diff --git a/pbx/model.pb.go b/pbx/model.pb.go
index ff8355b9..cfdd6410 100644
--- a/pbx/model.pb.go
+++ b/pbx/model.pb.go
@@ -50,7 +50,7 @@ func (x AuthLevel) String() string {
 	return proto.EnumName(AuthLevel_name, int32(x))
 }
 func (AuthLevel) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{0}
+	return fileDescriptor_model_92588c8639c67d56, []int{0}
 }
 
 type InfoNote int32
@@ -76,7 +76,7 @@ func (x InfoNote) String() string {
 	return proto.EnumName(InfoNote_name, int32(x))
 }
 func (InfoNote) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{1}
+	return fileDescriptor_model_92588c8639c67d56, []int{1}
 }
 
 // Plugin response codes
@@ -111,7 +111,7 @@ func (x RespCode) String() string {
 	return proto.EnumName(RespCode_name, int32(x))
 }
 func (RespCode) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{2}
+	return fileDescriptor_model_92588c8639c67d56, []int{2}
 }
 
 type Crud int32
@@ -137,7 +137,7 @@ func (x Crud) String() string {
 	return proto.EnumName(Crud_name, int32(x))
 }
 func (Crud) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{3}
+	return fileDescriptor_model_92588c8639c67d56, []int{3}
 }
 
 // What to delete, either "msg" to delete messages (default) or "topic" to delete the topic or "sub"
@@ -171,7 +171,7 @@ func (x ClientDel_What) String() string {
 	return proto.EnumName(ClientDel_What_name, int32(x))
 }
 func (ClientDel_What) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{18, 0}
+	return fileDescriptor_model_92588c8639c67d56, []int{18, 0}
 }
 
 type ServerPres_What int32
@@ -224,7 +224,7 @@ func (x ServerPres_What) String() string {
 	return proto.EnumName(ServerPres_What_name, int32(x))
 }
 func (ServerPres_What) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{27, 0}
+	return fileDescriptor_model_92588c8639c67d56, []int{27, 0}
 }
 
 // Dummy placeholder message.
@@ -238,7 +238,7 @@ func (m *Unused) Reset()         { *m = Unused{} }
 func (m *Unused) String() string { return proto.CompactTextString(m) }
 func (*Unused) ProtoMessage()    {}
 func (*Unused) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{0}
+	return fileDescriptor_model_92588c8639c67d56, []int{0}
 }
 func (m *Unused) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Unused.Unmarshal(m, b)
@@ -271,7 +271,7 @@ func (m *DefaultAcsMode) Reset()         { *m = DefaultAcsMode{} }
 func (m *DefaultAcsMode) String() string { return proto.CompactTextString(m) }
 func (*DefaultAcsMode) ProtoMessage()    {}
 func (*DefaultAcsMode) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{1}
+	return fileDescriptor_model_92588c8639c67d56, []int{1}
 }
 func (m *DefaultAcsMode) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DefaultAcsMode.Unmarshal(m, b)
@@ -320,7 +320,7 @@ func (m *AccessMode) Reset()         { *m = AccessMode{} }
 func (m *AccessMode) String() string { return proto.CompactTextString(m) }
 func (*AccessMode) ProtoMessage()    {}
 func (*AccessMode) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{2}
+	return fileDescriptor_model_92588c8639c67d56, []int{2}
 }
 func (m *AccessMode) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_AccessMode.Unmarshal(m, b)
@@ -369,7 +369,7 @@ func (m *SetSub) Reset()         { *m = SetSub{} }
 func (m *SetSub) String() string { return proto.CompactTextString(m) }
 func (*SetSub) ProtoMessage()    {}
 func (*SetSub) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{3}
+	return fileDescriptor_model_92588c8639c67d56, []int{3}
 }
 func (m *SetSub) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SetSub.Unmarshal(m, b)
@@ -411,18 +411,18 @@ type ClientCred struct {
 	Value string `protobuf:"bytes,2,opt,name=value" json:"value,omitempty"`
 	// Verification response
 	Response string `protobuf:"bytes,3,opt,name=response" json:"response,omitempty"`
-	// Request parameters, such as preferences.
-	Params               []byte   `protobuf:"bytes,4,opt,name=params,proto3" json:"params,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	// Request parameters, such as preferences or country code.
+	Params               map[string][]byte `protobuf:"bytes,4,rep,name=params" json:"params,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
 }
 
 func (m *ClientCred) Reset()         { *m = ClientCred{} }
 func (m *ClientCred) String() string { return proto.CompactTextString(m) }
 func (*ClientCred) ProtoMessage()    {}
 func (*ClientCred) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{4}
+	return fileDescriptor_model_92588c8639c67d56, []int{4}
 }
 func (m *ClientCred) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientCred.Unmarshal(m, b)
@@ -463,7 +463,7 @@ func (m *ClientCred) GetResponse() string {
 	return ""
 }
 
