diff --git a/engine/cdrs.go b/engine/cdrs.go
index 556b9e84c..832c0d425 100644
--- a/engine/cdrs.go
+++ b/engine/cdrs.go
@@ -798,7 +798,7 @@ func (cdrS *CDRServer) V2StoreSessionCost(args *ArgsV2CDRSStoreSMCost, reply *st
 			nil, true, utils.NonTransactional)
 	}
 	// end of RPC caching
-	cc := args.Cost.CostDetails.AsCallCost()
+	cc := args.Cost.CostDetails.AsCallCost(utils.EmptyString)
 	cc.Round()
 	roundIncrements := cc.GetRoundIncrements()
 	if len(roundIncrements) != 0 {
diff --git a/engine/eventcost.go b/engine/eventcost.go
index ebbd35bbb..c2b4fe873 100644
--- a/engine/eventcost.go
+++ b/engine/eventcost.go
@@ -323,14 +323,17 @@ func (ec *EventCost) AsRefundIncrements(tor string) (cd *CallDescriptor) {
 }
 
 // AsCallCost converts an EventCost into a CallCost
-func (ec *EventCost) AsCallCost() *CallCost {
+func (ec *EventCost) AsCallCost(tor string) *CallCost {
 	cc := &CallCost{
-		Cost: ec.GetCost(), RatedUsage: float64(ec.GetUsage().Nanoseconds()),
+		TOR:            utils.FirstNonEmpty(tor, utils.VOICE),
+		Cost:           ec.GetCost(),
+		RatedUsage:     float64(ec.GetUsage().Nanoseconds()),
 		AccountSummary: ec.AccountSummary}
 	cc.Timespans = make(TimeSpans, len(ec.Charges))
 	for i, cIl := range ec.Charges {
 		ts := &TimeSpan{Cost: cIl.Cost(),
-			DurationIndex: *cIl.Usage(), CompressFactor: cIl.CompressFactor}
+			DurationIndex:  *cIl.Usage(),
+			CompressFactor: cIl.CompressFactor}
 		if cIl.ecUsageIdx == nil { // index was not populated yet
 			ec.ComputeEventCostUsageIndexes()
 		}
diff --git a/engine/eventcost_test.go b/engine/eventcost_test.go
index c6f8fec6a..1b0674de8 100644
--- a/engine/eventcost_test.go
+++ b/engine/eventcost_test.go
@@ -1076,6 +1076,7 @@ func TestECAsCallCost(t *testing.T) {
 		},
 	}
 	eCC := &CallCost{
+		TOR:            utils.VOICE,
 		Cost:           0.85,
 		RatedUsage:     120000000000,
 		AccountSummary: acntSummary,
@@ -1214,7 +1215,7 @@ func TestECAsCallCost(t *testing.T) {
 			},
 		},
 	}
-	cc := ec.AsCallCost()
+	cc := ec.AsCallCost(utils.EmptyString)
 	if !reflect.DeepEqual(eCC, cc) {
 		t.Errorf("Expecting: %+v, received: %+v", utils.ToJSON(eCC), utils.ToJSON(cc))
 	}
diff --git a/general_tests/sessions_concur_test.go b/general_tests/sessions_concur_test.go
index de8a13da9..09118b3e8 100644
--- a/general_tests/sessions_concur_test.go
+++ b/general_tests/sessions_concur_test.go
@@ -149,29 +149,38 @@ func runSession(acntID string) (err error) {
 	originID := utils.GenUUID() // each test with it's own OriginID
 
