diff --git a/ggsn_tests/GTP_CodecPort.ttcn b/ggsn_tests/GTP_CodecPort.ttcn
index 44c71e252..e610a0f46 100644
--- a/ggsn_tests/GTP_CodecPort.ttcn
+++ b/ggsn_tests/GTP_CodecPort.ttcn
@@ -1,16 +1,16 @@
-/* Translation Port sitting on top of IPL4_asp UDP to encode/decode GTP */
+/* Translation Port sitting on top of UDP_asp UDP to encode/decode GTP */
 /* (C) 2017 by Harald Welte <laforge@gnumonks.org */
 module GTP_CodecPort {
-	import from IPL4asp_PortType all;
-	import from IPL4asp_Types all;
+	import from UDPasp_PortType all;
+	import from UDPasp_Types all;
 	import from GTPC_Types all;
 	import from GTPU_Types all;
 
 	/* identifies a remote peer (sender or receiver) */
 	type record GtpPeer {
-		ConnectionId	connId,
-		HostName	remName,
-		PortNumber	remPort
+		integer		connId,
+		AddressType	remName,
+		PortType	remPort
 	}
 
 	/* Decoded GTP1C (Control Plane), used in send and receive direction */
@@ -25,60 +25,58 @@ module GTP_CodecPort {
 		PDU_GTPU	gtpu
 	}
 
- 	/* Translation port on top of IPL4asp; ASP_Event passed through transparently */
-	type port GTPC_PT message map to IPL4asp_PT {
-		out	Gtp1cUnitdata to ASP_SendTo with f_enc_Gtp1cUD();
-		in	Gtp1cUnitdata from ASP_RecvFrom with f_dec_Gtp1cUD(),
-			ASP_Event;
+ 	/* Translation port on top of UDPasp; ASP_Event passed through transparently */
+	type port GTPC_PT message map to UDPasp_PT {
+		out	Gtp1cUnitdata to ASP_UDP_message with f_enc_Gtp1cUD(),
+			ASP_UDP_open,
+			ASP_UDP_close;
+		in	Gtp1cUnitdata from ASP_UDP_message with f_dec_Gtp1cUD(),
+			ASP_UDP_open_result;
+		inout	ASP_UDP;
 		/* we can declare variables here and use them from all functions with "port" label */
 	}
 
-	function f_enc_Gtp1cUD(in Gtp1cUnitdata in_ud, out ASP_SendTo out_ud) port GTPC_PT {
-		out_ud.connId := in_ud.peer.connId;
-		out_ud.remName := in_ud.peer.remName;
-		out_ud.remPort := in_ud.peer.remPort;
-		out_ud.proto := { udp := {} };
-		out_ud.msg := enc_PDU_GTPC(in_ud.gtpc);
+	function f_enc_Gtp1cUD(in Gtp1cUnitdata in_ud, out ASP_UDP_message out_ud) port GTPC_PT {
+		out_ud.id := in_ud.peer.connId;
+		out_ud.remote_addr := in_ud.peer.remName;
+		out_ud.remote_port := in_ud.peer.remPort;
+		out_ud.data := enc_PDU_GTPC(in_ud.gtpc);
 		port.setstate(0);
 	} with { extension "prototype(fast)" };
 
-	function f_dec_Gtp1cUD(in ASP_RecvFrom in_ud, out Gtp1cUnitdata out_ud) port GTPC_PT {
-		out_ud.peer.connId := in_ud.connId;
-		out_ud.peer.remName := in_ud.remName;
-		out_ud.peer.remPort := in_ud.remPort;
-		out_ud.gtpc := dec_PDU_GTPC(in_ud.msg);
+	function f_dec_Gtp1cUD(in ASP_UDP_message in_ud, out Gtp1cUnitdata out_ud) port GTPC_PT {
+		out_ud.peer.connId := in_ud.id;
+		out_ud.peer.remName := in_ud.remote_addr;
+		out_ud.peer.remPort := in_ud.remote_port;
+		out_ud.gtpc := dec_PDU_GTPC(in_ud.data);
 		port.setstate(0);
 	} with { extension "prototype(fast)" };
 
 
-	/* Translation port on top of IPL4asp; ASP_Event passed through transparently */
-	type port GTPU_PT message map to IPL4asp_PT {
-		out	Gtp1uUnitdata to ASP_SendTo with f_enc_Gtp1uUD();
-		in	Gtp1uUnitdata from ASP_RecvFrom with f_dec_Gtp1uUD(),
-			ASP_Event;
+	/* Translation port on top of UDPasp; ASP_Event passed through transparently */
+	type port GTPU_PT message map to UDPasp_PT {
+		out	Gtp1uUnitdata to ASP_UDP_message with f_enc_Gtp1uUD(),
+			ASP_UDP_open,
+			ASP_UDP_close;
+		in	Gtp1uUnitdata from ASP_UDP_message with f_dec_Gtp1uUD(),
+			ASP_UDP_open_result;
+		inout	ASP_UDP;
 		/* we can declare variables here and use them from all functions with "port" label */
 	}
 