-func (m *ClientCred) GetParams() []byte {
+func (m *ClientCred) GetParams() map[string][]byte {
 	if m != nil {
 		return m.Params
 	}
@@ -484,7 +484,7 @@ func (m *SetDesc) Reset()         { *m = SetDesc{} }
 func (m *SetDesc) String() string { return proto.CompactTextString(m) }
 func (*SetDesc) ProtoMessage()    {}
 func (*SetDesc) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{5}
+	return fileDescriptor_model_92588c8639c67d56, []int{5}
 }
 func (m *SetDesc) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SetDesc.Unmarshal(m, b)
@@ -547,7 +547,7 @@ func (m *GetOpts) Reset()         { *m = GetOpts{} }
 func (m *GetOpts) String() string { return proto.CompactTextString(m) }
 func (*GetOpts) ProtoMessage()    {}
 func (*GetOpts) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{6}
+	return fileDescriptor_model_92588c8639c67d56, []int{6}
 }
 func (m *GetOpts) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetOpts.Unmarshal(m, b)
@@ -626,7 +626,7 @@ func (m *GetQuery) Reset()         { *m = GetQuery{} }
 func (m *GetQuery) String() string { return proto.CompactTextString(m) }
 func (*GetQuery) ProtoMessage()    {}
 func (*GetQuery) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{7}
+	return fileDescriptor_model_92588c8639c67d56, []int{7}
 }
 func (m *GetQuery) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetQuery.Unmarshal(m, b)
@@ -692,7 +692,7 @@ func (m *SetQuery) Reset()         { *m = SetQuery{} }
 func (m *SetQuery) String() string { return proto.CompactTextString(m) }
 func (*SetQuery) ProtoMessage()    {}
 func (*SetQuery) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{8}
+	return fileDescriptor_model_92588c8639c67d56, []int{8}
 }
 func (m *SetQuery) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SetQuery.Unmarshal(m, b)
@@ -752,7 +752,7 @@ func (m *SeqRange) Reset()         { *m = SeqRange{} }
 func (m *SeqRange) String() string { return proto.CompactTextString(m) }
 func (*SeqRange) ProtoMessage()    {}
 func (*SeqRange) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{9}
+	return fileDescriptor_model_92588c8639c67d56, []int{9}
 }
 func (m *SeqRange) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SeqRange.Unmarshal(m, b)
@@ -804,7 +804,7 @@ func (m *ClientHi) Reset()         { *m = ClientHi{} }
 func (m *ClientHi) String() string { return proto.CompactTextString(m) }
 func (*ClientHi) ProtoMessage()    {}
 func (*ClientHi) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{10}
+	return fileDescriptor_model_92588c8639c67d56, []int{10}
 }
 func (m *ClientHi) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientHi.Unmarshal(m, b)
@@ -903,7 +903,7 @@ func (m *ClientAcc) Reset()         { *m = ClientAcc{} }
 func (m *ClientAcc) String() string { return proto.CompactTextString(m) }
 func (*ClientAcc) ProtoMessage()    {}
 func (*ClientAcc) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{11}
+	return fileDescriptor_model_92588c8639c67d56, []int{11}
 }
 func (m *ClientAcc) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientAcc.Unmarshal(m, b)
@@ -1011,7 +1011,7 @@ func (m *ClientLogin) Reset()         { *m = ClientLogin{} }
 func (m *ClientLogin) String() string { return proto.CompactTextString(m) }
 func (*ClientLogin) ProtoMessage()    {}
 func (*ClientLogin) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{12}
+	return fileDescriptor_model_92588c8639c67d56, []int{12}
 }
 func (m *ClientLogin) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientLogin.Unmarshal(m, b)
@@ -1076,7 +1076,7 @@ func (m *ClientSub) Reset()         { *m = ClientSub{} }
 func (m *ClientSub) String() string { return proto.CompactTextString(m) }
 func (*ClientSub) ProtoMessage()    {}
 func (*ClientSub) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{13}
+	return fileDescriptor_model_92588c8639c67d56, []int{13}
 }
 func (m *ClientSub) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientSub.Unmarshal(m, b)
@@ -1138,7 +1138,7 @@ func (m *ClientLeave) Reset()         { *m = ClientLeave{} }
 func (m *ClientLeave) String() string { return proto.CompactTextString(m) }
 func (*ClientLeave) ProtoMessage()    {}
 func (*ClientLeave) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{14}
+	return fileDescriptor_model_92588c8639c67d56, []int{14}
 }
 func (m *ClientLeave) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientLeave.Unmarshal(m, b)
@@ -1195,7 +1195,7 @@ func (m *ClientPub) Reset()         { *m = ClientPub{} }
 func (m *ClientPub) String() string { return proto.CompactTextString(m) }
 func (*ClientPub) ProtoMessage()    {}
 func (*ClientPub) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{15}
+	return fileDescriptor_model_92588c8639c67d56, []int{15}
 }
 func (m *ClientPub) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientPub.Unmarshal(m, b)
@@ -1264,7 +1264,7 @@ func (m *ClientGet) Reset()         { *m = ClientGet{} }
 func (m *ClientGet) String() string { return proto.CompactTextString(m) }
 func (*ClientGet) ProtoMessage()    {}
 func (*ClientGet) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{16}
+	return fileDescriptor_model_92588c8639c67d56, []int{16}
 }
 func (m *ClientGet) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientGet.Unmarshal(m, b)
@@ -1319,7 +1319,7 @@ func (m *ClientSet) Reset()         { *m = ClientSet{} }
 func (m *ClientSet) String() string { return proto.CompactTextString(m) }
 func (*ClientSet) ProtoMessage()    {}
 func (*ClientSet) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{17}
+	return fileDescriptor_model_92588c8639c67d56, []int{17}
 }
 func (m *ClientSet) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientSet.Unmarshal(m, b)
@@ -1382,7 +1382,7 @@ func (m *ClientDel) Reset()         { *m = ClientDel{} }
 func (m *ClientDel) String() string { return proto.CompactTextString(m) }
 func (*ClientDel) ProtoMessage()    {}
 func (*ClientDel) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{18}
+	return fileDescriptor_model_92588c8639c67d56, []int{18}
 }
 func (m *ClientDel) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientDel.Unmarshal(m, b)
@@ -1467,7 +1467,7 @@ func (m *ClientNote) Reset()         { *m = ClientNote{} }
 func (m *ClientNote) String() string { return proto.CompactTextString(m) }
 func (*ClientNote) ProtoMessage()    {}
 func (*ClientNote) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{19}
+	return fileDescriptor_model_92588c8639c67d56, []int{19}
 }
 func (m *ClientNote) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientNote.Unmarshal(m, b)
@@ -1533,7 +1533,7 @@ func (m *ClientMsg) Reset()         { *m = ClientMsg{} }
 func (m *ClientMsg) String() string { return proto.CompactTextString(m) }
 func (*ClientMsg) ProtoMessage()    {}
 func (*ClientMsg) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{20}
+	return fileDescriptor_model_92588c8639c67d56, []int{20}
 }
 func (m *ClientMsg) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientMsg.Unmarshal(m, b)
@@ -1933,7 +1933,7 @@ func (m *ServerCred) Reset()         { *m = ServerCred{} }
 func (m *ServerCred) String() string { return proto.CompactTextString(m) }
 func (*ServerCred) ProtoMessage()    {}
 func (*ServerCred) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{21}
+	return fileDescriptor_model_92588c8639c67d56, []int{21}
 }
 func (m *ServerCred) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ServerCred.Unmarshal(m, b)
@@ -1998,7 +1998,7 @@ func (m *TopicDesc) Reset()         { *m = TopicDesc{} }
 func (m *TopicDesc) String() string { return proto.CompactTextString(m) }
 func (*TopicDesc) ProtoMessage()    {}
 func (*TopicDesc) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{22}
+	return fileDescriptor_model_92588c8639c67d56, []int{22}
 }
 func (m *TopicDesc) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_TopicDesc.Unmarshal(m, b)
@@ -2140,7 +2140,7 @@ func (m *TopicSub) Reset()         { *m = TopicSub{} }
 func (m *TopicSub) String() string { return proto.CompactTextString(m) }
