diff --git a/engine/statsqueue.go b/engine/statsqueue.go
index 3e372dc13..a5acbfa02 100644
--- a/engine/statsqueue.go
+++ b/engine/statsqueue.go
@@ -18,6 +18,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>
 package engine
 
 import (
+	"errors"
 	"time"
 
 	"github.com/cgrates/cgrates/utils"
@@ -37,16 +38,6 @@ type SQStoredMetrics struct {
 	SQMetrics map[string][]byte
 }
 
-// StatsEvent is an event received by StatService
-type StatsEvent map[string]interface{}
-
-func (se StatsEvent) ID() (id string) {
-	if sID, has := se[utils.ID]; has {
-		id = sID.(string)
-	}
-	return
-}
-
 // StatsQueue represents the configuration of a  StatsInstance in StatS
 type StatsQueue struct {
 	ID                 string // QueueID
@@ -59,3 +50,29 @@ type StatsQueue struct {
 	Thresholds         []string // list of thresholds to be checked after changes
 	Weight             float64
 }
+
+// StatsEvent is an event received by StatService
+type StatsEvent map[string]interface{}
+
+func (se StatsEvent) ID() (id string) {
+	if sID, has := se[utils.ID]; has {
+		id = sID.(string)
+	}
+	return
+}
+
+// AnswerTime returns the AnswerTime of StatsEvent
+func (se StatsEvent) AnswerTime(timezone string) (at time.Time, err error) {
+	atIf, has := se[utils.ANSWER_TIME]
+	if !has {
+		return at, utils.ErrNotFound
+	}
+	if at, canCast := atIf.(time.Time); canCast {
+		return at, nil
+	}
+	atStr, canCast := atIf.(string)
+	if !canCast {
+		return at, errors.New("cannot cast to string")
+	}
+	return utils.ParseTimeDetectLayout(atStr, timezone)
+}
diff --git a/stats/acd.go b/stats/acd.go
index 5abf9576b..125050c10 100644
--- a/stats/acd.go
+++ b/stats/acd.go
@@ -19,6 +19,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>
 package stats
 
 import (
+	"time"
+
 	"github.com/cgrates/cgrates/engine"
 )
 
@@ -27,7 +29,10 @@ func NewACD() (StatsMetric, error) {
 }
 
 // ACD implements AverageCallDuration metric
-type ACD struct{}
+type ACD struct {
+	Sum   time.Duration
+	Count int
+}
 
 func (acd *ACD) GetStringValue(fmtOpts string) (val string) {
 	return
diff --git a/stats/asr.go b/stats/asr.go
index 16c815d1a..dc4964115 100644
--- a/stats/asr.go
+++ b/stats/asr.go
@@ -19,7 +19,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>
 package stats
 
 import (
+	"fmt"
+
+	"github.com/cgrates/cgrates/config"
 	"github.com/cgrates/cgrates/engine"
+	"github.com/cgrates/cgrates/utils"
 )
 
 func NewASR() (StatsMetric, error) {
@@ -28,26 +32,43 @@ func NewASR() (StatsMetric, error) {
 
 // ASR implements AverageSuccessRatio metric
 type ASR struct {
-	answered int
-	count    int
+	Answered float64
+	Count    float64
 }
 
-func (asr *ASR) GetStringValue(fmtOpts string) (val string) {
-	return
+func (asr *ASR) GetStringValue(fmtOpts string) (valStr string) {
+	if asr.Count == 0 {
+		return utils.NOT_AVAILABLE
+	}
+	val := utils.Round((asr.Answered / asr.Count * 100),
+		config.CgrConfig().RoundingDecimals, utils.ROUNDING_MIDDLE)
+	return fmt.Sprintf("%v%%", val)
 }
 
 func (asr *ASR) AddEvent(ev engine.StatsEvent) (err error) {
+	if at, err := ev.AnswerTime(config.CgrConfig().DefaultTimezone); err != nil {
+		return err
+	} else if !at.IsZero() {
+		asr.Answered += 1
+	}
+	asr.Count += 1
 	return
 }
 
 func (asr *ASR) RemEvent(ev engine.StatsEvent) (err error) {
+	if at, err := ev.AnswerTime(config.CgrConfig().DefaultTimezone); err != nil {
+		return err
+	} else if !at.IsZero() {
+		asr.Answered -= 1
+	}
+	asr.Count -= 1
 	return
 }
 
 func (asr *ASR) GetMarshaled(ms engine.Marshaler) (vals []byte, err error) {
-	return
+	return ms.Marshal(asr)
 }
 
 func (asr *ASR) SetFromMarshaled(vals []byte, ms engine.Marshaler) (err error) {
-	return
+	return ms.Unmarshal(vals, asr)
 }
diff --git a/stats/asr_test.go b/stats/asr_test.go
new file mode 100644
index 000000000..7064513c0
--- /dev/null
+++ b/stats/asr_test.go
@@ -0,0 +1,36 @@
+/*
+Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
+Copyright (C) ITsysCOM GmbH
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+package stats
+
+import (
+	"testing"
+	"time"
+
+	"github.com/cgrates/cgrates/engine"
+)
+
+func TestASRAddRemEvent(t *testing.T) {
+	asr, _ := NewASR()
+	ev := engine.StatsEvent{
+		"AnswerTime": time.Date(2014, 7, 14, 14, 25, 0, 0, time.UTC),
+	}
+	asr.AddEvent(ev)
+	if strVal := asr.GetStringValue(""); strVal != "100%" {
+		t.Errorf("wrong asr value: %s", strVal)
+	}
+}
diff --git a/stats/metric.go b/stats/metric.go
index 014462035..cd8987045 100644
--- a/stats/metric.go
+++ b/stats/metric.go
@@ -26,6 +26,7 @@ import (
 )
 
 // NewStatsMetrics instantiates the StatsMetrics
+// cfg serves as general purpose container to pass config options to metric
 func NewStatsMetric(metricID string) (sm StatsMetric, err error) {
 	metrics := map[string]func() (StatsMetric, error){
 		utils.MetaASR: NewASR,