diff --git a/internal/context/gsm_build.go b/internal/context/gsm_build.go
index 44e9396..fb56534 100644
--- a/internal/context/gsm_build.go
+++ b/internal/context/gsm_build.go
@@ -38,7 +38,7 @@ func BuildGSMPDUSessionEstablishmentAccept(smContext *SMContext) ([]byte, error)
 
 	qoSRules := nasType.QoSRules{
 		{
-			Identifier: 0x01,
+			Identifier: smContext.defRuleID,
 			DQR:        true,
 			Operation:  nasType.OperationCodeCreateNewQoSRule,
 			Precedence: 255,
diff --git a/internal/context/sm_context.go b/internal/context/sm_context.go
index c97c8f1..9a115d7 100644
--- a/internal/context/sm_context.go
+++ b/internal/context/sm_context.go
@@ -182,6 +182,7 @@ type SMContext struct {
 	SelectedSessionRuleID string
 
 	// QoS
+	defRuleID               uint8
 	QoSRuleIDGenerator      *idgenerator.IDGenerator
 	PacketFilterIDGenerator *idgenerator.IDGenerator
 	QFIGenerator            *idgenerator.IDGenerator
@@ -299,6 +300,12 @@ func NewSMContext(id string, pduSessID int32) *SMContext {
 	smContext.Tunnel = NewUPTunnel()
 
 	smContext.QoSRuleIDGenerator = idgenerator.NewGenerator(1, 255)
+	if defRuleID, err := smContext.QoSRuleIDGenerator.Allocate(); err != nil {
+		logger.CtxLog.Warnln("Create Default QoS rule error ", err)
+	} else {
+		smContext.defRuleID = uint8(defRuleID)
+	}
+
 	smContext.PacketFilterIDGenerator = idgenerator.NewGenerator(1, 255)
 	smContext.QFIGenerator = idgenerator.NewGenerator(2, 63) // 1 always reserve for default Qos
 	smContext.PCCRuleIDToQoSRuleID = make(map[string]uint8)