 func (*TopicSub) ProtoMessage()    {}
 func (*TopicSub) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{23}
+	return fileDescriptor_model_92588c8639c67d56, []int{23}
 }
 func (m *TopicSub) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_TopicSub.Unmarshal(m, b)
@@ -2277,7 +2277,7 @@ func (m *DelValues) Reset()         { *m = DelValues{} }
 func (m *DelValues) String() string { return proto.CompactTextString(m) }
 func (*DelValues) ProtoMessage()    {}
 func (*DelValues) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{24}
+	return fileDescriptor_model_92588c8639c67d56, []int{24}
 }
 func (m *DelValues) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DelValues.Unmarshal(m, b)
@@ -2327,7 +2327,7 @@ func (m *ServerCtrl) Reset()         { *m = ServerCtrl{} }
 func (m *ServerCtrl) String() string { return proto.CompactTextString(m) }
 func (*ServerCtrl) ProtoMessage()    {}
 func (*ServerCtrl) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{25}
+	return fileDescriptor_model_92588c8639c67d56, []int{25}
 }
 func (m *ServerCtrl) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ServerCtrl.Unmarshal(m, b)
@@ -2403,7 +2403,7 @@ func (m *ServerData) Reset()         { *m = ServerData{} }
 func (m *ServerData) String() string { return proto.CompactTextString(m) }
 func (*ServerData) ProtoMessage()    {}
 func (*ServerData) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{26}
+	return fileDescriptor_model_92588c8639c67d56, []int{26}
 }
 func (m *ServerData) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ServerData.Unmarshal(m, b)
@@ -2493,7 +2493,7 @@ func (m *ServerPres) Reset()         { *m = ServerPres{} }
 func (m *ServerPres) String() string { return proto.CompactTextString(m) }
 func (*ServerPres) ProtoMessage()    {}
 func (*ServerPres) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{27}
+	return fileDescriptor_model_92588c8639c67d56, []int{27}
 }
 func (m *ServerPres) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ServerPres.Unmarshal(m, b)
@@ -2601,7 +2601,7 @@ func (m *ServerMeta) Reset()         { *m = ServerMeta{} }
 func (m *ServerMeta) String() string { return proto.CompactTextString(m) }
 func (*ServerMeta) ProtoMessage()    {}
 func (*ServerMeta) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{28}
+	return fileDescriptor_model_92588c8639c67d56, []int{28}
 }
 func (m *ServerMeta) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ServerMeta.Unmarshal(m, b)
@@ -2685,7 +2685,7 @@ func (m *ServerInfo) Reset()         { *m = ServerInfo{} }
 func (m *ServerInfo) String() string { return proto.CompactTextString(m) }
 func (*ServerInfo) ProtoMessage()    {}
 func (*ServerInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{29}
+	return fileDescriptor_model_92588c8639c67d56, []int{29}
 }
 func (m *ServerInfo) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ServerInfo.Unmarshal(m, b)
@@ -2753,7 +2753,7 @@ func (m *ServerMsg) Reset()         { *m = ServerMsg{} }
 func (m *ServerMsg) String() string { return proto.CompactTextString(m) }
 func (*ServerMsg) ProtoMessage()    {}
 func (*ServerMsg) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{30}
+	return fileDescriptor_model_92588c8639c67d56, []int{30}
 }
 func (m *ServerMsg) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ServerMsg.Unmarshal(m, b)
@@ -2992,7 +2992,7 @@ func (m *ServerResp) Reset()         { *m = ServerResp{} }
 func (m *ServerResp) String() string { return proto.CompactTextString(m) }
 func (*ServerResp) ProtoMessage()    {}
 func (*ServerResp) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{31}
+	return fileDescriptor_model_92588c8639c67d56, []int{31}
 }
 func (m *ServerResp) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ServerResp.Unmarshal(m, b)
@@ -3051,7 +3051,7 @@ func (m *Session) Reset()         { *m = Session{} }
 func (m *Session) String() string { return proto.CompactTextString(m) }
 func (*Session) ProtoMessage()    {}
 func (*Session) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{32}
+	return fileDescriptor_model_92588c8639c67d56, []int{32}
 }
 func (m *Session) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Session.Unmarshal(m, b)
@@ -3132,7 +3132,7 @@ func (m *ClientReq) Reset()         { *m = ClientReq{} }
 func (m *ClientReq) String() string { return proto.CompactTextString(m) }
 func (*ClientReq) ProtoMessage()    {}
 func (*ClientReq) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{33}
+	return fileDescriptor_model_92588c8639c67d56, []int{33}
 }
 func (m *ClientReq) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ClientReq.Unmarshal(m, b)
@@ -3178,7 +3178,7 @@ func (m *SearchQuery) Reset()         { *m = SearchQuery{} }
 func (m *SearchQuery) String() string { return proto.CompactTextString(m) }
 func (*SearchQuery) ProtoMessage()    {}
 func (*SearchQuery) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{34}
+	return fileDescriptor_model_92588c8639c67d56, []int{34}
 }
 func (m *SearchQuery) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SearchQuery.Unmarshal(m, b)
@@ -3227,7 +3227,7 @@ func (m *SearchFound) Reset()         { *m = SearchFound{} }
 func (m *SearchFound) String() string { return proto.CompactTextString(m) }
 func (*SearchFound) ProtoMessage()    {}
 func (*SearchFound) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{35}
+	return fileDescriptor_model_92588c8639c67d56, []int{35}
 }
 func (m *SearchFound) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SearchFound.Unmarshal(m, b)
@@ -3281,7 +3281,7 @@ func (m *TopicEvent) Reset()         { *m = TopicEvent{} }
 func (m *TopicEvent) String() string { return proto.CompactTextString(m) }
 func (*TopicEvent) ProtoMessage()    {}
 func (*TopicEvent) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{36}
+	return fileDescriptor_model_92588c8639c67d56, []int{36}
 }
 func (m *TopicEvent) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_TopicEvent.Unmarshal(m, b)
@@ -3338,7 +3338,7 @@ func (m *AccountEvent) Reset()         { *m = AccountEvent{} }
 func (m *AccountEvent) String() string { return proto.CompactTextString(m) }
 func (*AccountEvent) ProtoMessage()    {}
 func (*AccountEvent) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{37}
+	return fileDescriptor_model_92588c8639c67d56, []int{37}
 }
 func (m *AccountEvent) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_AccountEvent.Unmarshal(m, b)
@@ -3411,7 +3411,7 @@ func (m *SubscriptionEvent) Reset()         { *m = SubscriptionEvent{} }
 func (m *SubscriptionEvent) String() string { return proto.CompactTextString(m) }
 func (*SubscriptionEvent) ProtoMessage()    {}
 func (*SubscriptionEvent) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{38}
+	return fileDescriptor_model_92588c8639c67d56, []int{38}
 }
 func (m *SubscriptionEvent) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SubscriptionEvent.Unmarshal(m, b)
@@ -3499,7 +3499,7 @@ func (m *MessageEvent) Reset()         { *m = MessageEvent{} }
 func (m *MessageEvent) String() string { return proto.CompactTextString(m) }
 func (*MessageEvent) ProtoMessage()    {}
 func (*MessageEvent) Descriptor() ([]byte, []int) {
-	return fileDescriptor_model_45d32aef7fcc5f78, []int{39}
+	return fileDescriptor_model_92588c8639c67d56, []int{39}
 }
 func (m *MessageEvent) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_MessageEvent.Unmarshal(m, b)
@@ -3539,6 +3539,7 @@ func init() {
 	proto.RegisterType((*AccessMode)(nil), "pbx.AccessMode")
 	proto.RegisterType((*SetSub)(nil), "pbx.SetSub")
 	proto.RegisterType((*ClientCred)(nil), "pbx.ClientCred")
+	proto.RegisterMapType((map[string][]byte)(nil), "pbx.ClientCred.ParamsEntry")
 	proto.RegisterType((*SetDesc)(nil), "pbx.SetDesc")
 	proto.RegisterType((*GetOpts)(nil), "pbx.GetOpts")
 	proto.RegisterType((*GetQuery)(nil), "pbx.GetQuery")
@@ -3942,172 +3943,172 @@ var _Plugin_serviceDesc = grpc.ServiceDesc{
 	Metadata: "model.proto",
 }
 
