diff --git a/client/helpers/call.go b/client/helpers/call.go
new file mode 100644
index 0000000..89838e4
--- /dev/null
+++ b/client/helpers/call.go
@@ -0,0 +1,55 @@
+package helpers
+
+import (
+	"forge.redroom.link/yves/meowlib"
+	"forge.redroom.link/yves/meowlib/client"
+)
+
+func BuildCallRequestMessage(users []string, expiry uint64, srvuid string) ([]byte, string, error) {
+	// Server: get the invitation server
+	server, err := client.GetConfig().GetIdentity().MessageServers.LoadServer(srvuid)
+	if err != nil {
+		return nil, "BuildCallRequestMessage: LoadServer", err
+	}
+
+	toSrvMsg, err := server.BuildVideoRoomRequestMessage(users, expiry)
+	if err != nil {
+		return nil, "BuildCallRequestMessage: BuildVideoRoomRequestMessage", err
+	}
+	msg, err := server.ProcessOutboundMessage(toSrvMsg)
+	if err != nil {
+		return nil, "BuildCallRequestMessage: ProcessOutboundMessage", err
+	}
+	return msg, "", nil
+}
+
+func ReadCallRequestResponseMessage(data []byte, srvuid string) (*meowlib.VideoData, string, error) {
+	server, err := client.GetConfig().GetIdentity().MessageServers.LoadServer(srvuid)
+	if err != nil {
+		return nil, "ReadCallRequestResponseMessage: LoadServer", err
+	}
+	// Server inbound processing : get the invitation server
+	serverMsg, err := server.ProcessInboundServerResponse(data)
+	if err != nil {
+		return nil, "ReadCallRequestResponseMessage: ProcessInboundServerResponse", err
+	}
+	return serverMsg.VideoData, "", nil
+}
+
+func BuildCallMessage(videodata *meowlib.VideoData, srvuid string, peer_idx int, replyToUid string, filelist []string) ([]byte, string, error) {
+	peer := client.GetConfig().GetIdentity().Peers[peer_idx]
+
+	// Creating User message
+	usermessage, err := peer.BuildSimpleUserMessage(nil)
+	if err != nil {
+		return nil, "BuildCallMessage : BuildSimpleUserMessage", err
+	}
+
+	usermessage.Status.AnswerToUuid = replyToUid
+
+	return messageBuildPostprocess(usermessage, srvuid, peer)
+}
+
+func BuildCancelCallMessage() {
+
+}
diff --git a/client/helpers/messageHelper.go b/client/helpers/messageHelper.go
index d8a2dc1..a20af61 100644
--- a/client/helpers/messageHelper.go
+++ b/client/helpers/messageHelper.go
@@ -1,16 +1,39 @@
 package helpers
 
 import (
+	"forge.redroom.link/yves/meowlib"
 	"forge.redroom.link/yves/meowlib/client"
 )
 
+func messageBuildPostprocess(msg *meowlib.UserMessage, srvuid string, peer *client.Peer) ([]byte, string, error) {
+	// Get the message server
+	srv, err := client.GetConfig().GetIdentity().MessageServers.LoadServer(srvuid)
+	if err != nil {
+		return nil, "messageBuildPostprocess : LoadServer", err
+	}
+	// Prepare cyphered + packed user message
+	packedMsg, err := peer.ProcessOutboundUserMessage(msg)
+	if err != nil {
+		return nil, "messageBuildPostprocess : ProcessOutboundUserMessage", err
+	}
+	// Creating Server message for transporting the user message
+	toServerMessage := srv.BuildToServerMessageFromUserMessage(packedMsg)
+	data, err := srv.ProcessOutboundMessage(toServerMessage)
+	if err != nil {
+		return nil, "messageBuildPostprocess : ProcessOutboundMessage", err
+	}
+	// Store message
+	err = peer.StoreMessage(msg, nil)
+	if err != nil {
+		return nil, "messageBuildPostprocess : StoreMessage", err
+	}
+	return data, "", nil
+}
+
 func PrepareUserMessage(message string, srvuid string, peer_idx int, replyToUid string, filelist []string) ([]byte, string, error) {
 
