diff --git a/engine/calldesc.go b/engine/calldesc.go
index 187435743..c1b6c9c6f 100644
--- a/engine/calldesc.go
+++ b/engine/calldesc.go
@@ -415,6 +415,7 @@ func (cd *CallDescriptor) GetMaxSessionDuration() (time.Duration, error) {
 	if cd.CallDuration == 0 {
 		cd.CallDuration = cd.TimeEnd.Sub(cd.TimeStart)
 	}
+	Logger.Debug(fmt.Sprintf("MAX SESSION cd: %+v", cd))
 	err := cd.LoadRatingPlans()
 	if err != nil {
 		Logger.Err(fmt.Sprintf("error getting cost for key %v: %v", cd.GetUserBalanceKey(), err))
@@ -422,7 +423,6 @@ func (cd *CallDescriptor) GetMaxSessionDuration() (time.Duration, error) {
 	}
 	var availableDuration time.Duration
 	availableCredit := 0.0
-	// Logger.Debug(fmt.Sprintf("cd: %+v", cd))
 	if userBalance, err := cd.getUserBalance(); err == nil && userBalance != nil {
 		if userBalance.Type == UB_TYPE_POSTPAID {
 			return -1, nil
@@ -434,6 +434,7 @@ func (cd *CallDescriptor) GetMaxSessionDuration() (time.Duration, error) {
 		Logger.Err(fmt.Sprintf("Could not get user balance for %s: %s.", cd.GetUserBalanceKey(), err.Error()))
 		return 0, err
 	}
+	Logger.Debug(fmt.Sprintf("availableDuration: %v, availableCredit: %v", availableDuration, availableCredit))
 	// check for zero balance
 	if availableCredit == 0 {
 		return availableDuration, nil
@@ -443,7 +444,7 @@ func (cd *CallDescriptor) GetMaxSessionDuration() (time.Duration, error) {
 		// there are enough minutes for requested interval
 		return initialDuration, nil
 	}
-
+	Logger.Debug(fmt.Sprintf("initial Duration: %v", initialDuration))
 	// we must move the timestart for the interval with the available duration because
 	// that was already checked
 	cd.TimeStart = cd.TimeStart.Add(availableDuration)
@@ -455,6 +456,7 @@ func (cd *CallDescriptor) GetMaxSessionDuration() (time.Duration, error) {
 	// now let's check how many increments are covered with the avilableCredit
 	for _, ts := range cc.Timespans {
 		ts.createIncrementsSlice()
+		Logger.Debug(fmt.Sprintf("TS: %+v", ts))
 		for _, incr := range ts.Increments {
 			if incr.Cost <= availableCredit {
 				availableCredit -= incr.Cost