-func init() { proto.RegisterFile("model.proto", fileDescriptor_model_45d32aef7fcc5f78) }
+func init() { proto.RegisterFile("model.proto", fileDescriptor_model_92588c8639c67d56) }
 
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 }
diff --git a/pbx/model.proto b/pbx/model.proto
index bca625a0..33ad8892 100644
--- a/pbx/model.proto
+++ b/pbx/model.proto
@@ -82,8 +82,8 @@ message ClientCred {
 	string value = 2;
 	// Verification response
 	string response = 3;
-	// Request parameters, such as preferences.
-	bytes params = 4;
+	// Request parameters, such as preferences or country code.
+	map<string, bytes> params = 4;
 }
 
 // SetDesc: C2S in set.what == "desc" and sub.init message
diff --git a/py_grpc/tinode_grpc/model_pb2.py b/py_grpc/tinode_grpc/model_pb2.py
index c4d31cba..458ce466 100644
--- a/py_grpc/tinode_grpc/model_pb2.py
+++ b/py_grpc/tinode_grpc/model_pb2.py
@@ -20,7 +20,7 @@ DESCRIPTOR = _descriptor.FileDescriptor(
   package='pbx',
   syntax='proto3',
   serialized_options=None,
-  serialized_pb=_b('\n\x0bmodel.proto\x12\x03pbx\"\x08\n\x06Unused\",\n\x0e\x44\x65\x66\x61ultAcsMode\x12\x0c\n\x04\x61uth\x18\x01 \x01(\t\x12\x0c\n\x04\x61non\x18\x02 \x01(\t\")\n\nAccessMode\x12\x0c\n\x04want\x18\x01 \x01(\t\x12\r\n\x05given\x18\x02 \x01(\t\"\'\n\x06SetSub\x12\x0f\n\x07user_id\x18\x01 \x01(\t\x12\x0c\n\x04mode\x18\x02 \x01(\t\"M\n\nClientCred\x12\x0e\n\x06method\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t\x12\x10\n\x08response\x18\x03 \x01(\t\x12\x0e\n\x06params\x18\x04 \x01(\x0c\"T\n\x07SetDesc\x12(\n\x0b\x64\x65\x66\x61ult_acs\x18\x01 \x01(\x0b\x32\x13.pbx.DefaultAcsMode\x12\x0e\n\x06public\x18\x02 \x01(\x0c\x12\x0f\n\x07private\x18\x03 \x01(\x0c\"u\n\x07GetOpts\x12\x19\n\x11if_modified_since\x18\x01 \x01(\x03\x12\x0c\n\x04user\x18\x02 \x01(\t\x12\r\n\x05topic\x18\x03 \x01(\t\x12\x10\n\x08since_id\x18\x04 \x01(\x05\x12\x11\n\tbefore_id\x18\x05 \x01(\x05\x12\r\n\x05limit\x18\x06 \x01(\x05\"k\n\x08GetQuery\x12\x0c\n\x04what\x18\x01 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\x01(\x05\x12\x0f\n\x07recv_id\x18\x06 \x01(\x05\x12\x1d\n\x04mode\x18\x07 \x01(\x0b\x32\x0f.pbx.AccessMode\x12\x0f\n\x07private\x18\x08 \x01(\x0c\"G\n\x0cMessageEvent\x12\x19\n\x06\x61\x63tion\x18\x01 \x01(\x0e\x32\t.pbx.Crud\x12\x1c\n\x03msg\x18\x02 \x01(\x0b\x32\x0f.pbx.ServerData*3\n\tAuthLevel\x12\x08\n\x04NONE\x10\x00\x12\x08\n\x04\x41NON\x10\n\x12\x08\n\x04\x41UTH\x10\x14\x12\x08\n\x04ROOT\x10\x1e*&\n\x08InfoNote\x12\x08\n\x04READ\x10\x00\x12\x08\n\x04RECV\x10\x01\x12\x06\n\x02KP\x10\x02*<\n\x08RespCode\x12\x0c\n\x08\x43ONTINUE\x10\x00\x12\x08\n\x04\x44ROP\x10\x01\x12\x0b\n\x07RESPOND\x10\x02\x12\x0b\n\x07REPLACE\x10\x03**\n\x04\x43rud\x12\n\n\x06\x43REATE\x10\x00\x12\n\n\x06UPDATE\x10\x01\x12\n\n\x06\x44\x45LETE\x10\x02\x32;\n\x04Node\x12\x33\n\x0bMessageLoop\x12\x0e.pbx.ClientMsg\x1a\x0e.pbx.ServerMsg\"\x00(\x01\x30\x01\x32\x9f\x02\n\x06Plugin\x12-\n\x08\x46ireHose\x12\x0e.pbx.ClientReq\x1a\x0f.pbx.ServerResp\"\x00\x12,\n\x04\x46ind\x12\x10.pbx.SearchQuery\x1a\x10.pbx.SearchFound\"\x00\x12+\n\x07\x41\x63\x63ount\x12\x11.pbx.AccountEvent\x1a\x0b.pbx.Unused\"\x00\x12\'\n\x05Topic\x12\x0f.pbx.TopicEvent\x1a\x0b.pbx.Unused\"\x00\x12\x35\n\x0cSubscription\x12\x16.pbx.SubscriptionEvent\x1a\x0b.pbx.Unused\"\x00\x12+\n\x07Message\x12\x11.pbx.MessageEvent\x1a\x0b.pbx.Unused\"\x00\x62\x06proto3')
 )
 
 _AUTHLEVEL = _descriptor.EnumDescriptor(
@@ -48,8 +48,8 @@ _AUTHLEVEL = _descriptor.EnumDescriptor(
   ],
   containing_type=None,
   serialized_options=None,
-  serialized_start=5132,
-  serialized_end=5183,
+  serialized_start=5209,
+  serialized_end=5260,
 )
 _sym_db.RegisterEnumDescriptor(_AUTHLEVEL)
 
@@ -75,8 +75,8 @@ _INFONOTE = _descriptor.EnumDescriptor(
   ],
   containing_type=None,
   serialized_options=None,
-  serialized_start=5185,
-  serialized_end=5223,
+  serialized_start=5262,
+  serialized_end=5300,
 )
 _sym_db.RegisterEnumDescriptor(_INFONOTE)
 
