diff --git a/fr-net/gen_links.sh b/fr-net/gen_links.sh
index 29f4399f8..413676c37 100755
--- a/fr-net/gen_links.sh
+++ b/fr-net/gen_links.sh
@@ -47,7 +47,7 @@ gen_links $DIR $FILES
 
 DIR=../library
 FILES="Misc_Helpers.ttcn General_Types.ttcn Osmocom_VTY_Functions.ttcn Native_Functions.ttcn Native_FunctionDefs.cc GSM_Types.ttcn Osmocom_Types.ttcn "
-FILES+="NS_Provider_IPL4.ttcn NS_Provider_FR.ttcn NS_Emulation.ttcnpp "
+FILES+="RAW_NS.ttcnpp NS_Provider_IPL4.ttcn NS_Provider_FR.ttcn NS_Emulation.ttcnpp "
 FILES+="BSSGP_Emulation.ttcnpp Osmocom_Gb_Types.ttcn "
 FILES+="LLC_Templates.ttcn "
 gen_links $DIR $FILES
diff --git a/fr/gen_links.sh b/fr/gen_links.sh
index 29f4399f8..413676c37 100755
--- a/fr/gen_links.sh
+++ b/fr/gen_links.sh
@@ -47,7 +47,7 @@ gen_links $DIR $FILES
 
 DIR=../library
 FILES="Misc_Helpers.ttcn General_Types.ttcn Osmocom_VTY_Functions.ttcn Native_Functions.ttcn Native_FunctionDefs.cc GSM_Types.ttcn Osmocom_Types.ttcn "
-FILES+="NS_Provider_IPL4.ttcn NS_Provider_FR.ttcn NS_Emulation.ttcnpp "
+FILES+="RAW_NS.ttcnpp NS_Provider_IPL4.ttcn NS_Provider_FR.ttcn NS_Emulation.ttcnpp "
 FILES+="BSSGP_Emulation.ttcnpp Osmocom_Gb_Types.ttcn "
 FILES+="LLC_Templates.ttcn "
 gen_links $DIR $FILES
diff --git a/gbproxy/gen_links.sh b/gbproxy/gen_links.sh
index d6bf22e0a..6d4ab81d9 100755
--- a/gbproxy/gen_links.sh
+++ b/gbproxy/gen_links.sh
@@ -84,7 +84,7 @@ gen_links $DIR $FILES
 
 DIR=../library
 FILES="Misc_Helpers.ttcn General_Types.ttcn GSM_Types.ttcn GSM_RR_Types.ttcn Osmocom_Types.ttcn RLCMAC_Templates.ttcn RLCMAC_Types.ttcn RLCMAC_CSN1_Templates.ttcn RLCMAC_CSN1_Types.ttcn RLCMAC_EncDec.cc "
-FILES+="NS_Provider_IPL4.ttcn NS_Provider_FR.ttcn NS_Emulation.ttcnpp "
+FILES+="RAW_NS.ttcnpp NS_Provider_IPL4.ttcn NS_Provider_FR.ttcn NS_Emulation.ttcnpp "
 FILES+="BSSGP_Emulation.ttcnpp Osmocom_Gb_Types.ttcn "
 FILES+="PCUIF_Types.ttcn "
 FILES+="Osmocom_CTRL_Types.ttcn Osmocom_CTRL_Functions.ttcn Osmocom_CTRL_Adapter.ttcn "
diff --git a/library/NS_Provider_IPL4.ttcn b/library/NS_Provider_IPL4.ttcn
index 774c08a8b..09e7dc0e2 100644
--- a/library/NS_Provider_IPL4.ttcn
+++ b/library/NS_Provider_IPL4.ttcn
@@ -27,6 +27,7 @@ module NS_Provider_IPL4 {
 
 import from Misc_Helpers all;
 import from NS_Emulation all;
+import from RAW_NS all;
 import from NS_Types all;
 
 import from IPL4asp_Types all;
@@ -42,6 +43,7 @@ type component NS_Provider_IPL4_CT extends NS_Provider_CT {
 
 	/* per-NSVC ports and state */
 	port NS_PROVIDER_PT NSVC[NUM_MAX_NSVC];
+	var boolean g_nsvc_bound[NUM_MAX_NSVC];
 	var PerNsvcState g_nsvc[NUM_MAX_NSVC];
 
 	/* management port via which  */
@@ -54,31 +56,35 @@ type record PerNsvcState {
 	NSVC_CT	vc_nsvc
 };
 
