diff --git a/common/net/address.go b/common/net/address.go
index d3eb9b85..e36ab6a7 100644
--- a/common/net/address.go
+++ b/common/net/address.go
@@ -19,6 +19,14 @@ type Address interface {
 	String() string // String representation of this Address
 }
 
+func ParseAddress(addr string) Address {
+	ip := net.ParseIP(addr)
+	if ip != nil {
+		return IPAddress(ip)
+	}
+	return DomainAddress(addr)
+}
+
 func allZeros(data []byte) bool {
 	for _, v := range data {
 		if v != 0 {
diff --git a/common/net/address_json.go b/common/net/address_json.go
index 60ba8e21..2434e059 100644
--- a/common/net/address_json.go
+++ b/common/net/address_json.go
@@ -16,11 +16,6 @@ func (this *AddressJson) UnmarshalJSON(data []byte) error {
 	if err := json.Unmarshal(data, &rawStr); err != nil {
 		return err
 	}
-	ip := net.ParseIP(rawStr)
-	if ip != nil {
-		this.Address = IPAddress(ip)
-	} else {
-		this.Address = DomainAddress(rawStr)
-	}
+	this.Address = ParseAddress(rawStr)
 	return nil
 }
diff --git a/common/net/port.go b/common/net/port.go
index e22d58df..fc791e02 100644
--- a/common/net/port.go
+++ b/common/net/port.go
@@ -7,7 +7,7 @@ import (
 type Port serial.Uint16Literal
 
 func PortFromBytes(port []byte) Port {
-	return Port(uint16(port[0])<<8 + uint16(port[1]))
+	return Port(serial.ParseUint16(port))
 }
 
 func (this Port) Value() uint16 {
@@ -15,7 +15,7 @@ func (this Port) Value() uint16 {
 }
 
 func (this Port) Bytes() []byte {
-	return []byte{byte(this >> 8), byte(this)}
+	return serial.Uint16Literal(this).Bytes()
 }
 
 func (this Port) String() string {
diff --git a/common/serial/numbers.go b/common/serial/numbers.go
index fd62914e..235dab18 100644
--- a/common/serial/numbers.go
+++ b/common/serial/numbers.go
@@ -10,6 +10,17 @@ type Uint16 interface {
 
 type Uint16Literal uint16
 
+func ParseUint16(data []byte) Uint16Literal {
+	switch len(data) {
+	case 0:
+		return Uint16Literal(0)
+	case 1:
+		return Uint16Literal(uint16(data[0]))
+	default:
+		return Uint16Literal(uint16(data[0])<<8 + uint16(data[1]))
+	}
+}
+
 func (this Uint16Literal) String() string {
 	return strconv.Itoa(int(this))
 }
@@ -18,6 +29,10 @@ func (this Uint16Literal) Value() uint16 {
 	return uint16(this)
 }
 
+func (this Uint16Literal) Bytes() []byte {
+	return []byte{byte(this >> 8), byte(this)}
+}
+
 type Int interface {
 	Value() int
 }
diff --git a/proxy/vmess/command/accounts.go b/proxy/vmess/command/accounts.go
index 99af276c..29a94375 100644
--- a/proxy/vmess/command/accounts.go
+++ b/proxy/vmess/command/accounts.go
@@ -4,6 +4,7 @@ import (
 	"io"
 	"time"
 
+	v2net "github.com/v2ray/v2ray-core/common/net"
 	"github.com/v2ray/v2ray-core/common/serial"
 	"github.com/v2ray/v2ray-core/common/uuid"
 	"github.com/v2ray/v2ray-core/transport"
@@ -13,28 +14,79 @@ func init() {
 	RegisterResponseCommand(1, func() Command { return new(SwitchAccount) })
 }
 