@@ -106,8 +106,8 @@ _RESPCODE = _descriptor.EnumDescriptor(
   ],
   containing_type=None,
   serialized_options=None,
-  serialized_start=5225,
-  serialized_end=5285,
+  serialized_start=5302,
+  serialized_end=5362,
 )
 _sym_db.RegisterEnumDescriptor(_RESPCODE)
 
@@ -133,8 +133,8 @@ _CRUD = _descriptor.EnumDescriptor(
   ],
   containing_type=None,
   serialized_options=None,
-  serialized_start=5287,
-  serialized_end=5329,
+  serialized_start=5364,
+  serialized_end=5406,
 )
 _sym_db.RegisterEnumDescriptor(_CRUD)
 
@@ -184,8 +184,8 @@ _CLIENTDEL_WHAT = _descriptor.EnumDescriptor(
   ],
   containing_type=None,
   serialized_options=None,
-  serialized_start=1747,
-  serialized_end=1802,
+  serialized_start=1824,
+  serialized_end=1879,
 )
 _sym_db.RegisterEnumDescriptor(_CLIENTDEL_WHAT)
 
@@ -246,8 +246,8 @@ _SERVERPRES_WHAT = _descriptor.EnumDescriptor(
   ],
   containing_type=None,
   serialized_options=None,
-  serialized_start=3588,
-  serialized_end=3705,
+  serialized_start=3665,
+  serialized_end=3782,
 )
 _sym_db.RegisterEnumDescriptor(_SERVERPRES_WHAT)
 
@@ -390,6 +390,43 @@ _SETSUB = _descriptor.Descriptor(
 )
 
 
+_CLIENTCRED_PARAMSENTRY = _descriptor.Descriptor(
+  name='ParamsEntry',
+  full_name='pbx.ClientCred.ParamsEntry',
+  filename=None,
+  file=DESCRIPTOR,
+  containing_type=None,
+  fields=[
+    _descriptor.FieldDescriptor(
+      name='key', full_name='pbx.ClientCred.ParamsEntry.key', index=0,
+      number=1, type=9, cpp_type=9, label=1,
+      has_default_value=False, default_value=_b("").decode('utf-8'),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+    _descriptor.FieldDescriptor(
+      name='value', full_name='pbx.ClientCred.ParamsEntry.value', index=1,
+      number=2, type=12, cpp_type=9, label=1,
+      has_default_value=False, default_value=_b(""),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+  ],
+  extensions=[
+  ],
+  nested_types=[],
+  enum_types=[
+  ],
+  serialized_options=_b('8\001'),
+  is_extendable=False,
+  syntax='proto3',
+  extension_ranges=[],
+  oneofs=[
+  ],
+  serialized_start=269,
+  serialized_end=314,
+)
+
 _CLIENTCRED = _descriptor.Descriptor(
   name='ClientCred',
   full_name='pbx.ClientCred',
@@ -420,15 +457,15 @@ _CLIENTCRED = _descriptor.Descriptor(
       serialized_options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
       name='params', full_name='pbx.ClientCred.params', index=3,
-      number=4, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b(""),
+      number=4, type=11, cpp_type=10, label=3,
+      has_default_value=False, default_value=[],
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       serialized_options=None, file=DESCRIPTOR),
   ],
   extensions=[
   ],
-  nested_types=[],
+  nested_types=[_CLIENTCRED_PARAMSENTRY, ],
   enum_types=[
   ],
   serialized_options=None,
@@ -437,8 +474,8 @@ _CLIENTCRED = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=160,
-  serialized_end=237,
+  serialized_start=161,
+  serialized_end=314,
 )
 
 
@@ -482,8 +519,8 @@ _SETDESC = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=239,
-  serialized_end=323,
+  serialized_start=316,
+  serialized_end=400,
 )
 
 
@@ -548,8 +585,8 @@ _GETOPTS = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=325,
-  serialized_end=442,
+  serialized_start=402,
+  serialized_end=519,
 )
 
 
@@ -600,8 +637,8 @@ _GETQUERY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=444,
-  serialized_end=551,
+  serialized_start=521,
+  serialized_end=628,
 )
 
 
@@ -652,8 +689,8 @@ _SETQUERY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=553,
-  serialized_end=662,
+  serialized_start=630,
+  serialized_end=739,
 )
 
 
@@ -690,8 +727,8 @@ _SEQRANGE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=664,
-  serialized_end=699,
+  serialized_start=741,
+  serialized_end=776,
 )
 
 
@@ -763,8 +800,8 @@ _CLIENTHI = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=701,
-  serialized_end=827,
+  serialized_start=778,
+  serialized_end=904,
 )
 
 
@@ -857,8 +894,8 @@ _CLIENTACC = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=830,
-  serialized_end=1020,
+  serialized_start=907,
+  serialized_end=1097,
 )
 
 
@@ -909,8 +946,8 @@ _CLIENTLOGIN = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1022,
-  serialized_end=1110,
+  serialized_start=1099,
+  serialized_end=1187,
 )
 
 
@@ -961,8 +998,8 @@ _CLIENTSUB = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1112,
-  serialized_end=1218,
+  serialized_start=1189,
+  serialized_end=1295,
 )
 
 
@@ -1006,8 +1043,8 @@ _CLIENTLEAVE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1220,
-  serialized_end=1275,
+  serialized_start=1297,
+  serialized_end=1352,
 )
 
 
@@ -1044,8 +1081,8 @@ _CLIENTPUB_HEADENTRY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1392,
-  serialized_end=1435,
+  serialized_start=1469,
+  serialized_end=1512,
 )
 
 _CLIENTPUB = _descriptor.Descriptor(
@@ -1102,8 +1139,8 @@ _CLIENTPUB = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1278,
-  serialized_end=1435,
+  serialized_start=1355,
+  serialized_end=1512,
 )
 
 
@@ -1147,8 +1184,8 @@ _CLIENTGET = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1437,
-  serialized_end=1505,
+  serialized_start=1514,
+  serialized_end=1582,
 )
 
 
@@ -1192,8 +1229,8 @@ _CLIENTSET = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1507,
-  serialized_end=1575,
+  serialized_start=1584,
+  serialized_end=1652,
 )
 
 
@@ -1266,8 +1303,8 @@ _CLIENTDEL = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1578,
-  serialized_end=1802,
+  serialized_start=1655,
+  serialized_end=1879,
 )
 
 
@@ -1311,8 +1348,8 @@ _CLIENTNOTE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1804,
-  serialized_end=1876,
+  serialized_start=1881,
+  serialized_end=1953,
 )
 
 
@@ -1422,8 +1459,8 @@ _CLIENTMSG = _descriptor.Descriptor(
       name='Message', full_name='pbx.ClientMsg.Message',
       index=0, containing_type=None, fields=[]),
   ],
-  serialized_start=1879,
-  serialized_end=2277,
+  serialized_start=1956,
+  serialized_end=2354,
 )
 
