diff --git a/config/n3ue.yaml b/config/n3ue.yaml
index 2abe8ca..26f2780 100644
--- a/config/n3ue.yaml
+++ b/config/n3ue.yaml
@@ -6,6 +6,9 @@ configuration:
         IPSecIfaceAddr: 10.0.1.1 # IP address of Nwu interface (IKE) on N3IWF
         IPsecInnerAddr: 10.0.0.1 # IP address of IPsec tunnel enpoint on N3IWF
     N3UEInformation:
+        VisitedPLMN: # Optional
+            MCC: 208 # Mobile Country Code (3 digits string, digit: 0~9)
+            MNC: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)  
         IMSI:
             PLMNID: # Public Land Mobile Network ID
                 MCC: 208 # Mobile Country Code (3 digits string, digit: 0~9)
diff --git a/internal/nwucp/handler/send.go b/internal/nwucp/handler/send.go
index 09064e4..da23e7a 100644
--- a/internal/nwucp/handler/send.go
+++ b/internal/nwucp/handler/send.go
@@ -65,11 +65,13 @@ func SendPduSessionEstablishmentRequest(ue *security.RanUeContext,
 
 func SendDeregistration() {
 	n3ueContext := context.N3UESelf()
-	mobileIdentity5GS := nasType.MobileIdentity5GS{
-		Len:    n3ueContext.GUTI.Len,
-		Buffer: n3ueContext.GUTI.Octet[:],
-	}
-	deregistrationRequest := nasPacket.GetDeregistrationRequest(0x02, 0x01, 0x00, mobileIdentity5GS)
+	if n3ueContext.GUTI != nil {
+		mobileIdentity5GS := nasType.MobileIdentity5GS{
+			Len:    n3ueContext.GUTI.Len,
+			Buffer: n3ueContext.GUTI.Octet[:],
+		}
+		deregistrationRequest := nasPacket.GetDeregistrationRequest(0x02, 0x01, 0x00, mobileIdentity5GS)
 
-	SendNasMsg(n3ueContext.RanUeContext, n3ueContext.N3IWFRanUe.TCPConnection, deregistrationRequest)
+		SendNasMsg(n3ueContext.RanUeContext, n3ueContext.N3IWFRanUe.TCPConnection, deregistrationRequest)
+	}
 }
diff --git a/pkg/factory/config.go b/pkg/factory/config.go
index 6ac6362..564cb77 100644
--- a/pkg/factory/config.go
+++ b/pkg/factory/config.go
@@ -131,6 +131,7 @@ type N3UEInfo struct {
 	IPSecSaCpSPI   uint32       `yaml:"IPSecSA3gppControlPlaneSPI" valid:"hexadecimal,required"`
 	SmPolicy       []PolicyItem `yaml:"SmPolicy" valid:"required"`
 	Security       Security     `yaml:"Security" valid:"required"`
+	VisitedPlmn    *PLMN        `yaml:"VisitedPLMN" valid:"optional"`
 }
 
 func (i *N3UEInfo) validate() (bool, error) {
@@ -200,6 +201,10 @@ func (n *N3UEInfo) GetAMFID() ([]byte, error) {
 func (n *N3UEInfo) GetSNN() string {
 	mcc := n.IMSI.PLMN.MCC
 	mnc := n.IMSI.PLMN.MNC
+	if n.VisitedPlmn != nil {
+		mcc = n.VisitedPlmn.MCC
+		mnc = n.VisitedPlmn.MNC
+	}
 	if len(n.IMSI.PLMN.MNC) == 2 {
 		mnc = "0" + mnc
 	}