diff --git a/sessionmanager/sessiondelegate.go b/sessionmanager/sessiondelegate.go
index 23466affe..2f10374f8 100644
--- a/sessionmanager/sessiondelegate.go
+++ b/sessionmanager/sessiondelegate.go
@@ -55,6 +55,7 @@ func (rsd *SessionDelegate) OnChannelPark(ev Event, sm SessionManager) {
 		Subject:     ev.GetSubject(),
 		Account:     ev.GetAccount(),
 		Destination: ev.GetDestination(),
+		Amount:      rsd.DebitPeriod.Seconds(),
 		TimeStart:   startTime}
 	var remainingSeconds float64
 	err = rsd.Connector.GetMaxSessionTime(cd, &remainingSeconds)
diff --git a/timespans/calldesc.go b/timespans/calldesc.go
index f4002d83c..fca26caa3 100644
--- a/timespans/calldesc.go
+++ b/timespans/calldesc.go
@@ -292,11 +292,13 @@ func (cd *CallDescriptor) GetMaxSessionTime() (seconds float64, err error) {
 	_, err = cd.LoadActivationPeriods()
 	now := time.Now()
 	availableCredit, availableSeconds := 0.0, 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
 		} else {
 			availableSeconds, availableCredit, _ = userBalance.getSecondsForPrefix(cd.Destination)
+			Logger.Debug(fmt.Sprintf("available sec: %v credit: %v", availableSeconds, availableCredit))
 		}
 	} else {
 		return cd.Amount, err
@@ -305,7 +307,6 @@ func (cd *CallDescriptor) GetMaxSessionTime() (seconds float64, err error) {
 	if availableCredit == 0 {
 		return availableSeconds, nil
 	}
-
 	// the price of a seccond cannot be determined because all the seconds can have a different cost.
 	// therfore we get the cost for the whole period and then if there are not enough money we backout in steps of 10%.
 	maxSessionSeconds := cd.Amount