diff --git a/apier/v1/routes_with_rates_it_test.go b/apier/v1/routes_with_rates_it_test.go
index f94acc903..590c7607b 100644
--- a/apier/v1/routes_with_rates_it_test.go
+++ b/apier/v1/routes_with_rates_it_test.go
@@ -39,7 +39,8 @@ var (
 		testV1RouteSWithRateSRpcConn,
 		testV1RouteSWithRateSFromFolder,
 		testV1RouteSWithRateSGetRoutes,
-		testV1RouteSWithRateSAccountWithRateProfile, //need to be discussed
+		testV1RouteSWithRateSAccountWithRateProfile,
+		testV1RouteSWithRateSWithEmptyRateProfileIDs,
 		testV1RouteSWithRateSStopEngine,
 	}
 )
@@ -380,6 +381,86 @@ func testV1RouteSWithRateSAccountWithRateProfile(t *testing.T) {
 
 }
 
+func testV1RouteSWithRateSWithEmptyRateProfileIDs(t *testing.T) {
+	routePrf = &RouteWithCache{
+		RouteProfile: &engine.RouteProfile{
+			Tenant:    "cgrates.org",
+			ID:        "RouteWithEmptyRatePRofileIDs",
+			FilterIDs: []string{"*string:~*req.EventName:testV1RouteSWithRateSWithEmptyRateProfileIDs"},
+			Sorting:   utils.MetaLC,
+			Routes: []*engine.Route{
+				{
+					ID:             "Route1",
+					RateProfileIDs: []string{"RT_ANY2CNT_SEC"},
+					Weight:         20,
+				},
+				{
+					ID:             "RouteWithEmptyRP",
+					RateProfileIDs: []string{}, // we send empty RateProfileIDs and expected to match RT_DEFAULT
+					Weight:         10,
+				},
+			},
+			Weight: 100,
+		},
+	}
+
+	var result string
+	if err := routeSv1Rpc.Call(utils.APIerSv1SetRouteProfile, routePrf, &result); err != nil {
+		t.Error(err)
+	} else if result != utils.OK {
+		t.Error("Unexpected reply returned", result)
+	}
+
+	ev := &engine.ArgsGetRoutes{
+		CGREventWithOpts: &utils.CGREventWithOpts{
+			CGREvent: &utils.CGREvent{
+				Tenant: "cgrates.org",
+				ID:     "testV1RouteSWithRateSGetRoutes",
+				Event: map[string]interface{}{
+					utils.Account:     "1003",
+					utils.Subject:     "1003",
+					utils.Destination: "1002",
+					utils.SetupTime:   time.Date(2017, 12, 1, 14, 25, 0, 0, time.UTC),
+					utils.Usage:       "1m20s",
+					"EventName":       "testV1RouteSWithRateSWithEmptyRateProfileIDs",
+				},
+			},
+		},
+	}
+
+	expRoutes := engine.SortedRoutes{
+		ProfileID: "RouteWithEmptyRatePRofileIDs",
+		Sorting:   utils.MetaLC,
+		Count:     2,
+		SortedRoutes: []*engine.SortedRoute{
+			{
+				RouteID: "RouteWithEmptyRP",
+				SortingData: map[string]interface{}{
+					utils.Cost:               0.1333333333333334,
+					utils.RateProfileMatched: "RT_DEFAULT",
+					utils.Weight:             10.0,
+				},
+			},
+			{
+				RouteID: "Route1",
+				SortingData: map[string]interface{}{
+					utils.Cost:               1.6,
+					utils.RateProfileMatched: "RT_ANY2CNT_SEC",
+					utils.Weight:             20.0,
+				},
+			},
+		},
+	}
+	var routesReply engine.SortedRoutes
+	if err := routeSv1Rpc.Call(utils.RouteSv1GetRoutes,
+		ev, &routesReply); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(expRoutes, routesReply) {
+		t.Errorf("Expecting: %s, \n received: %s",
+			utils.ToJSON(expRoutes), utils.ToJSON(routesReply))
+	}
+
+}
 func testV1RouteSWithRateSStopEngine(t *testing.T) {
 	if err := engine.KillEngine(100); err != nil {
 		t.Error(err)
diff --git a/data/tariffplans/routes_with_rates/RateProfiles.csv b/data/tariffplans/routes_with_rates/RateProfiles.csv
index b7fbdc23c..58bcb977d 100644
--- a/data/tariffplans/routes_with_rates/RateProfiles.csv
+++ b/data/tariffplans/routes_with_rates/RateProfiles.csv
@@ -4,4 +4,5 @@ cgrates.org,RT_RETAIL1,,,0,0,*up,4,0,0,*free,RT_ALWAYS,,"* * * * *",0,false,0s,0
 cgrates.org,RT_RETAIL1,,,,,,,,,,RT_ALWAYS,,"* * * * *",0,false,1m,0.2,1m,10s
 cgrates.org,RT_ANY2CNT_SEC,,,0,0,*up,4,0,0,*free,RT_ALWAYS,,"* * * * *",0,false,0s,0.02,1s,1s
 cgrates.org,RT_ANY1CNT_SEC,,,0,0,*up,4,0,0,*free,RT_ALWAYS,,"* * * * *",0,false,0s,0.01,1s,1s
+cgrates.org,RT_DEFAULT,,,20,0,*up,4,0,0,*free,RT_ALWAYS,,"* * * * *",0,false,0s,0.10,1m,10s
 