-	function f_enc_Gtp1uUD(in Gtp1uUnitdata in_ud, out ASP_SendTo out_ud) port GTPU_PT {
-		out_ud.connId := in_ud.peer.connId;
-		out_ud.remName := in_ud.peer.remName;
-		out_ud.remPort := in_ud.peer.remPort;
-		out_ud.proto := { udp := {} };
-		out_ud.msg := enc_PDU_GTPU(in_ud.gtpu);
+	function f_enc_Gtp1uUD(in Gtp1uUnitdata in_ud, out ASP_UDP_message out_ud) port GTPU_PT {
+		out_ud.id := in_ud.peer.connId;
+		out_ud.remote_addr := in_ud.peer.remName;
+		out_ud.remote_port := in_ud.peer.remPort;
+		out_ud.data := enc_PDU_GTPU(in_ud.gtpu);
 		port.setstate(0);
 	} with { extension "prototype(fast)" };
 
-	function f_dec_Gtp1uUD(in ASP_RecvFrom in_ud, out Gtp1uUnitdata out_ud) port GTPU_PT {
-		out_ud.peer.connId := in_ud.connId;
-		out_ud.peer.remName := in_ud.remName;
-		out_ud.peer.remPort := in_ud.remPort;
-		out_ud.gtpu := dec_PDU_GTPU(in_ud.msg);
+	function f_dec_Gtp1uUD(in ASP_UDP_message in_ud, out Gtp1uUnitdata out_ud) port GTPU_PT {
+		out_ud.peer.connId := in_ud.id;
+		out_ud.peer.remName := in_ud.remote_addr;
+		out_ud.peer.remPort := in_ud.remote_port;
+		out_ud.gtpu := dec_PDU_GTPU(in_ud.data);
 		port.setstate(0);
 	} with { extension "prototype(fast)" };
-/*
-	function f_GTPC_listen(inout GTPC_PT portRef, in HostName locName,
-				in PortNumber locPort) return Result { 
-		return f_IPL4_listen(portRef, locName, locPort, { udp := {} });
-	}
-*/
 }
diff --git a/ggsn_tests/GTP_CodecPort_CtrlFunct.ttcn b/ggsn_tests/GTP_CodecPort_CtrlFunct.ttcn
deleted file mode 100644
index 33a2cabf7..000000000
--- a/ggsn_tests/GTP_CodecPort_CtrlFunct.ttcn
+++ /dev/null
@@ -1,43 +0,0 @@
-module GTP_CodecPort_CtrlFunct {
-
-  import from GTP_CodecPort all;
-  import from IPL4asp_Types all;
-
-  external function f_IPL4_listen(
-    inout GTPC_PT portRef,
-    in HostName locName,
-    in PortNumber locPort,
-    in ProtoTuple proto,
-    in OptionList options := {}
-  ) return Result;
-
-  external function f_IPL4_connect(
-    inout GTPC_PT portRef,
-    in HostName remName,
-    in PortNumber remPort,
-    in HostName locName,
-    in PortNumber locPort,
-    in ConnectionId connId,
-    in ProtoTuple proto,
-    in OptionList options := {}
-  ) return Result;
-
-  external function f_IPL4_close(
-    inout GTPC_PT portRef,
-    in ConnectionId id,
-    in ProtoTuple proto := { unspecified := {} }
-  ) return Result;
-
-  external function f_IPL4_setUserData(
-    inout GTPC_PT portRef,
-    in ConnectionId id,
-    in UserData userData
-  ) return Result;
-
-  external function f_IPL4_getUserData(
-    inout GTPC_PT portRef,
-    in ConnectionId id,
-    out UserData userData
-  ) return Result;
-
-}
diff --git a/ggsn_tests/GTP_CodecPort_CtrlFunctDef.cc b/ggsn_tests/GTP_CodecPort_CtrlFunctDef.cc
deleted file mode 100644
index a8a014b64..000000000
--- a/ggsn_tests/GTP_CodecPort_CtrlFunctDef.cc
+++ /dev/null
@@ -1,58 +0,0 @@
-#include "IPL4asp_PortType.hh"
-#include "IPL4asp_PT.hh"
-#include "GTP_CodecPort.hh"
-
-using namespace IPL4asp__PortType;
-using namespace IPL4asp__Types;
-
-namespace GTP__CodecPort__CtrlFunct {
-
-  IPL4asp__Types::Result f__IPL4__listen(
-    GTP__CodecPort::GTPC__PT& portRef,
-    const IPL4asp__Types::HostName& locName,
-    const IPL4asp__Types::PortNumber& locPort,
-    const IPL4asp__Types::ProtoTuple& proto,
-    const IPL4asp__Types::OptionList& options)
-  {
-    return f__IPL4__PROVIDER__listen(portRef, locName, locPort, proto, options);
-  }
-  
-  IPL4asp__Types::Result f__IPL4__connect(
-    GTP__CodecPort::GTPC__PT& portRef,
-    const IPL4asp__Types::HostName& remName,
-    const IPL4asp__Types::PortNumber& remPort,
-    const IPL4asp__Types::HostName& locName,
-    const IPL4asp__Types::PortNumber& locPort,
-    const IPL4asp__Types::ConnectionId& connId,
-    const IPL4asp__Types::ProtoTuple& proto,
-    const IPL4asp__Types::OptionList& options)
-  {
-    return f__IPL4__PROVIDER__connect(portRef, remName, remPort,
-                                      locName, locPort, connId, proto, options);
-  }
-
-  IPL4asp__Types::Result f__IPL4__close(
-    GTP__CodecPort::GTPC__PT& portRef, 
-    const IPL4asp__Types::ConnectionId& connId, 
-    const IPL4asp__Types::ProtoTuple& proto)
-  {
-      return f__IPL4__PROVIDER__close(portRef, connId, proto);
-  }
-
-  IPL4asp__Types::Result f__IPL4__setUserData(
-    GTP__CodecPort::GTPC__PT& portRef,
-    const IPL4asp__Types::ConnectionId& connId,
-    const IPL4asp__Types::UserData& userData)
-  {
-    return f__IPL4__PROVIDER__setUserData(portRef, connId, userData);
-  }
-  
-  IPL4asp__Types::Result f__IPL4__getUserData(
-    GTP__CodecPort::GTPC__PT& portRef,
-    const IPL4asp__Types::ConnectionId& connId,
-    IPL4asp__Types::UserData& userData)
-  {
-    return f__IPL4__PROVIDER__getUserData(portRef, connId, userData);
-  }
-  
-}
diff --git a/ggsn_tests/gen_links.sh b/ggsn_tests/gen_links.sh
index 7d2b013e2..abbe534d1 100755
--- a/ggsn_tests/gen_links.sh
+++ b/ggsn_tests/gen_links.sh
@@ -23,8 +23,8 @@ DIR=$BASEDIR/titan.TestPorts.Common_Components.Socket-API/src
 FILES="Socket_API_Definitions.ttcn"
 gen_links $DIR $FILES
 