-// Size: 16 + 8 = 24
+// Structure
+// 1 byte: host len N
+// N bytes: host
+// 2 bytes: port
+// 16 bytes: uuid
+// 2 bytes: alterid
+// 8 bytes: time
 type SwitchAccount struct {
+	Host       v2net.Address
+	Port       v2net.Port
 	ID         *uuid.UUID
+	AlterIds   serial.Uint16Literal
 	ValidUntil time.Time
 }
 
 func (this *SwitchAccount) Marshal(writer io.Writer) (int, error) {
+	outBytes := 0
+	hostStr := ""
+	if this.Host != nil {
+		hostStr = this.Host.String()
+	}
+	writer.Write([]byte{byte(len(hostStr))})
+	outBytes++
+
+	if len(hostStr) > 0 {
+		writer.Write([]byte(hostStr))
+		outBytes += len(hostStr)
+	}
+
+	writer.Write(this.Port.Bytes())
+	outBytes += 2
+
 	idBytes := this.ID.Bytes()
+	writer.Write(idBytes)
+	outBytes += len(idBytes)
+
+	writer.Write(this.AlterIds.Bytes())
+	outBytes += 2
+
 	timestamp := this.ValidUntil.Unix()
 	timeBytes := serial.Int64Literal(timestamp).Bytes()
 
-	writer.Write(idBytes)
 	writer.Write(timeBytes)
+	outBytes += len(timeBytes)
 
-	return 24, nil
+	return outBytes, nil
 }
 
 func (this *SwitchAccount) Unmarshal(data []byte) error {
-	if len(data) != 24 {
+	lenHost := int(data[0])
+	if len(data) < lenHost+1 {
 		return transport.CorruptedPacket
 	}
-	this.ID, _ = uuid.ParseBytes(data[0:16])
-	this.ValidUntil = time.Unix(serial.BytesLiteral(data[16:24]).Int64Value(), 0)
+	this.Host = v2net.ParseAddress(string(data[1 : 1+lenHost]))
+	portStart := 1 + lenHost
+	if len(data) < portStart+2 {
+		return transport.CorruptedPacket
+	}
+	this.Port = v2net.PortFromBytes(data[portStart : portStart+2])
+	idStart := portStart + 2
+	if len(data) < idStart+16 {
+		return transport.CorruptedPacket
+	}
+	this.ID, _ = uuid.ParseBytes(data[idStart : idStart+16])
+	alterIdStart := idStart + 16
+	if len(data) < alterIdStart+2 {
+		return transport.CorruptedPacket
+	}
+	this.AlterIds = serial.ParseUint16(data[alterIdStart : alterIdStart+2])
+	timeStart := alterIdStart + 2
+	if len(data) < timeStart+8 {
+		return transport.CorruptedPacket
+	}
+	this.ValidUntil = time.Unix(serial.BytesLiteral(data[timeStart:timeStart+8]).Int64Value(), 0)
 	return nil
 }
diff --git a/proxy/vmess/command/accounts_test.go b/proxy/vmess/command/accounts_test.go
index 9aee1a04..a699e5f9 100644
--- a/proxy/vmess/command/accounts_test.go
+++ b/proxy/vmess/command/accounts_test.go
@@ -5,6 +5,7 @@ import (
 	"testing"
 	"time"
 
+	netassert "github.com/v2ray/v2ray-core/common/net/testing/assert"
 	"github.com/v2ray/v2ray-core/common/uuid"
 	. "github.com/v2ray/v2ray-core/proxy/vmess/command"
 	v2testing "github.com/v2ray/v2ray-core/testing"
@@ -15,7 +16,9 @@ func TestSwitchAccount(t *testing.T) {
 	v2testing.Current(t)
 
 	sa := &SwitchAccount{
+		Port:       1234,
 		ID:         uuid.New(),
+		AlterIds:   1024,
 		ValidUntil: time.Now(),
 	}
 