-signature NSPIP_add_nsvc(charstring remote_ip, PortNumber remote_port, NSVC_CT vc_nsvc);
-signature NSPIP_del_nsvc(charstring remote_ip, PortNumber remote_port);
+signature NSPIP_add_nsvc(charstring remote_ip, PortNumber remote_port, NSVC_CT vc_nsvc) return integer;
+signature NSPIP_del_nsvc(charstring remote_ip, PortNumber remote_port) return integer;
 
 type port NSPIP_PROC_PT procedure {
 	inout NSPIP_add_nsvc, NSPIP_del_nsvc;
 } with { extension "internal" };
 
 /* add a new NSVC to the provider */
-private function f_nsvc_add(PerNsvcState nsvc) runs on NS_Provider_IPL4_CT
+private function f_nsvc_add(PerNsvcState nsvc) runs on NS_Provider_IPL4_CT return integer
 {
 	for (var integer i := 0; i < sizeof(g_nsvc); i := i+1) {
-		if (g_nsvc[i].vc_nsvc == null) {
+		if (g_nsvc_bound[i] == false) {
 			g_nsvc[i] := nsvc;
-			connect(self:NSVC[i], nsvc.vc_nsvc:NSCP);
-			NSVC[i].send(NS_Provider_Evt:{link_status := NS_PROV_LINK_STATUS_UP});
-			return;
+			g_nsvc_bound[i] := true;
+			if (isbound(nsvc.vc_nsvc) and nsvc.vc_nsvc != null) {
+				connect(self:NSVC[i], nsvc.vc_nsvc:NSCP);
+				NSVC[i].send(NS_Provider_Evt:{link_status := NS_PROV_LINK_STATUS_UP});
+			}
+			return i;
 		}
 	}
 	Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("Overflow of g_nsvc array"));
+	return -1;
 }
 
-private function f_nsvc_del(PerNsvcState nsvc) runs on NS_Provider_IPL4_CT
+private function f_nsvc_del(PerNsvcState nsvc) runs on NS_Provider_IPL4_CT return integer
 {
 	for (var integer i := 0; i < sizeof(g_nsvc); i := i+1) {
-		if (g_nsvc[i].vc_nsvc != null and
+		if (g_nsvc_bound[i] and
 		    g_nsvc[i].remote_ip == nsvc.remote_ip and
 		    g_nsvc[i].remote_port == nsvc.remote_port) {
 			g_nsvc[i] := {
@@ -86,19 +92,23 @@ private function f_nsvc_del(PerNsvcState nsvc) runs on NS_Provider_IPL4_CT
 				remote_port := -,
 				vc_nsvc := null
 			}
+			g_nsvc_bound[i] := false;
 			NSVC[i].send(NS_Provider_Evt:{link_status := NS_PROV_LINK_STATUS_DOWN});
-			disconnect(self:NSVC[i], nsvc.vc_nsvc:NSCP);
-			return;
+			if (isbound(g_nsvc[i].vc_nsvc) and g_nsvc[i].vc_nsvc != null) {
+				disconnect(self:NSVC[i], nsvc.vc_nsvc:NSCP);
+			}
+			return i;
 		}
 	}
 	Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("attempt to delete unknown NSVC"));
+	return -1;
 }
 
 private function f_get_nsvc_idx(charstring remote_ip, PortNumber remote_port)
 runs on NS_Provider_IPL4_CT return integer
 {
 	for (var integer i := 0; i < sizeof(g_nsvc); i := i+1) {
-		if (g_nsvc[i].vc_nsvc != null and
+		if (g_nsvc_bound[i] and
 		    g_nsvc[i].remote_ip == remote_ip and g_nsvc[i].remote_port == remote_port) {
 			return i;
 		}
@@ -109,6 +119,7 @@ runs on NS_Provider_IPL4_CT return integer
 function main(NSVCConfiguration config, NSConfiguration nsconfig, charstring id) runs on NS_Provider_IPL4_CT {
 	for (var integer i := 0; i < sizeof(g_nsvc); i := i+1) {
 		g_nsvc[i].vc_nsvc := null;
+		g_nsvc_bound[i] := false;
 	}
 
 	/* in order to support any number of NSVC on this endpoiint, we only bind the socket
@@ -182,12 +193,14 @@ function main(NSVCConfiguration config, NSConfiguration nsconfig, charstring id)
 
