12\x1c\n" +
+	"\tsessionId\x18\x01 \x01(\tR\tsessionId\x12\x16\n" +
+	"\x06inCall\x18\x02 \x01(\rR\x06inCall\x12\x1a\n" +
+	"\bfeatures\x18\x03 \x03(\tR\bfeatures\"J\n" +
+	"\x12VirtualSessionData\x12\x1c\n" +
+	"\tsessionId\x18\x01 \x01(\tR\tsessionId\x12\x16\n" +
+	"\x06inCall\x18\x02 \x01(\rR\x06inCall\"\xaf\x01\n" +
+	"\x18GetInternalSessionsReply\x12J\n" +
+	"\x10internalSessions\x18\x01 \x03(\v2\x1e.signaling.InternalSessionDataR\x10internalSessions\x12G\n" +
+	"\x0fvirtualSessions\x18\x02 \x03(\v2\x1d.signaling.VirtualSessionDataR\x0fvirtualSessions\"0\n" +
+	"\x14ClientSessionMessage\x12\x18\n" +
+	"\amessage\x18\x01 \x01(\fR\amessage\"0\n" +
+	"\x14ServerSessionMessage\x12\x18\n" +
+	"\amessage\x18\x01 \x01(\fR\amessage2\xd2\x03\n" +
+	"\vRpcSessions\x12T\n" +
+	"\x0eLookupResumeId\x12 .signaling.LookupResumeIdRequest\x1a\x1e.signaling.LookupResumeIdReply\"\x00\x12W\n" +
+	"\x0fLookupSessionId\x12!.signaling.LookupSessionIdRequest\x1a\x1f.signaling.LookupSessionIdReply\"\x00\x12W\n" +
+	"\x0fIsSessionInCall\x12!.signaling.IsSessionInCallRequest\x1a\x1f.signaling.IsSessionInCallReply\"\x00\x12c\n" +
+	"\x13GetInternalSessions\x12%.signaling.GetInternalSessionsRequest\x1a#.signaling.GetInternalSessionsReply\"\x00\x12V\n" +
+	"\fProxySession\x12\x1f.signaling.ClientSessionMessage\x1a\x1f.signaling.ServerSessionMessage\"\x00(\x010\x01B<Z:github.com/strukturag/nextcloud-spreed-signaling;signalingb\x06proto3"
 
 var (
 	file_grpc_sessions_proto_rawDescOnce sync.Once
diff --git a/session.pb.go b/session.pb.go
index 5406311..52fc4bd 100644
--- a/session.pb.go
+++ b/session.pb.go
@@ -102,24 +102,13 @@ func (x *SessionIdData) GetBackendId() string {
 
 var File_session_proto protoreflect.FileDescriptor
 
-var file_session_proto_rawDesc = string([]byte{
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-	0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67, 0x3b, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x69, 0x6e, 0x67,
-	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-})
+const file_session_proto_rawDesc = "" +
+	"\n" +
+	"\rsession.proto\x12\tsignaling\x1a\x1fgoogle/protobuf/timestamp.proto\"u\n" +
+	"\rSessionIdData\x12\x10\n" +
+	"\x03Sid\x18\x01 \x01(\x04R\x03Sid\x124\n" +
+	"\aCreated\x18\x02 \x01(\v2\x1a.google.protobuf.TimestampR\aCreated\x12\x1c\n" +
+	"\tBackendId\x18\x03 \x01(\tR\tBackendIdB<Z:github.com/strukturag/nextcloud-spreed-signaling;signalingb\x06proto3"
 
 var (
 	file_session_proto_rawDescOnce sync.Once