diff --git a/messages.pb.go b/messages.pb.go
index b65ab4e..8c62b0f 100644
--- a/messages.pb.go
+++ b/messages.pb.go
@@ -102,6 +102,7 @@ type Invitation struct {
 	Password string `protobuf:"bytes,4,opt,name=password,proto3" json:"password,omitempty"`
 	Url      string `protobuf:"bytes,5,opt,name=url,proto3" json:"url,omitempty"`
 	Expiry   int64  `protobuf:"varint,6,opt,name=expiry,proto3" json:"expiry,omitempty"`
+	Step     int32  `protobuf:"varint,7,opt,name=step,proto3" json:"step,omitempty"`
 }
 
 func (x *Invitation) Reset() {
@@ -178,6 +179,13 @@ func (x *Invitation) GetExpiry() int64 {
 	return 0
 }
 
+func (x *Invitation) GetStep() int32 {
+	if x != nil {
+		return x.Step
+	}
+	return 0
+}
+
 // structure defining a message for a server, that will be encrypted, then sent in a "packedmessage" payload
 type ToServerMessage struct {
 	state         protoimpl.MessageState
@@ -1349,7 +1357,7 @@ var file_messages_proto_rawDesc = []byte{
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@@ -1359,192 +1367,194 @@ var file_messages_proto_rawDesc = []byte{
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+	0x6f, 0x33,
 }
 
 var (
diff --git a/pb/messages.proto b/pb/messages.proto
index 0290dc4..f8f817a 100644
--- a/pb/messages.proto
+++ b/pb/messages.proto
@@ -23,6 +23,7 @@ message Invitation {
     string password = 4;
     string url = 5;
     int64 expiry = 6;
+    int32 step = 7;
 }
 
 // structure defining a message for a server, that will be encrypted, then sent in a "packedmessage" payload
diff --git a/server/invitation.go b/server/invitation.go
index 1b1496c..153dc71 100644
--- a/server/invitation.go
+++ b/server/invitation.go
@@ -29,7 +29,7 @@ func (r *RedisRouter) GetInvitation(id string, password string) ([]byte, error)
 		passRequired = true
 	}
 	if passRequired && password != expectedpass {
-		return nil, errors.New("invitation get : auth failed, wrong password")
+		return nil, errors.New("auth failed")
 	}
 	mwiv, err := r.Client.Get("mwiv:" + id).Result()
 	if err != nil {
diff --git a/server/router.go b/server/router.go
index 210924b..3b9ba3c 100644
--- a/server/router.go
+++ b/server/router.go
@@ -10,10 +10,11 @@ import (
 )
 
 type RedisRouter struct {
-	Name           string
-	ServerIdentity *Identity
-	Client         *redis.Client
-	Context        context.Context
+	Name              string
+	ServerIdentity    *Identity
+	Client            *redis.Client
+	InvitationTimeout int
+	Context           context.Context
 }
 
 func NewRedisRouter(server *Identity, url string, password string, db int) *RedisRouter {
@@ -31,7 +32,8 @@ func NewRedisRouter(server *Identity, url string, password string, db int) *Redi
 
 func (r *RedisRouter) Route(msg *meowlib.ToServerMessage) (*meowlib.FromServerMessage, error) {
 	var from_server meowlib.FromServerMessage
-	if len(msg.Messages) > 0 { // user message
+	// user message
+	if len(msg.Messages) > 0 {
 		for _, usrmsg := range msg.Messages {
 			// serialize the message to store it as byte array into redis
 			out, err := proto.Marshal(usrmsg)
@@ -42,6 +44,7 @@ func (r *RedisRouter) Route(msg *meowlib.ToServerMessage) (*meowlib.FromServerMe
 		}
 		from_server.UuidAck = msg.Uuid
 	}
+	// check for messages
 	if len(msg.PullRequest) > 0 {
 		for _, rq := range msg.PullRequest {
 			msgcnt, err := r.Client.ZCount(rq.LookupKey, "-inf", "+inf").Result()
@@ -69,7 +72,7 @@ func (r *RedisRouter) Route(msg *meowlib.ToServerMessage) (*meowlib.FromServerMe
 
 		}
 	}
-
+	// manage Matriochka
 	if msg.MatriochkaMessage != nil {
 		out, err := proto.Marshal(msg)
 		if err != nil {
@@ -81,9 +84,39 @@ func (r *RedisRouter) Route(msg *meowlib.ToServerMessage) (*meowlib.FromServerMe
 		}
 		from_server.UuidAck = msg.Uuid
 	}
-
+	// Server list exchange
 	if len(msg.KnownServers) > 0 {
 
+	}
+	// Through server invitation process
+	if msg.Invitation != nil {
+		switch msg.Invitation.Step {
+		case 1: // create invitation
+			url, expiry := r.CreateInvitation(msg.Invitation.Payload, int(msg.Invitation.Timeout), msg.Invitation.Password, r.InvitationTimeout, int(msg.Invitation.Urllen))
+			from_server.Invitation.Url = url
+			from_server.Invitation.Expiry = expiry.UTC().Unix()
+		case 2: // get invitation
+			invitation, err := r.GetInvitation(msg.Invitation.Url, msg.Invitation.Password)
+			if err != nil {
+				if err.Error() == "auth failed" {
+					from_server.Invitation.Payload = []byte("authentication failure")
+				} else {
+					from_server.Invitation.Payload = []byte("invitation expired")
+				}
+			} else {
+				from_server.Invitation.Payload = invitation
+			}
+		case 3: // answer invitation
+			expiry := r.AnswerInvitation(msg.Invitation.Url, int(msg.Invitation.Timeout), msg.Invitation.Payload, r.InvitationTimeout)
+			from_server.Invitation.Expiry = expiry.UTC().Unix()
+		case 4: // get answer
+			answer, err := r.GetInvitationAnswer(msg.Invitation.Url)
+			if err != nil {
+				from_server.Invitation.Payload = []byte("invitation expired")
+			} else {
+				from_server.Invitation.Payload = answer
+			}
+		}
 	}
 	/*