diff --git a/engine/calldesc.go b/engine/calldesc.go
index 2d55812bb..9d6e81c1d 100644
--- a/engine/calldesc.go
+++ b/engine/calldesc.go
@@ -150,13 +150,14 @@ type CallDescriptor struct {
 	TOR                                   string            // used unit balances selector
 	ExtraFields                           map[string]string // Extra fields, mostly used for user profile matching
 	// session limits
-	MaxRate      float64
-	MaxRateUnit  time.Duration
-	MaxCostSoFar float64
-	CgrID        string
-	RunID        string
-	account      *Account
-	testCallcost *CallCost // testing purpose only!
+	MaxRate       float64
+	MaxRateUnit   time.Duration
+	MaxCostSoFar  float64
+	CgrID         string
+	RunID         string
+	ForceDuration bool // for Max debit if less than duration return err
+	account       *Account
+	testCallcost  *CallCost // testing purpose only!
 }
 
 func (cd *CallDescriptor) ValidateCallData() error {
@@ -728,9 +729,16 @@ func (cd *CallDescriptor) MaxDebit() (cc *CallCost, err error) {
 		return nil, utils.ErrAccountNotFound
 	} else {
 		//log.Printf("ACC: %+v", account)
-		if memberIds, err := account.GetUniqueSharedGroupMembers(cd); err == nil {
+		if memberIDs, err := account.GetUniqueSharedGroupMembers(cd); err == nil {
 			_, err = Guardian.Guard(func() (interface{}, error) {
 				remainingDuration, err := cd.getMaxSessionDuration(account)
+				if err != nil && cd.GetDuration() > 0 {
+					return 0, err
+				}
+				// check ForceDuartion
+				if cd.ForceDuration && !account.AllowNegative && remainingDuration < cd.GetDuration() {
+					return 0, utils.ErrInsufficientCredit
+				}
 				//log.Print("AFTER MAX SESSION: ", cd)
 				if err != nil || remainingDuration == 0 {
 					cc = cd.CreateCallCost()
@@ -758,7 +766,7 @@ func (cd *CallDescriptor) MaxDebit() (cc *CallCost, err error) {
 				cc, err = cd.debit(account, false, true)
 				//log.Print(balanceMap[0].Value, balanceMap[1].Value)
 				return 0, err
-			}, 0, memberIds.Slice()...)
+			}, 0, memberIDs.Slice()...)
 			if err != nil {
 				return cc, err
 			}
diff --git a/engine/calldesc_test.go b/engine/calldesc_test.go
index 9f174dc4f..8e1fe8ac0 100644
--- a/engine/calldesc_test.go
+++ b/engine/calldesc_test.go
@@ -1271,6 +1271,31 @@ func TestMaxDebitZeroDefinedRate(t *testing.T) {
 	}
 }
 
+func TestMaxDebitForceDuration(t *testing.T) {
+	ap, _ := ratingStorage.GetActionPlan("TOPUP10_AT", false)
+	for _, at := range ap.ActionTimings {
+		at.accountIDs = ap.AccountIDs
+		at.Execute()
+	}
+	cd1 := &CallDescriptor{
+		Direction:     "*out",
+		Category:      "call",
+		Tenant:        "cgrates.org",
+		Subject:       "12345",
+		Account:       "12345",
+		Destination:   "447956",
+		TimeStart:     time.Date(2014, 3, 4, 6, 0, 0, 0, time.UTC),
+		TimeEnd:       time.Date(2014, 3, 4, 6, 1, 40, 0, time.UTC),
+		LoopIndex:     0,
+		DurationIndex: 0,
+		ForceDuration: true,
+	}
+	_, err := cd1.MaxDebit()
+	if err != utils.ErrInsufficientCredit {
+		t.Fatal("Error forcing duration: ", err)
+	}
+}
+
 func TestMaxDebitZeroDefinedRateOnlyMinutes(t *testing.T) {
 	ap, _ := ratingStorage.GetActionPlan("TOPUP10_AT", false)
 	for _, at := range ap.ActionTimings {
diff --git a/utils/consts.go b/utils/consts.go
index 42ce00d04..904c177a4 100644
--- a/utils/consts.go
+++ b/utils/consts.go
@@ -29,7 +29,7 @@ var (
 	ErrRatingPlanNotFound      = errors.New("RATING_PLAN_NOT_FOUND")
 	ErrAccountNotFound         = errors.New("ACCOUNT_NOT_FOUND")
 	ErrUserNotFound            = errors.New("USER_NOT_FOUND")
-	ErrCreditInsufficient      = errors.New("CREDIT_INSUFFICIENT")
+	ErrInsufficientCredit      = errors.New("INSUFFICENT_CREDIT")
 )
 
 const (