diff --git a/engine/route_highestcost.go b/engine/route_highestcost.go
index e156e7409..96553fb22 100755
--- a/engine/route_highestcost.go
+++ b/engine/route_highestcost.go
@@ -41,11 +41,11 @@ func (hcs *HightCostSorter) SortRoutes(prflID string, routes []*Route,
 		Sorting:      hcs.sorting,
 		SortedRoutes: make([]*SortedRoute, 0)}
 	for _, route := range routes {
-		if len(route.RatingPlanIDs) == 0 && len(route.AccountIDs) == 0 && len(route.RateProfileIDs) == 0 {
+		if len(route.RatingPlanIDs) == 0 && len(route.AccountIDs) == 0 && len(hcs.rS.cgrcfg.RouteSCfg().RateSConns) == 0 {
 			utils.Logger.Warning(
-				fmt.Sprintf("<%s> supplier: <%s> - empty RatingPlanIDs or AccountIDs or RateProfileIDs",
+				fmt.Sprintf("<%s> supplier: <%s> - empty RatingPlanIDs or AccountIDs or no connection with rateS",
 					utils.RouteS, route.ID))
-			return nil, utils.NewErrMandatoryIeMissing("RatingPlanIDs or AccountIDs or RateProfileIDs")
+			return nil, utils.NewErrMandatoryIeMissing("RatingPlanIDs or AccountIDs or connection with rateS")
 		}
 		if srtSpl, pass, err := hcs.rS.populateSortingData(ev, route, extraOpts); err != nil {
 			return nil, err
diff --git a/engine/route_leastcost.go b/engine/route_leastcost.go
index 971089a04..a0c47b9bc 100644
--- a/engine/route_leastcost.go
+++ b/engine/route_leastcost.go
@@ -41,11 +41,11 @@ func (lcs *LeastCostSorter) SortRoutes(prflID string, routes []*Route,
 		Sorting:      lcs.sorting,
 		SortedRoutes: make([]*SortedRoute, 0)}
 	for _, s := range routes {
-		if len(s.RatingPlanIDs) == 0 && len(s.AccountIDs) == 0 && len(s.RateProfileIDs) == 0 {
+		if len(s.RatingPlanIDs) == 0 && len(s.AccountIDs) == 0 && len(lcs.rS.cgrcfg.RouteSCfg().RateSConns) == 0 {
 			utils.Logger.Warning(
-				fmt.Sprintf("<%s> supplier: <%s> - empty RatingPlanIDs or AccountIDs or RateProfileIDs",
+				fmt.Sprintf("<%s> supplier: <%s> - empty RatingPlanIDs or AccountIDs or no connection with RateS",
 					utils.RouteS, s.ID))
-			return nil, utils.NewErrMandatoryIeMissing("RatingPlanIDs or AccountIDs or RateProfileIDs")
+			return nil, utils.NewErrMandatoryIeMissing("RatingPlanIDs or AccountIDs or connection with RateS")
 		}
 		if srtSpl, pass, err := lcs.rS.populateSortingData(ev, s, extraOpts); err != nil {
 			return nil, err
diff --git a/engine/routes.go b/engine/routes.go
index 4d3d62f0e..f876ffc34 100644
--- a/engine/routes.go
+++ b/engine/routes.go
@@ -262,8 +262,8 @@ func (rpS *RouteService) costForEvent(ev *utils.CGREvent,
 			}
 			if usage > accountMaxUsage {
 				// remain usage needs to be covered by rating plans
-				if len(rpIDs) == 0 && len(rtPrfIDs) == 0 {
-					return nil, fmt.Errorf("no rating plans or rate profiles defined for remaining usage")
+				if len(rpIDs) == 0 && len(rpS.cgrcfg.RouteSCfg().RateSConns) == 0 {
+					return nil, fmt.Errorf("no rating plans or no connection to RateS defined for remaining usage")
 				}
 				// update the setup time and the usage
 				sTime = sTime.Add(accountMaxUsage)
@@ -420,7 +420,7 @@ func (rpS *RouteService) populateSortingData(ev *utils.CGREvent, route *Route,
 		RouteParameters: route.RouteParameters,
 	}
 	//calculate costData if we have fields
-	if len(route.AccountIDs) != 0 || len(route.RatingPlanIDs) != 0 || len(route.RateProfileIDs) != 0 {
+	if len(route.AccountIDs) != 0 || len(route.RatingPlanIDs) != 0 || len(rpS.cgrcfg.RouteSCfg().RateSConns) != 0 {
 		costData, err := rpS.costForEvent(ev, route.AccountIDs, route.RatingPlanIDs, route.RateProfileIDs)
 		if err != nil {
 			if extraOpts.ignoreErrors {