 	/* procedure port to add/remove NSVCs from this provider */
 	[] PROC.getcall(NSPIP_add_nsvc:{?,?,?}) -> param (remote_ip, remote_port, vc_nsvc) sender vc_caller {
-		f_nsvc_add(PerNsvcState:{remote_ip, remote_port, vc_nsvc});
-		PROC.reply(NSPIP_add_nsvc:{remote_ip, remote_port, vc_nsvc}) to vc_caller;
+		var integer idx;
+		idx := f_nsvc_add(PerNsvcState:{remote_ip, remote_port, vc_nsvc});
+		PROC.reply(NSPIP_add_nsvc:{remote_ip, remote_port, vc_nsvc} value idx) to vc_caller;
 		}
 	[] PROC.getcall(NSPIP_del_nsvc:{?,?}) -> param (remote_ip, remote_port) sender vc_caller {
-		f_nsvc_del(PerNsvcState:{remote_ip, remote_port});
-		PROC.reply(NSPIP_del_nsvc:{remote_ip, remote_port}) to vc_caller;
+		var integer idx;
+		idx := f_nsvc_del(PerNsvcState:{remote_ip, remote_port});
+		PROC.reply(NSPIP_del_nsvc:{remote_ip, remote_port} value idx) to vc_caller;
 		}
 
 	} /* alt */
@@ -197,9 +210,20 @@ function main(NSVCConfiguration config, NSConfiguration nsconfig, charstring id)
 
 function f_nspip_add_nsvc(NS_Provider_IPL4_CT vc_ipep, charstring remote_ip, PortNumber remote_port, NSVC_CT vc_nsvc)
 runs on NS_CT {
+	var integer idx := -1;
 	NSPIP_PROC.call(NSPIP_add_nsvc:{remote_ip, remote_port, vc_nsvc}) to vc_ipep {
-		[] NSPIP_PROC.getreply(NSPIP_add_nsvc:{?,?,?});
+		[] NSPIP_PROC.getreply(NSPIP_add_nsvc:{?,?,?}) -> value idx;
 	}
 }
 
+function f_nspip_add_nsvc2(NS_Provider_IPL4_CT vc_ipep, charstring remote_ip, PortNumber remote_port)
+runs on RAW_NS_CT return integer {
+	var integer idx := -1;
+	NSPIP_PROC.call(NSPIP_add_nsvc:{remote_ip, remote_port, null}) to vc_ipep {
+		[] NSPIP_PROC.getreply(NSPIP_add_nsvc:{?,?,?}) -> value idx;
+	}
+
+	return idx;
+}
+
 } /* module */
diff --git a/library/RAW_NS.ttcnpp b/library/RAW_NS.ttcnpp
index 42efb7d56..6930a727b 100644
--- a/library/RAW_NS.ttcnpp
+++ b/library/RAW_NS.ttcnpp
@@ -25,16 +25,24 @@ import from NS_Provider_IPL4 all;
 import from NS_Provider_FR all;
 #endif
 
+type record PerIPProvider {
+	NS_Provider_IPL4_CT vc_NSP_IP,
+	charstring local_ip,
+	PortNumber local_udp_port
+}
+
 public type component RAW_NS_CT {
 	/* UDP port towards the bottom (IUT) */
 	port NS_PROVIDER_PT NSCP[4];
-	var NS_Provider_IPL4_CT vc_NSP_IP[4];
+	var PerIPProvider ip_prov[4];
+	port NSPIP_PROC_PT NSPIP_PROC;
 #ifdef NS_EMULATION_FR
 	var NS_Provider_FR_CT vc_NSP_FR[4];
 #endif
 	var NSConfiguration g_nsconfig;
 	timer g_T_guard;
 	var boolean g_handle_rx_alive := false;
+	var boolean rawns_initialized := false;
 }
 
 public altstep as_Tguard() runs on RAW_NS_CT {
@@ -44,6 +52,21 @@ public altstep as_Tguard() runs on RAW_NS_CT {
 		}
 }
 
+function f_find_ip_provider(NSVCConfigurationIP nsip_config)
+runs on RAW_NS_CT return integer {
+	for (var integer idx := 0; idx < sizeof(ip_prov); idx := idx+1) {
+		if (ip_prov[idx].vc_NSP_IP == null) {
+			continue;
+		}
+
+		if (ip_prov[idx].local_ip == nsip_config.local_ip and
+			ip_prov[idx].local_udp_port == nsip_config.local_udp_port) {
+			return idx;
+		}
+	}
+	return -1;
+}
+
 function f_init_ns_codec(NSConfiguration ns_config, integer idx := 0, float guard_secs := 60.0, charstring id := testcasename()) runs on RAW_NS_CT {
 	var Result res;
 
