diff --git a/sessionmanager/smg_event.go b/sessionmanager/smg_event.go
index aefe28dfb..be0d319a7 100644
--- a/sessionmanager/smg_event.go
+++ b/sessionmanager/smg_event.go
@@ -161,6 +161,14 @@ func (self SMGenericEvent) GetUsage(fieldName string) (time.Duration, error) {
 	return utils.ParseDurationWithSecs(result)
 }
 
+func (self SMGenericEvent) GetLastUsed(fieldName string) (time.Duration, error) {
+	if fieldName == utils.META_DEFAULT {
+		fieldName = utils.LastUsed
+	}
+	result, _ := utils.ConvertIfaceToString(self[fieldName])
+	return utils.ParseDurationWithSecs(result)
+}
+
 func (self SMGenericEvent) GetMaxUsage(fieldName string, cfgMaxUsage time.Duration) (time.Duration, error) {
 	if fieldName == utils.META_DEFAULT {
 		fieldName = utils.USAGE
@@ -212,7 +220,7 @@ func (self SMGenericEvent) GetCdrSource() string {
 func (self SMGenericEvent) GetExtraFields() map[string]string {
 	extraFields := make(map[string]string)
 	for key, val := range self {
-		primaryFields := append(utils.PrimaryCdrFields, utils.EVENT_NAME)
+		primaryFields := append(utils.PrimaryCdrFields, utils.EVENT_NAME, utils.LastUsed)
 		if utils.IsSliceMember(primaryFields, key) {
 			continue
 		}
diff --git a/sessionmanager/smg_event_test.go b/sessionmanager/smg_event_test.go
index 091453f65..4cc80781c 100644
--- a/sessionmanager/smg_event_test.go
+++ b/sessionmanager/smg_event_test.go
@@ -45,6 +45,7 @@ func TestSMGenericEventParseFields(t *testing.T) {
 	smGev[utils.SETUP_TIME] = "2015-11-09 14:21:24"
 	smGev[utils.ANSWER_TIME] = "2015-11-09 14:22:02"
 	smGev[utils.USAGE] = "1m23s"
+	smGev[utils.LastUsed] = "21s"
 	smGev[utils.PDD] = "300ms"
 	smGev[utils.SUPPLIER] = "supplier1"
 	smGev[utils.DISCONNECT_CAUSE] = "NORMAL_DISCONNECT"
@@ -107,6 +108,11 @@ func TestSMGenericEventParseFields(t *testing.T) {
 	} else if dur != time.Duration(83)*time.Second {
 		t.Error("Unexpected: ", dur)
 	}
+	if lastUsed, err := smGev.GetLastUsed(utils.META_DEFAULT); err != nil {
+		t.Error(err)
+	} else if lastUsed != time.Duration(21)*time.Second {
+		t.Error("Unexpected: ", lastUsed)
+	}
 	if pdd, err := smGev.GetPdd(utils.META_DEFAULT); err != nil {
 		t.Error(err)
 	} else if pdd != time.Duration(300)*time.Millisecond {
diff --git a/utils/consts.go b/utils/consts.go
index a2324b8e0..e197a5083 100644
--- a/utils/consts.go
+++ b/utils/consts.go
@@ -124,6 +124,7 @@ const (
 	SETUP_TIME                   = "SetupTime"
 	ANSWER_TIME                  = "AnswerTime"
 	USAGE                        = "Usage"
+	LastUsed                     = "LastUsed"
 	PDD                          = "PDD"
 	SUPPLIER                     = "Supplier"
 	MEDI_RUNID                   = "RunID"