 
@@ -1467,8 +1504,8 @@ _SERVERCRED = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=2279,
-  serialized_end=2336,
+  serialized_start=2356,
+  serialized_end=2413,
 )
 
 
@@ -1582,8 +1619,8 @@ _TOPICDESC = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=2339,
-  serialized_end=2609,
+  serialized_start=2416,
+  serialized_end=2686,
 )
 
 
@@ -1711,8 +1748,8 @@ _TOPICSUB = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=2612,
-  serialized_end=2913,
+  serialized_start=2689,
+  serialized_end=2990,
 )
 
 
@@ -1749,8 +1786,8 @@ _DELVALUES = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=2915,
-  serialized_end=2974,
+  serialized_start=2992,
+  serialized_end=3051,
 )
 
 
@@ -1787,8 +1824,8 @@ _SERVERCTRL_PARAMSENTRY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3091,
-  serialized_end=3136,
+  serialized_start=269,
+  serialized_end=314,
 )
 
 _SERVERCTRL = _descriptor.Descriptor(
@@ -1845,8 +1882,8 @@ _SERVERCTRL = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=2977,
-  serialized_end=3136,
+  serialized_start=3054,
+  serialized_end=3213,
 )
 
 
@@ -1883,8 +1920,8 @@ _SERVERDATA_HEADENTRY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1392,
-  serialized_end=1435,
+  serialized_start=1469,
+  serialized_end=1512,
 )
 
 _SERVERDATA = _descriptor.Descriptor(
@@ -1955,8 +1992,8 @@ _SERVERDATA = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3139,
-  serialized_end=3346,
+  serialized_start=3216,
+  serialized_end=3423,
 )
 
 
@@ -2050,8 +2087,8 @@ _SERVERPRES = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3349,
-  serialized_end=3705,
+  serialized_start=3426,
+  serialized_end=3782,
 )
 
 
@@ -2123,8 +2160,8 @@ _SERVERMETA = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3708,
-  serialized_end=3879,
+  serialized_start=3785,
+  serialized_end=3956,
 )
 
 
@@ -2175,8 +2212,8 @@ _SERVERINFO = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3881,
-  serialized_end=3975,
+  serialized_start=3958,
+  serialized_end=4052,
 )
 
 
@@ -2244,8 +2281,8 @@ _SERVERMSG = _descriptor.Descriptor(
       name='Message', full_name='pbx.ServerMsg.Message',
       index=0, containing_type=None, fields=[]),
   ],
-  serialized_start=3978,
-  serialized_end=4180,
+  serialized_start=4055,
+  serialized_end=4257,
 )
 
 
@@ -2289,8 +2326,8 @@ _SERVERRESP = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4182,
-  serialized_end=4288,
+  serialized_start=4259,
+  serialized_end=4365,
 )
 
 
@@ -2362,8 +2399,8 @@ _SESSION = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4291,
-  serialized_end=4451,
+  serialized_start=4368,
+  serialized_end=4528,
 )
 
 
@@ -2400,8 +2437,8 @@ _CLIENTREQ = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4453,
-  serialized_end=4521,
+  serialized_start=4530,
+  serialized_end=4598,
 )
 
 
@@ -2438,8 +2475,8 @@ _SEARCHQUERY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4523,
-  serialized_end=4568,
+  serialized_start=4600,
+  serialized_end=4645,
 )
 
 
@@ -2483,8 +2520,8 @@ _SEARCHFOUND = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4570,
-  serialized_end=4660,
+  serialized_start=4647,
+  serialized_end=4737,
 )
 
 
@@ -2528,8 +2565,8 @@ _TOPICEVENT = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4662,
-  serialized_end=4745,
+  serialized_start=4739,
+  serialized_end=4822,
 )
 
 
@@ -2587,8 +2624,8 @@ _ACCOUNTEVENT = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4748,
-  serialized_end=4878,
+  serialized_start=4825,
+  serialized_end=4955,
 )
 
 
@@ -2667,8 +2704,8 @@ _SUBSCRIPTIONEVENT = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4881,
-  serialized_end=5057,
+  serialized_start=4958,
+  serialized_end=5134,
 )
 
 
@@ -2705,10 +2742,12 @@ _MESSAGEEVENT = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=5059,
-  serialized_end=5130,
+  serialized_start=5136,
+  serialized_end=5207,
 )
 
+_CLIENTCRED_PARAMSENTRY.containing_type = _CLIENTCRED
+_CLIENTCRED.fields_by_name['params'].message_type = _CLIENTCRED_PARAMSENTRY
 _SETDESC.fields_by_name['default_acs'].message_type = _DEFAULTACSMODE
 _GETQUERY.fields_by_name['desc'].message_type = _GETOPTS
 _GETQUERY.fields_by_name['sub'].message_type = _GETOPTS
@@ -2899,11 +2938,19 @@ SetSub = _reflection.GeneratedProtocolMessageType('SetSub', (_message.Message,),
 _sym_db.RegisterMessage(SetSub)
 
 ClientCred = _reflection.GeneratedProtocolMessageType('ClientCred', (_message.Message,), dict(
+
+  ParamsEntry = _reflection.GeneratedProtocolMessageType('ParamsEntry', (_message.Message,), dict(
+    DESCRIPTOR = _CLIENTCRED_PARAMSENTRY,
+    __module__ = 'model_pb2'
+    # @@protoc_insertion_point(class_scope:pbx.ClientCred.ParamsEntry)
+    ))
+  ,
   DESCRIPTOR = _CLIENTCRED,
   __module__ = 'model_pb2'
   # @@protoc_insertion_point(class_scope:pbx.ClientCred)
   ))
 _sym_db.RegisterMessage(ClientCred)
+_sym_db.RegisterMessage(ClientCred.ParamsEntry)
 
 SetDesc = _reflection.GeneratedProtocolMessageType('SetDesc', (_message.Message,), dict(
   DESCRIPTOR = _SETDESC,
@@ -3175,6 +3222,7 @@ MessageEvent = _reflection.GeneratedProtocolMessageType('MessageEvent', (_messag
 _sym_db.RegisterMessage(MessageEvent)
 
 
+_CLIENTCRED_PARAMSENTRY._options = None
 _CLIENTPUB_HEADENTRY._options = None
 _SERVERCTRL_PARAMSENTRY._options = None
 _SERVERDATA_HEADENTRY._options = None
@@ -3185,8 +3233,8 @@ _NODE = _descriptor.ServiceDescriptor(
   file=DESCRIPTOR,
   index=0,
   serialized_options=None,
-  serialized_start=5331,
-  serialized_end=5390,
+  serialized_start=5408,
+  serialized_end=5467,
   methods=[
   _descriptor.MethodDescriptor(
     name='MessageLoop',
@@ -3209,8 +3257,8 @@ _PLUGIN = _descriptor.ServiceDescriptor(
   file=DESCRIPTOR,
   index=1,
   serialized_options=None,
-  serialized_start=5393,
-  serialized_end=5680,
+  serialized_start=5470,
+  serialized_end=5757,
   methods=[
   _descriptor.MethodDescriptor(
     name='FireHose',
diff --git a/rest-auth/auth.py b/rest-auth/auth.py
index 6e51ad10..037b770f 100755
--- a/rest-auth/auth.py
+++ b/rest-auth/auth.py
@@ -106,8 +106,8 @@ def upd():
 