 	peer := client.GetConfig().GetIdentity().Peers[peer_idx]
-	srv, err := client.GetConfig().GetIdentity().MessageServers.LoadServer(srvuid)
-	if err != nil {
-		return nil, "PrepareServerMessage : LoadServer", err
-	}
+
 	// Creating User message
 	usermessage, err := peer.BuildSimpleUserMessage([]byte(message))
 	if err != nil {
@@ -23,23 +46,9 @@ func PrepareUserMessage(message string, srvuid string, peer_idx int, replyToUid
 		}
 	}
 	usermessage.Status.AnswerToUuid = replyToUid
-	// Prepare cyphered + packed user message
-	packedMsg, err := peer.ProcessOutboundUserMessage(usermessage)
-	if err != nil {
-		return nil, "PrepareServerMessage : ProcessOutboundUserMessage", err
-	}
-	// Creating Server message for transporting the user message
-	toServerMessage := srv.BuildToServerMessageFromUserMessage(packedMsg)
-	data, err := srv.ProcessOutboundMessage(toServerMessage)
-	if err != nil {
-		return nil, "PrepareServerMessage : ProcessOutboundMessage", err
-	}
-	// Store message
-	err = peer.StoreMessage(usermessage, filelist)
-	if err != nil {
-		return nil, "PrepareServerMessage : StoreMessage", err
-	}
-	return data, "", nil
+
+	return messageBuildPostprocess(usermessage, srvuid, peer)
+
 }
 
 func SendAck(messageUid string, srvuid string, peer_idx int, received int64, processed int64) ([]byte, string, error) {
diff --git a/client/peerstorage.go b/client/peerstorage.go
index 2a9a918..aa7cd42 100644
--- a/client/peerstorage.go
+++ b/client/peerstorage.go
@@ -15,6 +15,7 @@ import (
 type PeerStorage struct {
 	DbFile string `json:"db_file,omitempty"`
 	db     *badger.DB
+	cache  map[string]*Peer
 }
 
 // Open a badger database from struct PeerStorage
diff --git a/client/server.go b/client/server.go
index d6ebdbc..152bb6f 100644
--- a/client/server.go
+++ b/client/server.go
@@ -168,7 +168,7 @@ func (ints *Server) BuildMessageRequestMessage(lookupKeys []string) ([]byte, err
 }
 
 // BuildVideoRoomRequestMessage creates a video room request to server and returns it as protobuf serialized byte array
-func (ints *Server) BuildVideoRoomRequestMessage(users []string, expiry uint64) ([]byte, error) {
+func (ints *Server) BuildVideoRoomRequestMessage(users []string, expiry uint64) (*meowlib.ToServerMessage, error) {
 	var msg meowlib.ToServerMessage
 	msg.Uuid = uuid.New().String()
 	msg.Type = "1"
@@ -181,11 +181,7 @@ func (ints *Server) BuildVideoRoomRequestMessage(users []string, expiry uint64)
 		}
 	}
 	msg.VideoData.Credentials = videocreds
-	out, err := proto.Marshal(&msg)
-	if err != nil {
-		return nil, err
-	}
-	return out, nil
+	return &msg, nil
 }
 
 // BuildToServerMessageInvitation creates an invitation message to server and returns it as a meowlib.ToServerMessage
diff --git a/pb/messages.proto b/pb/messages.proto
index 834bc13..13b73f3 100644
--- a/pb/messages.proto
+++ b/pb/messages.proto
@@ -33,7 +33,6 @@ message Invitation {
     string from=9; // used in step 3 the answer public key to check the signature in user message
 }
 
-
 // structure for requesting incoming messages
 message ConversationRequest {  
     string lookup_key = 1; // lookup key for a conversation
@@ -91,6 +90,8 @@ message FromServerMessage {
     repeated PackedUserMessage device_messages = 9; // messages from other devices belonging to the same user
 
     VideoData video_data = 10; // video call data
+
+    repeated ContactCard contactCard = 11;  // contact list for a personae
 }
 
 message MatriochkaServer {
diff --git a/server/videoserver.go b/server/videoserver.go
index bd2ec6b..b9db8cf 100644
--- a/server/videoserver.go
+++ b/server/videoserver.go
@@ -10,7 +10,7 @@ import (
 type VideoServer struct {
 	Url       string `json:"url,omitempty"`
 	ApiKey    string `json:"api_key,omitempty"`
-	ApiSecret string `json:"secret,omitempty"`
+	ApiSecret string `json:"api_secret,omitempty"`
 }
 
 func (s *VideoServer) GetJoinToken(room, username string, validity time.Duration) (string, error) {