@@ -52,31 +75,58 @@ function f_init_ns_codec(NSConfiguration ns_config, integer idx := 0, float guar
 		activate(as_Tguard());
 	}
 
+	if (not rawns_initialized) {
+		for (var integer i := 0; i < sizeof(ip_prov); i := i+1) {
+			ip_prov[i].vc_NSP_IP := null;
+		}
+		rawns_initialized := true;
+	}
+
 	if (not isbound(g_nsconfig)) {
 		g_nsconfig := ns_config;
 	}
 
 	if (ischosen(ns_config.nsvc[idx].provider.ip)) {
-		/* Connect the UDP socket */
-		vc_NSP_IP[idx] := NS_Provider_IPL4_CT.create(id & "-provIP");
-		connect(self:NSCP[idx], vc_NSP_IP[idx]:NSE);
-		vc_NSP_IP[idx].start(NS_Provider_IPL4.main(ns_config.nsvc[idx], ns_config, id));
+		var integer prov_idx := f_find_ip_provider(ns_config.nsvc[idx].provider.ip);
+		/* Connect the UDP socket
+		 * check if NS_Provider_IPL4_CT is already created
+		 * add list of vc_NSP_IP with entries of source ip/port
+		 * add a NSVC to it */
+		if (prov_idx == -1) {
+			for (prov_idx := 0; prov_idx < sizeof(ip_prov); prov_idx := prov_idx+1) {
+				if (ip_prov[prov_idx].vc_NSP_IP == null) {
+					break;
+				}
+			}
+			if (prov_idx > sizeof(ip_prov)) {
+				/* TODO: error !! */
+			}
+			ip_prov[prov_idx].local_ip := ns_config.nsvc[idx].provider.ip.local_ip;
+			ip_prov[prov_idx].local_udp_port := ns_config.nsvc[idx].provider.ip.local_udp_port;
+			ip_prov[prov_idx].vc_NSP_IP := NS_Provider_IPL4_CT.create(id & "-provIP" & int2str(prov_idx));
+			connect(self:NSPIP_PROC, ip_prov[prov_idx].vc_NSP_IP:PROC);
+			ip_prov[prov_idx].vc_NSP_IP.start(NS_Provider_IPL4.main(ns_config.nsvc[idx], ns_config, id));
+		}
+		var integer port_idx := f_nspip_add_nsvc2(ip_prov[prov_idx].vc_NSP_IP, ns_config.nsvc[idx].provider.ip.remote_ip, ns_config.nsvc[idx].provider.ip.remote_udp_port);
+		connect(self:NSCP[idx], ip_prov[prov_idx].vc_NSP_IP:NSVC[port_idx]);
+		/* the NS_PROV_LINK_STATUS_UP is not sent by the NS_Provider_IPL4 because we connect the port manual */
 #ifdef NS_EMULATION_FR
 	} else if (ischosen(ns_config.nsvc[idx].provider.fr)) {
 		vc_NSP_FR[idx] := NS_Provider_FR_CT.create(id & "-provFR");
 		connect(self:NSCP[idx], vc_NSP_FR[idx]:NSE);
 		vc_NSP_FR[idx].start(NS_Provider_FR.main(ns_config.nsvc[idx], ns_config, id));
+		NSCP[idx].receive(NS_Provider_Evt:{link_status:=NS_PROV_LINK_STATUS_UP});
 #endif
 	} else {
 		Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Unsupported NS provider");
 	}
-
-	NSCP[idx].receive(NS_Provider_Evt:{link_status:=NS_PROV_LINK_STATUS_UP});
 }
 
