diff --git a/context/gsm_build.go b/context/gsm_build.go
index 483a18ec..dba60bb1 100644
--- a/context/gsm_build.go
+++ b/context/gsm_build.go
@@ -163,7 +163,7 @@ func BuildGSMPDUSessionEstablishmentReject(smContext *SMContext, cause uint8) ([
 	return m.PlainNasEncode()
 }
 
-func BuildGSMPDUSessionReleaseCommand(smContext *SMContext) ([]byte, error) {
+func BuildGSMPDUSessionReleaseCommand(smContext *SMContext, cause uint8) ([]byte, error) {
 	m := nas.NewMessage()
 	m.GsmMessage = nas.NewGsmMessage()
 	m.GsmHeader.SetMessageType(nas.MsgTypePDUSessionReleaseCommand)
@@ -175,7 +175,7 @@ func BuildGSMPDUSessionReleaseCommand(smContext *SMContext) ([]byte, error) {
 	pDUSessionReleaseCommand.SetExtendedProtocolDiscriminator(nasMessage.Epd5GSSessionManagementMessage)
 	pDUSessionReleaseCommand.SetPDUSessionID(uint8(smContext.PDUSessionID))
 	pDUSessionReleaseCommand.SetPTI(smContext.Pti)
-	pDUSessionReleaseCommand.SetCauseValue(0x0)
+	pDUSessionReleaseCommand.SetCauseValue(cause)
 
 	return m.PlainNasEncode()
 }
diff --git a/producer/pdu_session.go b/producer/pdu_session.go
index 54a257f5..f00d516e 100644
--- a/producer/pdu_session.go
+++ b/producer/pdu_session.go
@@ -322,7 +322,12 @@ func HandlePDUSessionSMContextUpdate(smContextRef string, body models.UpdateSmCo
 				}
 			}
 
-			if buf, err := smf_context.BuildGSMPDUSessionReleaseCommand(smContext); err != nil {
+			cause := nasMessage.Cause5GSMRegularDeactivation
+			if m.PDUSessionReleaseRequest.Cause5GSM != nil {
+				cause = m.PDUSessionReleaseRequest.Cause5GSM.GetCauseValue()
+			}
+
+			if buf, err := smf_context.BuildGSMPDUSessionReleaseCommand(smContext, cause); err != nil {
 				logger.PduSessLog.Errorf("Build GSM PDUSessionReleaseCommand failed: %+v", err)
 			} else {
 				response.BinaryDataN1SmMessage = buf