diff --git a/agents/diam_it_test.go b/agents/diam_it_test.go
index 6d3395bca..e2199d57e 100644
--- a/agents/diam_it_test.go
+++ b/agents/diam_it_test.go
@@ -58,6 +58,7 @@ var (
 		testDiamItTPFromFolder,
 		testDiamItDryRun,
 		testDiamItCCRInit,
+		testDiamItCCRInitWithForceDuration,
 		testDiamItCCRUpdate,
 		testDiamItCCRTerminate,
 		testDiamItCCRSMS,
@@ -638,6 +639,83 @@ func testDiamItCCRInit(t *testing.T) {
 	}
 }
 
+func testDiamItCCRInitWithForceDuration(t *testing.T) {
+	m := diam.NewRequest(diam.CreditControl, 4, nil)
+	m.NewAVP(avp.SessionID, avp.Mbit, 0, datatype.UTF8String("bb97be2b9f37c2be9614fff71c8b1d08b1acbff0"))
+	m.NewAVP(avp.OriginHost, avp.Mbit, 0, datatype.DiameterIdentity("192.168.1.1"))
+	m.NewAVP(avp.OriginRealm, avp.Mbit, 0, datatype.DiameterIdentity("cgrates.org"))
+	m.NewAVP(avp.AuthApplicationID, avp.Mbit, 0, datatype.Unsigned32(4))
+	m.NewAVP(avp.CCRequestType, avp.Mbit, 0, datatype.Enumerated(1))
+	m.NewAVP(avp.CCRequestNumber, avp.Mbit, 0, datatype.Unsigned32(0))
+	m.NewAVP(avp.DestinationHost, avp.Mbit, 0, datatype.DiameterIdentity("CGR-DA"))
+	m.NewAVP(avp.DestinationRealm, avp.Mbit, 0, datatype.DiameterIdentity("cgrates.org"))
+	m.NewAVP(avp.ServiceContextID, avp.Mbit, 0, datatype.UTF8String("forceDurationVoice@DiamItCCRInit"))
+	m.NewAVP(avp.EventTimestamp, avp.Mbit, 0, datatype.Time(time.Date(2018, 10, 4, 14, 42, 20, 0, time.UTC)))
+	m.NewAVP(avp.SubscriptionID, avp.Mbit, 0, &diam.GroupedAVP{
+		AVP: []*diam.AVP{
+			diam.NewAVP(450, avp.Mbit, 0, datatype.Enumerated(0)),      // Subscription-Id-Type
+			diam.NewAVP(444, avp.Mbit, 0, datatype.UTF8String("1006")), // Subscription-Id-Data
+		}})
+	m.NewAVP(avp.ServiceIdentifier, avp.Mbit, 0, datatype.Unsigned32(0))
+	m.NewAVP(avp.RequestedServiceUnit, avp.Mbit, 0, &diam.GroupedAVP{
+		AVP: []*diam.AVP{
+			diam.NewAVP(420, avp.Mbit, 0, datatype.Unsigned32(3000000))}})
+	m.NewAVP(avp.UsedServiceUnit, avp.Mbit, 0, &diam.GroupedAVP{
+		AVP: []*diam.AVP{
+			diam.NewAVP(420, avp.Mbit, 0, datatype.Unsigned32(0))}})
+	m.NewAVP(873, avp.Mbit, 10415, &diam.GroupedAVP{
+		AVP: []*diam.AVP{
+			diam.NewAVP(20300, avp.Mbit, 2011, &diam.GroupedAVP{ // IN-Information
+				AVP: []*diam.AVP{
+					diam.NewAVP(831, avp.Mbit, 10415, datatype.UTF8String("1006")),                                      // Calling-Party-Address
+					diam.NewAVP(832, avp.Mbit, 10415, datatype.UTF8String("1002")),                                      // Called-Party-Address
+					diam.NewAVP(20327, avp.Mbit, 2011, datatype.UTF8String("1002")),                                     // Real-Called-Number
+					diam.NewAVP(20339, avp.Mbit, 2011, datatype.Unsigned32(0)),                                          // Charge-Flow-Type
+					diam.NewAVP(20302, avp.Mbit, 2011, datatype.UTF8String("")),                                         // Calling-Vlr-Number
+					diam.NewAVP(20303, avp.Mbit, 2011, datatype.UTF8String("")),                                         // Calling-CellID-Or-SAI
+					diam.NewAVP(20313, avp.Mbit, 2011, datatype.OctetString("")),                                        // Bearer-Capability
+					diam.NewAVP(20321, avp.Mbit, 2011, datatype.UTF8String("bb97be2b9f37c2be9614fff71c8b1d08b1acbff8")), // Call-Reference-Number