 @app.route('/rtagns', methods=['POST'])
 def rtags():
-    # Return dummy namespace "rest" and "email"
-    return jsonify({'strarr': ['rest', 'email']})
+    # Return dummy namespace "rest" and "email", let client check logins by regular expression.
+    return jsonify({'strarr': ['rest', 'email'], 'byteval': base64.b64encode('^[a-z0-9_]{3,8}$')})
 
 @app.errorhandler(404)
 def not_found(error):
diff --git a/server/auth/anon/auth_anon.go b/server/auth/anon/auth_anon.go
index ce64c76a..f533fa6e 100644
--- a/server/auth/anon/auth_anon.go
+++ b/server/auth/anon/auth_anon.go
@@ -39,6 +39,11 @@ func (authenticator) Authenticate(secret []byte) (*auth.Rec, []byte, error) {
 	return nil, nil, types.ErrUnsupported
 }
 
+// AsTag is not supported, will produce an empty string.
+func (authenticator) AsTag(token string) string {
+	return ""
+}
+
 // IsUnique for a noop. Anonymous login does not use secret, any secret is fine.
 func (authenticator) IsUnique(secret []byte) (bool, error) {
 	return true, nil
diff --git a/server/auth/auth.go b/server/auth/auth.go
index eadb083b..2d4f6ffe 100644
--- a/server/auth/auth.go
+++ b/server/auth/auth.go
@@ -223,6 +223,10 @@ type AuthHandler interface {
 	// Returns: user auth record, challenge, error.
 	Authenticate(secret []byte) (*Rec, []byte, error)
 
+	// AsTag converts search token into prefixed tag or an empty string if it
+	// cannot be represented as a prefixed tag.
+	AsTag(token string) string
+
 	// IsUnique verifies if the provided secret can be considered unique by the auth scheme
 	// E.g. if login is unique.
 	IsUnique(secret []byte) (bool, error)
diff --git a/server/auth/basic/auth_basic.go b/server/auth/basic/auth_basic.go
index 22b35e34..3b8d645c 100644
--- a/server/auth/basic/auth_basic.go
+++ b/server/auth/basic/auth_basic.go
@@ -239,11 +239,17 @@ func (a *authenticator) Authenticate(secret []byte) (*auth.Rec, []byte, error) {
 		State:     types.StateUndefined}, nil, nil
 }
 
-func (a *authenticator) PreCheck(secret []byte) (string, error) {
-	if err := a.checkLoginPolicy(uname); err != nil {
-		return "", err
+// AsTag convert search token into a prefixed tag, if possible.
+func (a *authenticator) AsTag(token string) string {
+	if !a.addToTags {
+		return ""
 	}
-	return a.name + ":" + uname
+
+	if err := a.checkLoginPolicy(token); err != nil {
+		return ""
+	}
+
+	return a.name + ":" + token
 }
 
 // IsUnique checks login uniqueness.
@@ -280,11 +286,11 @@ func (a *authenticator) DelRecords(uid types.Uid) error {
 
 // RestrictedTags returns tag namespaces (prefixes) restricted by this adapter.
 func (a *authenticator) RestrictedTags() ([]string, error) {
-	var tags []string
+	var prefix []string
 	if a.addToTags {
-		tags = []string{a.name}
+		prefix = []string{a.name}
 	}
-	return tags, nil
+	return prefix, nil
 }
 
 // GetResetParams returns authenticator parameters passed to password reset handler.
diff --git a/server/auth/rest/README.md b/server/auth/rest/README.md
index ba88a79a..f4e1a023 100644
--- a/server/auth/rest/README.md
+++ b/server/auth/rest/README.md
@@ -321,7 +321,9 @@ If accounts are managed by the server, the server should respond with an error `
 
 ### `rtagns` Get a list of restricted tag namespaces.
 
-Server may enforce certain tag namespaces to be restricted, i.e. not editable by the user.
+Server may enforce certain tag namespaces (tag prefixes) to be restricted, i.e. not editable by the user. 
+These are also used when searching for users. 
+The server may optionally provide a regular expression to validate search tokens before rewriting them as prefixed tags. I.e. if server allows only logins of 3-8 ASCII letters and numbers then the regexp could be `^[a-z0-9_]{3,8}$` which is base64-encoded as `XlthLXowLTlfXXszLDh9JA==`.
 