@@ -30,6 +33,8 @@ func TestSwitchAccount(t *testing.T) {
 	cmd.Unmarshal(buffer.Bytes())
 	sa2, ok := cmd.(*SwitchAccount)
 	assert.Bool(ok).IsTrue()
+	netassert.Port(sa.Port).Equals(sa2.Port)
 	assert.String(sa.ID).Equals(sa2.ID.String())
+	assert.Uint16(sa.AlterIds.Value()).Equals(sa2.AlterIds.Value())
 	assert.Int64(sa.ValidUntil.Unix()).Equals(sa2.ValidUntil.Unix())
 }
diff --git a/proxy/vmess/inbound/config.go b/proxy/vmess/inbound/config.go
index 1d085f95..dcdbccea 100644
--- a/proxy/vmess/inbound/config.go
+++ b/proxy/vmess/inbound/config.go
@@ -4,6 +4,15 @@ import (
 	"github.com/v2ray/v2ray-core/proxy/vmess"
 )
 
+type DetourConfig struct {
+	ToTag string
+}
+
+type FeaturesConfig struct {
+	Detour *DetourConfig
+}
+
 type Config struct {
 	AllowedUsers []*vmess.User
+	Features     *FeaturesConfig
 }
diff --git a/proxy/vmess/inbound/config_json.go b/proxy/vmess/inbound/config_json.go
index e62ab1a5..dfcc52bb 100644
--- a/proxy/vmess/inbound/config_json.go
+++ b/proxy/vmess/inbound/config_json.go
@@ -9,18 +9,49 @@ import (
 	"github.com/v2ray/v2ray-core/proxy/vmess"
 )
 
+func (this *DetourConfig) UnmarshalJSON(data []byte) error {
+	type JsonDetourConfig struct {
+		ToTag string `json:"to"`
+	}
+	jsonConfig := new(JsonDetourConfig)
+	if err := json.Unmarshal(data, jsonConfig); err != nil {
+		return err
+	}
+	this.ToTag = jsonConfig.ToTag
+	return nil
+}
+
+func (this *FeaturesConfig) UnmarshalJSON(data []byte) error {
+	type JsonFeaturesConfig struct {
+		Detour *DetourConfig `json:"detour"`
+	}
+	jsonConfig := new(JsonFeaturesConfig)
+	if err := json.Unmarshal(data, jsonConfig); err != nil {
+		return err
+	}
+	this.Detour = jsonConfig.Detour
+	return nil
+}
+
+func (this *Config) UnmarshalJSON(data []byte) error {
+	type JsonConfig struct {
+		Users    []*vmess.User   `json:"clients"`
+		Features *FeaturesConfig `json:"features"`
+	}
+	jsonConfig := new(JsonConfig)
+	if err := json.Unmarshal(data, jsonConfig); err != nil {
+		return err
+	}
+	this.AllowedUsers = jsonConfig.Users
+	this.Features = jsonConfig.Features
+	return nil
+}
+
 func init() {
 	config.RegisterInboundConnectionConfig("vmess",
 		func(data []byte) (interface{}, error) {
-			type JsonConfig struct {
-				Users []*vmess.User `json:"clients"`
-			}
-			jsonConfig := new(JsonConfig)
-			if err := json.Unmarshal(data, jsonConfig); err != nil {
-				return nil, err
-			}
-			return &Config{
-				AllowedUsers: jsonConfig.Users,
-			}, nil
+			config := new(Config)
+			err := json.Unmarshal(data, config)
+			return config, err
 		})
 }
diff --git a/proxy/vmess/user_json.go b/proxy/vmess/user_json.go
index 3d538225..23038332 100644
--- a/proxy/vmess/user_json.go
+++ b/proxy/vmess/user_json.go
@@ -13,7 +13,7 @@ func (u *User) UnmarshalJSON(data []byte) error {
 		IdString     string `json:"id"`
 		EmailString  string `json:"email"`
 		LevelInt     int    `json:"level"`
-		AlterIdCount int    `json:"alterId"`
+		AlterIdCount uint16 `json:"alterId"`
 	}
 	var rawUserValue rawUser
 	if err := json.Unmarshal(data, &rawUserValue); err != nil {