diff --git a/Makefile b/Makefile
index 05670817f..f05ab482b 100644
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,7 @@ SUBDIRS= \
 	gbproxy \
 	ggsn_tests \
 	hlr \
+	hnodeb \
 	mgw \
 	mme \
 	msc \
diff --git a/hnodeb/HNBGW_ConnectionHandler.ttcn b/hnodeb/HNBGW_ConnectionHandler.ttcn
new file mode 100644
index 000000000..071e3e8a1
--- /dev/null
+++ b/hnodeb/HNBGW_ConnectionHandler.ttcn
@@ -0,0 +1,112 @@
+module HNBGW_ConnectionHandler {
+
+/* HNBGW Connection Handler of HNB_Tests in TTCN-3
+ * (C) 2021 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+import from Misc_Helpers all;
+import from General_Types all;
+import from Osmocom_Types all;
+import from IPL4asp_Types all;
+import from Native_Functions all;
+
+import from SDP_Types all;
+
+import from StatsD_Checker all;
+
+import from TELNETasp_PortType all;
+import from Osmocom_VTY_Functions all;
+
+import from HNBAP_Templates all;
+
+import from Iuh_Emulation all;
+
+/* this component represents a single Iuh connection at the HNBGW. */
+type component HNBGW_ConnHdlr extends StatsD_ConnHdlr {
+	port TELNETasp_PT HNBVTY;
+	port HNBAP_PT HNBAP;
+	port RUA_PT RUA;
+	var TestHdlrParams g_pars;
+
+	var boolean g_vty_initialized := false;
+}
+
+function f_HNBGW_ConnHdlr_init_vty() runs on HNBGW_ConnHdlr {
+	if (not g_vty_initialized) {
+		map(self:HNBVTY, system:HNBVTY);
+		f_vty_set_prompts(HNBVTY);
+		f_vty_transceive(HNBVTY, "enable");
+		g_vty_initialized := true;
+	}
+}
+
+/* initialize all parameters */
+function f_HNBGW_ConnHdlr_init(TestHdlrParams pars) runs on HNBGW_ConnHdlr {
+	var integer i := 0;
+	var Iuh_Emulation_CT vc_Iuh;
+
+	g_pars := valueof(pars);
+	vc_Iuh := Iuh_Emulation_CT.create("HNBGW" & int2str(i));
+	connect(self:HNBAP, vc_Iuh:HNBAP);
+	connect(self:RUA, vc_Iuh:RUA);
+
+	var Iuh_conn_parameters iuh_pars;
+	iuh_pars.remote_ip := g_pars.hnodeb_addr;
+	iuh_pars.remote_sctp_port := -1;
+	iuh_pars.local_ip := g_pars.hnbgw_addr;
+	iuh_pars.local_sctp_port  := g_pars.hnbgw_port;
+	vc_Iuh.start(Iuh_Emulation.main(iuh_pars, "Iuh" & int2str(i)));
+
+	f_HNBGW_ConnHdlr_init_vty();
+}
+
+type record TestHdlrParams {
+	charstring hnbgw_addr,
+	charstring hnodeb_addr,
+	integer hnbgw_port,
+	uint16_t rnc_id,
+	charstring hNB_Identity_Info,
+	OCT3 plmnid,
+	uint32_t cell_identity,
+	uint16_t lac,
+	uint8_t rac,
+	uint8_t sac
+};
+
+/* Note: Do not use valueof() to get a value of this template, use
+ * f_gen_test_hdlr_pars() instead in order to get a configuration. */
+template (value) TestHdlrParams t_def_TestHdlrPars := {
+	hnbgw_addr := "127.0.0.1",
+	hnodeb_addr := "127.0.0.1",
+	hnbgw_port := 29169,
+	rnc_id := 23,
+	hNB_Identity_Info := "OsmoHNodeB",
+	plmnid := '00F110'O,
+	cell_identity := 1,
+	lac := 2,
+	rac := 3,
+	sac := 4
+}
+
+
+function f_handle_hnbap_hnb_register_req()