+					diam.NewAVP(20322, avp.Mbit, 2011, datatype.UTF8String("")),                                         // MSC-Address
+					diam.NewAVP(20324, avp.Mbit, 2011, datatype.Unsigned32(0)),                                          // Time-Zone
+					diam.NewAVP(20385, avp.Mbit, 2011, datatype.UTF8String("")),                                         // Called-Party-NP
+					diam.NewAVP(20386, avp.Mbit, 2011, datatype.UTF8String("")),                                         // SSP-Time
+				},
+			}),
+		}})
+	// ============================================
+	// prevent nil pointer dereference
+	// ============================================
+	if diamClnt == nil {
+		t.Fatal("Diameter client should not be nil")
+	}
+	if diamClnt.conn == nil {
+		t.Fatal("Diameter connection should not be nil")
+	}
+	if m == nil {
+		t.Fatal("The mesage to diameter should not be nil")
+	}
+	// ============================================
+	if err := diamClnt.SendMessage(m); err != nil {
+		t.Error(err)
+	}
+	msg := diamClnt.ReceivedMessage(rplyTimeout)
+	if msg == nil {
+		t.Fatal("No message returned")
+	}
+	// Result-Code
+	eVal := "5030"
+	if avps, err := msg.FindAVPsWithPath([]interface{}{"Result-Code"}, dict.UndefinedVendorID); err != nil {
+		t.Error(err)
+	} else if len(avps) == 0 {
+		t.Error("Missing AVP")
+	} else if val, err := diamAVPAsString(avps[0]); err != nil {
+		t.Error(err)
+	} else if val != eVal {
+		t.Errorf("expecting: %s, received: <%s>", eVal, val)
+	}
+
+}
+
 func testDiamItCCRUpdate(t *testing.T) {
 	m := diam.NewRequest(diam.CreditControl, 4, nil)
 	m.NewAVP(avp.SessionID, avp.Mbit, 0, datatype.UTF8String("bb97be2b9f37c2be9614fff71c8b1d08b1acbff8"))
diff --git a/data/conf/samples/diamagent_internal/voice.json b/data/conf/samples/diamagent_internal/voice.json
index 7b444abdc..91de9c026 100644
--- a/data/conf/samples/diamagent_internal/voice.json
+++ b/data/conf/samples/diamagent_internal/voice.json
@@ -3,6 +3,105 @@
 
 "diameter_agent": {
 	"request_processors": [
+		{
+			"id": "VoiceInitForceDuration",
+			"filters": [
+				"*string:~*vars.*cmd:CCR",
+				"*string:~*req.CC-Request-Type:1",
+				"*prefix:~*req.Service-Context-Id:forceDurationVoice"
+			],
+			"flags": ["*initiate", "*fd", "*accounts", "*attributes"],
+			"request_fields":[
+				{
+					"tag": "ToR",
+					"path": "*cgreq.ToR",
+					"type": "*constant",
+					"value": "*voice"
+				},
+				{
+					"tag": "OriginID",
+					"path": "*cgreq.OriginID",
+					"type": "*variable",
+					"value": "~*req.Session-Id",
+					"mandatory": true
+				},
+				{
+					"tag": "OriginHost",
+					"path": "*cgreq.OriginHost",
+					"type": "*remote_host",
+					"mandatory": true
+				},
+				{
+					"tag": "RequestType",
+					"path": "*cgreq.RequestType",
+					"type": "*constant",
+					"value": "*attributes"
+				},
+				{
+					"tag": "Category",
+					"path": "*cgreq.Category",
+					"type": "*constant",
+					"value": "call"
+				},
+				{
+					"tag": "Account",
+					"path": "*cgreq.Account",
+					"type": "*constant",
+					"value": "*attributes"
+				},
+				{
+					"tag": "Destination",
+					"path": "*cgreq.Destination",
+					"type": "*variable",
+					"value": "~*req.Service-Information.IN-Information.Real-Called-Number",
+					"mandatory": true
+				},
+				{
+					"tag": "AnswerTime",
+					"path": "*cgreq.AnswerTime",