-DIR=$BASEDIR/titan.TestPorts.IPL4asp/src
-FILES="IPL4asp_Functions.ttcn  IPL4asp_PT.cc  IPL4asp_PT.hh IPL4asp_PortType.ttcn  IPL4asp_Types.ttcn  IPL4asp_discovery.cc IPL4asp_protocol_L234.hh"
+DIR=$BASEDIR/titan.TestPorts.UDPasp/src
+FILES="UDPasp_PT.cc  UDPasp_PT.hh  UDPasp_PortType.ttcn  UDPasp_Types.ttcn"
 gen_links $DIR $FILES
 
 DIR=../GTP_v13.5.0_CNL113843_LATEST/src
diff --git a/ggsn_tests/regen_makefile.sh b/ggsn_tests/regen_makefile.sh
index 266887339..9939016d1 100755
--- a/ggsn_tests/regen_makefile.sh
+++ b/ggsn_tests/regen_makefile.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-FILES="*.ttcn IPL4asp_PT.cc  IPL4asp_discovery.cc  TCCConversion.cc  TCCInterface.cc GTPC_EncDec.cc GTPU_EncDec.cc GTP_CodecPort_CtrlFunctDef.cc GTPC_PT.cc GTPU_PT.cc"
+FILES="*.ttcn  UDPasp_PT.cc  TCCConversion.cc  TCCInterface.cc GTPC_EncDec.cc GTPU_EncDec.cc GTPC_PT.cc GTPU_PT.cc"
 
 ttcn3_makefilegen -f GGSN_Tests.ttcn $FILES
 sed -i -e 's/# TTCN3_DIR = /TTCN3_DIR = \/usr/' Makefile