+runs on HNBGW_ConnHdlr {
+	HNBAP.receive(tr_HNBAP_HNBRegisterRequest(char2oct(g_pars.hNB_Identity_Info),
+						  g_pars.plmnid,
+						  int2bit(g_pars.cell_identity, 28),
+						  int2oct(g_pars.lac, 2),
+						  int2oct(g_pars.rac, 1),
+						  int2oct(g_pars.sac, 2)
+						 ));
+	HNBAP.send(ts_HNBAP_HNBRegisterAccept(g_pars.rnc_id));
+}
+
+
+
+}
diff --git a/hnodeb/HNB_Tests.cfg b/hnodeb/HNB_Tests.cfg
new file mode 100644
index 000000000..38d9cc7c1
--- /dev/null
+++ b/hnodeb/HNB_Tests.cfg
@@ -0,0 +1,18 @@
+[ORDERED_INCLUDE]
+# Common configuration, shared between test suites
+"../Common.cfg"
+# testsuite specific configuration, not expected to change
+"./HNB_Tests.default"
+
+# Local configuration below
+
+[LOGGING]
+
+[TESTPORT_PARAMETERS]
+
+[MODULE_PARAMETERS]
+
+[MAIN_CONTROLLER]
+
+[EXECUTE]
+HNB_Tests.control
diff --git a/hnodeb/HNB_Tests.default b/hnodeb/HNB_Tests.default
new file mode 100644
index 000000000..a06dcc67c
--- /dev/null
+++ b/hnodeb/HNB_Tests.default
@@ -0,0 +1,27 @@
+[LOGGING]
+mtc.FileMask := LOG_ALL | TTCN_DEBUG | TTCN_MATCHING | DEBUG_ENCDEC;
+
+[TESTPORT_PARAMETERS]
+*.HNBVTY.CTRL_MODE := "client"
+*.HNBVTY.CTRL_HOSTNAME := "127.0.0.1"
+*.HNBVTY.CTRL_PORTNUM := "4273"
+*.HNBVTY.CTRL_LOGIN_SKIPPED := "yes"
+*.HNBVTY.CTRL_DETECT_SERVER_DISCONNECTED := "yes"
+*.HNBVTY.CTRL_READMODE := "buffered"
+*.HNBVTY.CTRL_CLIENT_CLEANUP_LINEFEED := "yes"
+*.HNBVTY.CTRL_DETECT_CONNECTION_ESTABLISHMENT_RESULT := "yes"
+*.HNBVTY.PROMPT1 := "OsmoHNodeB> "
+*.STATSVTY.CTRL_MODE := "client"
+*.STATSVTY.CTRL_HOSTNAME := "127.0.0.1"
+*.STATSVTY.CTRL_PORTNUM := "4274"
+*.STATSVTY.CTRL_LOGIN_SKIPPED := "yes"
+*.STATSVTY.CTRL_DETECT_SERVER_DISCONNECTED := "yes"
+*.STATSVTY.CTRL_READMODE := "buffered"
+*.STATSVTY.CTRL_CLIENT_CLEANUP_LINEFEED := "yes"
+*.STATSVTY.CTRL_DETECT_CONNECTION_ESTABLISHMENT_RESULT := "yes"
+*.STATSVTY.PROMPT1 := "OsmoHNodeB> "
+
+[MODULE_PARAMETERS]
+Osmocom_VTY_Functions.mp_prompt_prefix := "OsmoHNodeB";
+
+[EXECUTE]
diff --git a/hnodeb/HNB_Tests.ttcn b/hnodeb/HNB_Tests.ttcn
new file mode 100644
index 000000000..7a668dde0
--- /dev/null
+++ b/hnodeb/HNB_Tests.ttcn
@@ -0,0 +1,214 @@
+module HNB_Tests {
+
+/* Integration Tests for OsmoHNodeB
+ * (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This test suite tests OsmoHNodB while emulating both multiple UE as
+ * well as the HNBGW. See README for more details.
+ *
+ * There are test cases that run in so-called 'handler mode' and test cases
+ * that run directly on top of the BSSAP and RSL CodecPorts.  The "handler mode"
+ * tests abstract the multiplexing/demultiplexing of multiple SCCP connections
+ * and/or RSL channels and are hence suitable for higher-level test cases, while
+ * the "raw" tests directly on top of the CodecPorts are more suitable for lower-
+ * level testing.