+					"type": "*variable",
+					"value": "~*req.Event-Timestamp",
+					"mandatory": true
+				},
+				{
+					"tag": "Usage",
+					"path": "*cgreq.Usage",
+					"type": "*variable",
+					"value": "~*req.Requested-Service-Unit.CC-Time:s/(.*)/${1}s/",
+					"mandatory": true
+				},
+				{
+					"tag": "SubscriberID",
+					"path": "*cgreq.SubscriberId",
+					"type": "*variable",
+					"value": "~*req.Subscription-Id.Subscription-Id-Data",
+					"mandatory": true
+				},
+			],
+			"reply_fields":[
+				{
+					"tag": "ResultCode",
+					"filters": ["*notempty:~*cgrep.Error:"],
+					"path": "*rep.Result-Code",
+					"type": "*constant",
+					"value": "5030",
+					"blocker": true
+				},
+				{
+					"tag": "ResultCode",
+					"path": "*rep.Result-Code",
+					"type": "*constant",
+					"value": "2001"
+				},
+				{
+					"tag": "GrantedUnits",
+					"path": "*rep.Granted-Service-Unit.CC-Time",
+					"type": "*variable",
+					"value": "~*cgrep.MaxUsage{*duration_seconds}",
+					"mandatory": true
+				},
+			],
+		},
 		{
 			"id": "VoiceInit",
 			"filters": [
diff --git a/data/conf/samples/diamagent_mongo/voice.json b/data/conf/samples/diamagent_mongo/voice.json
index 7b444abdc..91de9c026 100644
--- a/data/conf/samples/diamagent_mongo/voice.json
+++ b/data/conf/samples/diamagent_mongo/voice.json
@@ -3,6 +3,105 @@
 
 "diameter_agent": {
 	"request_processors": [
+		{
+			"id": "VoiceInitForceDuration",
+			"filters": [
+				"*string:~*vars.*cmd:CCR",
+				"*string:~*req.CC-Request-Type:1",
+				"*prefix:~*req.Service-Context-Id:forceDurationVoice"
+			],
+			"flags": ["*initiate", "*fd", "*accounts", "*attributes"],
+			"request_fields":[
+				{
+					"tag": "ToR",
+					"path": "*cgreq.ToR",
+					"type": "*constant",
+					"value": "*voice"
+				},
+				{
+					"tag": "OriginID",
+					"path": "*cgreq.OriginID",
+					"type": "*variable",
+					"value": "~*req.Session-Id",
+					"mandatory": true
+				},
+				{
+					"tag": "OriginHost",
+					"path": "*cgreq.OriginHost",
+					"type": "*remote_host",
+					"mandatory": true
+				},
+				{
+					"tag": "RequestType",
+					"path": "*cgreq.RequestType",
+					"type": "*constant",
+					"value": "*attributes"
+				},
+				{
+					"tag": "Category",
+					"path": "*cgreq.Category",
+					"type": "*constant",
+					"value": "call"
+				},
+				{
+					"tag": "Account",
+					"path": "*cgreq.Account",
+					"type": "*constant",
+					"value": "*attributes"
+				},
+				{
+					"tag": "Destination",
+					"path": "*cgreq.Destination",
+					"type": "*variable",
+					"value": "~*req.Service-Information.IN-Information.Real-Called-Number",
+					"mandatory": true
+				},
+				{
+					"tag": "AnswerTime",
+					"path": "*cgreq.AnswerTime",
+					"type": "*variable",
+					"value": "~*req.Event-Timestamp",
+					"mandatory": true
+				},
+				{
+					"tag": "Usage",
+					"path": "*cgreq.Usage",
+					"type": "*variable",
+					"value": "~*req.Requested-Service-Unit.CC-Time:s/(.*)/${1}s/",
+					"mandatory": true
+				},
+				{
+					"tag": "SubscriberID",
+					"path": "*cgreq.SubscriberId",
+					"type": "*variable",
+					"value": "~*req.Subscription-Id.Subscription-Id-Data",
+					"mandatory": true
+				},
+			],
+			"reply_fields":[
+				{
+					"tag": "ResultCode",