 #### Sample request
 ```json
@@ -333,6 +335,7 @@ Server may enforce certain tag namespaces to be restricted, i.e. not editable by
 #### Sample response
 ```json
 {
-  "strarr": ["basic", "email", "tel"]
+  "strarr": ["basic", "email", "tel"],
+  "byteval": "XlthLXowLTlfXXszLDh9JA=="
 }
 ```
diff --git a/server/auth/rest/auth_rest.go b/server/auth/rest/auth_rest.go
index 0071b34b..aaaaaf0b 100644
--- a/server/auth/rest/auth_rest.go
+++ b/server/auth/rest/auth_rest.go
@@ -6,8 +6,10 @@ import (
 	"encoding/json"
 	"errors"
 	"io/ioutil"
+	"log"
 	"net/http"
 	"net/url"
+	"regexp"
 	"strings"
 	"time"
 
@@ -26,6 +28,10 @@ type authenticator struct {
 	allowNewAccounts bool
 	// Use separate endpoints, i.e. add request name to serverUrl path when making requests.
 	useSeparateEndpoints bool
+	// Cache of restricted tag prefixes (namespaces).
+	rTagNS []string
+	// Optional regex pattern for checking tokens.
+	reToken *regexp.Regexp
 }
 
 // Request to the server.
@@ -202,6 +208,19 @@ func (a *authenticator) Authenticate(secret []byte) (*auth.Rec, []byte, error) {
 	return resp.Record, resp.ByteVal, nil
 }
 
+// AsTag converts search token into prefixed tag or an empty string if it
+// cannot be represented as a prefixed tag.
+func (a *authenticator) AsTag(token string) string {
+	if len(a.rTagNS) > 0 {
+		if a.reToken != nil && !a.reToken.MatchString(token) {
+			return ""
+		}
+		// No validation or passed validation.
+		return a.rTagNS[0] + ":" + token
+	}
+	return ""
+}
+
 // IsUnique verifies if the provided secret can be considered unique by the auth scheme
 // E.g. if login is unique.
 func (a *authenticator) IsUnique(secret []byte) (bool, error) {
@@ -231,11 +250,24 @@ func (a *authenticator) DelRecords(uid types.Uid) error {
 
 // RestrictedTags returns tag namespaces (prefixes, such as prefix:login) restricted by the server.
 func (a *authenticator) RestrictedTags() ([]string, error) {
+	if a.rTagNS != nil {
+		ns := make([]string, len(a.rTagNS))
+		copy(ns, a.rTagNS)
+		return ns, nil
+	}
 	resp, err := a.callEndpoint("rtagns", nil, nil)
 	if err != nil {
 		return nil, err
 	}
 
+	// Save valid result to cache.
+	a.rTagNS = resp.StrSliceVal
+	if len(resp.ByteVal) > 0 {
+		a.reToken, err = regexp.Compile(string(resp.ByteVal))
+		if err != nil {
+			log.Println("rest_auth: invalid token regexp", string(resp.ByteVal))
+		}
+	}
 	return resp.StrSliceVal, nil
 }
 
diff --git a/server/auth/token/auth_token.go b/server/auth/token/auth_token.go
index f3ca3ec0..af8aaad2 100644
--- a/server/auth/token/auth_token.go
+++ b/server/auth/token/auth_token.go
@@ -157,6 +157,11 @@ func (ta *authenticator) GenSecret(rec *auth.Rec) ([]byte, time.Time, error) {
 	return buf.Bytes(), expires, nil
 }
 
+// AsTag is not supported, will produce an empty string.
+func (authenticator) AsTag(token string) string {
+	return ""
+}
+
 // IsUnique is not supported, will produce an error.
 func (authenticator) IsUnique(token []byte) (bool, error) {
 	return false, types.ErrUnsupported
diff --git a/server/datamodel.go b/server/datamodel.go
index 6d668315..7e8d2790 100644
--- a/server/datamodel.go
+++ b/server/datamodel.go
@@ -73,7 +73,7 @@ type MsgCredClient struct {
 	// Verification response
 	Response string `json:"resp,omitempty"`
 	// Request parameters, such as preferences. Passed to valiator without interpretation.
-	Params interface{} `json:"params,omitempty"`
+	Params map[string]interface{} `json:"params,omitempty"`
 }
 
 // MsgSetQuery is an update to topic metadata: Desc, subscriptions, or tags.
diff --git a/server/pbconverter.go b/server/pbconverter.go
index 4acf6f7c..44be727d 100644
--- a/server/pbconverter.go
+++ b/server/pbconverter.go
@@ -921,7 +921,7 @@ func pbClientCredSerialize(in *MsgCredClient) *pbx.ClientCred {
 		Method:   in.Method,
 		Value:    in.Value,
 		Response: in.Response,
-		Params:   interfaceToBytes(in.Params)}
+		Params:   interfaceMapToByteMap(in.Params)}
 
 }
 
@@ -947,7 +947,7 @@ func pbClientCredDeserialize(in *pbx.ClientCred) *MsgCredClient {
 		Method:   in.GetMethod(),
 		Value:    in.GetValue(),
 		Response: in.GetResponse(),
-		Params:   bytesToInterface(in.GetParams())}
+		Params:   byteMapToInterfaceMap(in.GetParams())}
 }
 
 func pbClientCredsDeserialize(in []*pbx.ClientCred) []MsgCredClient {
diff --git a/server/user.go b/server/user.go
index 9ba0f3b9..cd69156f 100644
--- a/server/user.go
+++ b/server/user.go
@@ -76,7 +76,7 @@ func replyCreateUser(s *Session, msg *ClientComMessage, rec *auth.Rec) {
 	for i := range creds {
 		cr := &creds[i]
 		vld := store.GetValidator(cr.Method)
-		if err := vld.PreCheck(cr.Value, cr.Params); err != nil {
+		if _, err := vld.PreCheck(cr.Value, cr.Params); err != nil {
 			log.Println("create user: failed credential pre-check", cr, err, s.sid)
 			s.queueOut(decodeStoreError(err, msg.Id, "", msg.timestamp,
 				map[string]interface{}{"what": cr.Method}))
diff --git a/server/utils.go b/server/utils.go
index 9f57760c..ff9bcb9b 100644
--- a/server/utils.go
+++ b/server/utils.go
@@ -9,7 +9,6 @@ import (
 	"fmt"
 	"log"
 	"net"
-	"net/mail"
 	"path/filepath"
 	"reflect"
 	"regexp"
@@ -21,6 +20,7 @@ import (
 	"unicode/utf8"
 
 	"github.com/tinode/chat/server/auth"
+	"github.com/tinode/chat/server/store"
 	"github.com/tinode/chat/server/store/types"
 
 	"golang.org/x/crypto/acme/autocert"
@@ -35,10 +35,6 @@ var prefixedTagRegexp = regexp.MustCompile(`^([a-z]\w{1,15}):[-_+.!?#@\pL\pN]{1,
 // Generic tag: the same restrictions as tag body.
 var tagRegexp = regexp.MustCompile(`^[-_+.!?#@\pL\pN]{1,96}$`)
 
-// Token suitable as a login: 3-16 chars, starts with a Unicode letter (class L) and contains Unicode letters (L),
-// numbers (N) and underscore.
-var basicLoginName = regexp.MustCompile(`^\pL[_\pL\pN]{2,15}$`)
-
 const nullValue = "\u2421"
 
 // Convert a list of IDs into ranges
@@ -425,24 +421,26 @@ func rewriteTag(orig, countryCode string, withLogin bool) string {
 		return orig
 	}
 
-	// Is it email?
-	if addr, err := mail.ParseAddress(orig); err == nil {
-		if len([]rune(addr.Address)) < maxTagLength && addr.Address == orig {
-			return "email:" + orig
+	// Check if token can be rewritten by any of the validators
+	param := map[string]interface{}{"countryCode": countryCode}
+	for name, conf := range globals.validators {
+		if conf.addToTags {
+			val := store.GetValidator(name)
+			if tag, _ := val.PreCheck(orig, param); tag != "" {
+				return tag
+			}
 		}
-		log.Println("failed to rewrite email tag", orig)
-		return ""
 	}
 
-	if num, err := phonenumbers.Parse(orig, countryCode); err == nil {
-		// It's a phone number. Not checking the length because phone numbers cannot be that long.
-		return "tel:" + phonenumbers.Format(num, phonenumbers.E164)
-	}
-
-	// Does it look like a username/login?
-	// TODO: use configured authenticators to check if orig is a valid user name.
-	if withLogin && basicLoginName.MatchString(orig) {
-		return "basic:" + orig
+	// Try authenticators now.
+	if withLogin {
+		auths := store.GetAuthNames()
+		for _, name := range auths {
+			auth := store.GetAuthHandler(name)
+			if tag := auth.AsTag(orig); tag != "" {
+				return tag
+			}
+		}
 	}
 
 	if tagRegexp.MatchString(orig) {