 	// topup as much as we know we need for one session
-	topupDur := time.Duration(90) * time.Hour
+	mainTopup := time.Duration(90) * time.Second
 	var addBlcRply string
 	argsAddBalance := &v1.AttrAddBalance{
 		Tenant:      "cgrates.org",
 		Account:     acntID,
 		BalanceType: utils.VOICE,
-		Value:       float64(topupDur.Nanoseconds())}
+		Value:       float64(mainTopup.Nanoseconds()),
+		Balance: map[string]interface{}{
+			utils.ID:     "MAIN",
+			utils.Weight: 10,
+		},
+	}
+	if err = sCncrRPC.Call(utils.ApierV1AddBalance, argsAddBalance, &addBlcRply); err != nil {
+		return
+	} else if addBlcRply != utils.OK {
+		return fmt.Errorf("received: <%s> to ApierV1.AddBalance", addBlcRply)
+	}
+	bufferTopup := time.Duration(8760) * time.Hour
+	argsAddBalance = &v1.AttrAddBalance{
+		Tenant:      "cgrates.org",
+		Account:     acntID,
+		BalanceType: utils.VOICE,
+		Value:       float64(bufferTopup.Nanoseconds()),
+		Balance: map[string]interface{}{
+			utils.ID: "BUFFER",
+		},
+	}
 	if err = sCncrRPC.Call(utils.ApierV1AddBalance, argsAddBalance, &addBlcRply); err != nil {
 		return
 	} else if addBlcRply != utils.OK {
 		return fmt.Errorf("received: <%s> to ApierV1.AddBalance", addBlcRply)
 	}
-	/*
-		var acnt *engine.Account
-		acntAttrs := &utils.AttrGetAccount{
-			Tenant:  "cgrates.org",
-			Account: acntID}
-		if err = sCncrRPC.Call(utils.ApierV2GetAccount, acntAttrs, &acnt); err != nil {
-			return
-		} else if vcBlnc := acnt.BalanceMap[utils.VOICE].GetTotalValue(); vcBlnc != float64(topupDur.Nanoseconds()) {
-			return fmt.Errorf("unexpected voice balance received: %+v", utils.ToIJSON(acnt))
-		}
-	*/
 	time.Sleep(time.Duration(
 		utils.RandomInteger(0, 100)) * time.Millisecond) // randomize between tests
 
@@ -291,19 +300,19 @@ func runSession(acntID string) (err error) {
 	}
 	time.Sleep(time.Duration(
 		utils.RandomInteger(0, 100)) * time.Millisecond)
-	/*
-		// make sure the account was properly refunded
-		var acnt *engine.Account
-		acntAttrs := &utils.AttrGetAccount{
-			Tenant:  "cgrates.org",
-			Account: acntID}
-		if err = sCncrRPC.Call(utils.ApierV2GetAccount, acntAttrs, &acnt); err != nil {
-			return
-		} else if vcBlnc := acnt.BalanceMap[utils.VOICE].GetTotalValue(); vcBlnc != 0 {
-			return fmt.Errorf("unexpected voice balance received: %+v", utils.ToIJSON(acnt))
-		} else if mnBlnc := acnt.BalanceMap[utils.MONETARY].GetTotalValue(); mnBlnc != 0 {
-			return fmt.Errorf("unexpected voice balance received: %+v", utils.ToIJSON(acnt))
-		}
-	*/
+
+	// make sure the account was properly refunded
+	var acnt *engine.Account
+	acntAttrs := &utils.AttrGetAccount{
+		Tenant:  "cgrates.org",
+		Account: acntID}
+	if err = sCncrRPC.Call(utils.ApierV2GetAccount, acntAttrs, &acnt); err != nil {
+		return
+	} else if vcBlnc := acnt.BalanceMap[utils.VOICE].GetTotalValue(); float64(bufferTopup.Nanoseconds())-vcBlnc > 100.0 { // eliminate rounding errors
+		return fmt.Errorf("unexpected voice balance received: %+v", utils.ToIJSON(acnt))
+	} else if mnBlnc := acnt.BalanceMap[utils.MONETARY].GetTotalValue(); mnBlnc != 0 {
+		return fmt.Errorf("unexpected voice balance received: %+v", utils.ToIJSON(acnt))
+	}
+
 	return
 }
diff --git a/sessions/sessions.go b/sessions/sessions.go
index 05af43e54..a4ddd5b12 100644
--- a/sessions/sessions.go
+++ b/sessions/sessions.go
@@ -562,7 +562,7 @@ func (sS *SessionS) refundSession(s *Session, sRunIdx int, rUsage time.Duration)
 	} else if srplsEC == nil {
 		return
 	}
-	sCC := srplsEC.AsCallCost()
+	sCC := srplsEC.AsCallCost(sr.CD.TOR)
 	var incrmts engine.Increments
 	for _, tmspn := range sCC.Timespans {
 		for _, incr := range tmspn.Increments {
@@ -585,7 +585,7 @@ func (sS *SessionS) refundSession(s *Session, sRunIdx int, rUsage time.Duration)
 		Subject:     sr.CD.Subject,
 		Account:     sr.CD.Account,
 		Destination: sr.CD.Destination,
-		TOR:         sr.CD.TOR,
+		TOR:         utils.FirstNonEmpty(sr.CD.TOR, utils.VOICE),
 		Increments:  incrmts,
 	}
 	var acnt engine.Account