+					"filters": ["*notempty:~*cgrep.Error:"],
+					"path": "*rep.Result-Code",
+					"type": "*constant",
+					"value": "5030",
+					"blocker": true
+				},
+				{
+					"tag": "ResultCode",
+					"path": "*rep.Result-Code",
+					"type": "*constant",
+					"value": "2001"
+				},
+				{
+					"tag": "GrantedUnits",
+					"path": "*rep.Granted-Service-Unit.CC-Time",
+					"type": "*variable",
+					"value": "~*cgrep.MaxUsage{*duration_seconds}",
+					"mandatory": true
+				},
+			],
+		},
 		{
 			"id": "VoiceInit",
 			"filters": [
diff --git a/data/conf/samples/diamagent_mysql/voice.json b/data/conf/samples/diamagent_mysql/voice.json
index 7b444abdc..91de9c026 100644
--- a/data/conf/samples/diamagent_mysql/voice.json
+++ b/data/conf/samples/diamagent_mysql/voice.json
@@ -3,6 +3,105 @@
 
 "diameter_agent": {
 	"request_processors": [
+		{
+			"id": "VoiceInitForceDuration",
+			"filters": [
+				"*string:~*vars.*cmd:CCR",
+				"*string:~*req.CC-Request-Type:1",
+				"*prefix:~*req.Service-Context-Id:forceDurationVoice"
+			],
+			"flags": ["*initiate", "*fd", "*accounts", "*attributes"],
+			"request_fields":[
+				{
+					"tag": "ToR",
+					"path": "*cgreq.ToR",
+					"type": "*constant",
+					"value": "*voice"
+				},
+				{
+					"tag": "OriginID",
+					"path": "*cgreq.OriginID",
+					"type": "*variable",
+					"value": "~*req.Session-Id",
+					"mandatory": true
+				},
+				{
+					"tag": "OriginHost",
+					"path": "*cgreq.OriginHost",
+					"type": "*remote_host",
+					"mandatory": true
+				},
+				{
+					"tag": "RequestType",
+					"path": "*cgreq.RequestType",
+					"type": "*constant",
+					"value": "*attributes"
+				},
+				{
+					"tag": "Category",
+					"path": "*cgreq.Category",
+					"type": "*constant",
+					"value": "call"
+				},
+				{
+					"tag": "Account",
+					"path": "*cgreq.Account",
+					"type": "*constant",
+					"value": "*attributes"
+				},
+				{
+					"tag": "Destination",
+					"path": "*cgreq.Destination",
+					"type": "*variable",
+					"value": "~*req.Service-Information.IN-Information.Real-Called-Number",
+					"mandatory": true
+				},
+				{
+					"tag": "AnswerTime",
+					"path": "*cgreq.AnswerTime",
+					"type": "*variable",
+					"value": "~*req.Event-Timestamp",
+					"mandatory": true
+				},
+				{
+					"tag": "Usage",
+					"path": "*cgreq.Usage",
+					"type": "*variable",
+					"value": "~*req.Requested-Service-Unit.CC-Time:s/(.*)/${1}s/",
+					"mandatory": true
+				},
+				{
+					"tag": "SubscriberID",
+					"path": "*cgreq.SubscriberId",
+					"type": "*variable",
+					"value": "~*req.Subscription-Id.Subscription-Id-Data",
+					"mandatory": true
+				},
+			],
+			"reply_fields":[
+				{
+					"tag": "ResultCode",
+					"filters": ["*notempty:~*cgrep.Error:"],
+					"path": "*rep.Result-Code",
+					"type": "*constant",
+					"value": "5030",
+					"blocker": true
+				},
+				{
+					"tag": "ResultCode",
+					"path": "*rep.Result-Code",
+					"type": "*constant",
+					"value": "2001"
+				},
+				{
+					"tag": "GrantedUnits",
+					"path": "*rep.Granted-Service-Unit.CC-Time",
+					"type": "*variable",
+					"value": "~*cgrep.MaxUsage{*duration_seconds}",
+					"mandatory": true
+				},
+			],
+		},
 		{
 			"id": "VoiceInit",
 			"filters": [