 function f_clean_ns_codec() runs on RAW_NS_CT {
-	for (var integer i := 0; i < lengthof(vc_NSP_IP); i := i + 1) {
-		vc_NSP_IP[i].stop;
+	for (var integer i := 0; i < lengthof(ip_prov); i := i + 1) {
+		if (ip_prov[i].vc_NSP_IP != null) {
+			ip_prov[i].vc_NSP_IP.stop;
+		}
 	}
 #ifdef NS_EMULATION_FR
 	for (var integer i := 0; i < lengthof(vc_NSP_FR); i := i + 1) {
diff --git a/ns/gen_links.sh b/ns/gen_links.sh
index 6ebee9d18..42e5547d8 100755
--- a/ns/gen_links.sh
+++ b/ns/gen_links.sh
@@ -52,7 +52,7 @@ gen_links $DIR $FILES
 DIR=../library
 FILES="Misc_Helpers.ttcn General_Types.ttcn Osmocom_VTY_Functions.ttcn Native_Functions.ttcn Native_FunctionDefs.cc GSM_Types.ttcn GSM_RR_Types.ttcn Osmocom_Types.ttcn RLCMAC_Templates.ttcn RLCMAC_Types.ttcn RLCMAC_CSN1_Templates.ttcn RLCMAC_CSN1_Types.ttcn RLCMAC_EncDec.cc "
 FILES+="StatsD_Types.ttcn StatsD_CodecPort.ttcn StatsD_CodecPort_CtrlFunct.ttcn StatsD_CodecPort_CtrlFunctdef.cc StatsD_Checker.ttcn "
-FILES+="NS_Provider_IPL4.ttcn NS_Provider_FR.ttcn NS_Emulation.ttcnpp "
+FILES+="RAW_NS.ttcnpp NS_Provider_IPL4.ttcn NS_Provider_FR.ttcn NS_Emulation.ttcnpp "
 FILES+="BSSGP_Emulation.ttcnpp Osmocom_Gb_Types.ttcn "
 FILES+="LLC_Templates.ttcn L3_Templates.ttcn L3_Common.ttcn "
 FILES+="PCUIF_Types.ttcn PCUIF_CodecPort.ttcn RAW_NS.ttcnpp "
diff --git a/pcu/gen_links.sh b/pcu/gen_links.sh
index 98a9ff36a..d0f3acecf 100755
--- a/pcu/gen_links.sh
+++ b/pcu/gen_links.sh
@@ -51,7 +51,7 @@ gen_links $DIR $FILES
 DIR=../library
 FILES="Misc_Helpers.ttcn General_Types.ttcn Osmocom_VTY_Functions.ttcn Native_Functions.ttcn Native_FunctionDefs.cc GSM_Types.ttcn GSM_RR_Types.ttcn Osmocom_Types.ttcn RLCMAC_Templates.ttcn RLCMAC_Types.ttcn RLCMAC_CSN1_Templates.ttcn RLCMAC_CSN1_Types.ttcn RLCMAC_EncDec.cc "
 FILES+="StatsD_Types.ttcn StatsD_CodecPort.ttcn StatsD_CodecPort_CtrlFunct.ttcn StatsD_CodecPort_CtrlFunctdef.cc StatsD_Checker.ttcn "
-FILES+="NS_Provider_IPL4.ttcn NS_Emulation.ttcnpp "
+FILES+="RAW_NS.ttcnpp NS_Provider_IPL4.ttcn NS_Emulation.ttcnpp "
 FILES+="BSSGP_Emulation.ttcnpp Osmocom_Gb_Types.ttcn "
 FILES+="LLC_Templates.ttcn L3_Templates.ttcn L3_Common.ttcn "
 FILES+="PCUIF_Types.ttcn PCUIF_CodecPort.ttcn RAW_NS.ttcnpp "
diff --git a/sgsn/gen_links.sh b/sgsn/gen_links.sh
index 8cffa1725..510b449e9 100755
--- a/sgsn/gen_links.sh
+++ b/sgsn/gen_links.sh
@@ -84,7 +84,7 @@ gen_links $DIR $FILES
 
 DIR=../library
 FILES="Misc_Helpers.ttcn General_Types.ttcn GSM_Types.ttcn GSM_RR_Types.ttcn Osmocom_Types.ttcn RLCMAC_Templates.ttcn RLCMAC_Types.ttcn RLCMAC_CSN1_Templates.ttcn RLCMAC_CSN1_Types.ttcn RLCMAC_EncDec.cc "
-FILES+="NS_Provider_IPL4.ttcn NS_Emulation.ttcnpp PCUIF_Types.ttcn "
+FILES+="RAW_NS.ttcnpp NS_Provider_IPL4.ttcn NS_Emulation.ttcnpp PCUIF_Types.ttcn "
 FILES+="BSSGP_Emulation.ttcnpp Osmocom_Gb_Types.ttcn "
 FILES+="Osmocom_CTRL_Types.ttcn Osmocom_CTRL_Functions.ttcn Osmocom_CTRL_Adapter.ttcn "
 FILES+="Osmocom_VTY_Functions.ttcn "