+ */
+
+import from Misc_Helpers all;
+import from General_Types all;
+import from Osmocom_Types all;
+import from IPL4asp_Types all;
+
+import from Osmocom_CTRL_Functions all;
+import from Osmocom_CTRL_Types all;
+import from Osmocom_CTRL_Adapter all;
+
+import from StatsD_Types all;
+import from StatsD_CodecPort all;
+import from StatsD_CodecPort_CtrlFunct all;
+import from StatsD_Checker all;
+
+import from Osmocom_VTY_Functions all;
+import from TELNETasp_PortType all;
+
+import from HNBAP_Templates all;
+
+import from HNBGW_ConnectionHandler all;
+import from Iuh_Emulation all;
+
+modulepar {
+	/* IP address at which the HNodeB can be reached */
+	charstring mp_hnodeb_ip := "127.0.0.1";
+
+	/* IP address at which the test binds */
+	charstring mp_hnbgw_iuh_ip := "127.0.0.1";
+	integer mp_hnbgw_iuh_port := 29169;
+}
+
+type component test_CT extends CTRL_Adapter_CT {
+	port TELNETasp_PT HNBVTY;
+
+	/* global test case guard timer (actual timeout value is set in f_init()) */
+	timer T_guard := 30.0;
+}
+
+/* global altstep for global guard timer; */
+altstep as_Tguard() runs on test_CT {
+	[] T_guard.timeout {
+			setverdict(fail, "Timeout of T_guard");
+			mtc.stop;
+		}
+}
+
+friend function f_logp(TELNETasp_PT pt, charstring log_msg)
+{
+	// log on TTCN3 log output
+	log(log_msg);
+	// log in stderr log
+	f_vty_transceive(pt, "logp lglobal notice TTCN3 f_logp(): " & log_msg);
+}
+
+function f_init_vty(charstring id := "foo") runs on test_CT {
+	if (HNBVTY.checkstate("Mapped")) {
+		/* skip initialization if already executed once */
+		return;
+	}
+	map(self:HNBVTY, system:HNBVTY);
+	f_vty_set_prompts(HNBVTY);
+	f_vty_transceive(HNBVTY, "enable");
+}
+/* global initialization function */
+function f_init(float guard_timeout := 30.0) runs on test_CT {
+	var integer bssap_idx;
+
+	T_guard.start(guard_timeout);
+	activate(as_Tguard());
+
+	f_init_vty("VirtHNBGW");
+
+	/* TODO: Wait for Iuh connection to be established */
+}
+
+friend function f_shutdown_helper() runs on test_CT {
+	all component.stop;
+	setverdict(pass);
+	mtc.stop;
+}
+
+friend function f_gen_test_hdlr_pars() return TestHdlrParams {
+
+	var TestHdlrParams pars := valueof(t_def_TestHdlrPars);
+	pars.hnodeb_addr := mp_hnodeb_ip;
+	pars.hnbgw_addr := mp_hnbgw_iuh_ip;
+	pars.hnbgw_port := mp_hnbgw_iuh_port;
+	return pars;
+}
+
+type function void_fn(charstring id) runs on HNBGW_ConnHdlr;
+
+/* helper function to create and connect a HNBGW_ConnHdlr component */
+private function f_connect_handler(inout HNBGW_ConnHdlr vc_conn, integer bssap_idx := 0) runs on test_CT {
+	/*connect(vc_conn:RAN, g_bssap[bssap_idx].vc_RAN:PROC);
+	connect(vc_conn:MGCP_PROC, vc_MGCP:MGCP_PROC);
+	connect(vc_conn:RSL, bts[0].rsl.vc_RSL:CLIENT_PT);
+	connect(vc_conn:RSL_PROC, bts[0].rsl.vc_RSL:RSL_PROC);
+	if (isvalue(bts[1])) {
+		connect(vc_conn:RSL1, bts[1].rsl.vc_RSL:CLIENT_PT);
+		connect(vc_conn:RSL1_PROC, bts[1].rsl.vc_RSL:RSL_PROC);
+	}
+	if (isvalue(bts[2])) {
+		connect(vc_conn:RSL2, bts[2].rsl.vc_RSL:CLIENT_PT);
+		connect(vc_conn:RSL2_PROC, bts[2].rsl.vc_RSL:RSL_PROC);
+	}
+	connect(vc_conn:BSSAP, g_bssap[bssap_idx].vc_RAN:CLIENT);
+	if (mp_enable_lcs_tests) {
+		connect(vc_conn:BSSAP_LE, g_bssap_le.vc_BSSAP_LE:CLIENT);
+		connect(vc_conn:BSSAP_LE_PROC, g_bssap_le.vc_BSSAP_LE:PROC);
+	}
+	connect(vc_conn:MGCP, vc_MGCP:MGCP_CLIENT);
+	connect(vc_conn:MGCP_MULTI, vc_MGCP:MGCP_CLIENT_MULTI);
+	connect(vc_conn:STATSD_PROC, vc_STATSD:STATSD_PROC);*/
+}
+
+function f_start_handler_create(TestHdlrParams pars)
+runs on test_CT return HNBGW_ConnHdlr {
+	var charstring id := testcasename();
+	var HNBGW_ConnHdlr vc_conn;
+	vc_conn := HNBGW_ConnHdlr.create(id);
+	f_connect_handler(vc_conn);
+	return vc_conn;
+}
+
+function f_start_handler_run(HNBGW_ConnHdlr vc_conn, void_fn fn, TestHdlrParams pars)
+runs on test_CT return HNBGW_ConnHdlr {
+	var charstring id := testcasename();
+	/* Emit a marker to appear in the SUT's own logging output */
+	f_logp(HNBVTY, id & "() start");
+	vc_conn.start(f_handler_init(fn, id, pars));
+	return vc_conn;
+}
+
+function f_start_handler(void_fn fn, template (omit) TestHdlrParams pars_tmpl := omit)
+runs on test_CT return HNBGW_ConnHdlr {
+	var TestHdlrParams pars;
+	if (isvalue(pars)) {
+		pars := valueof(pars_tmpl);
+	} else {
+		pars := valueof(f_gen_test_hdlr_pars());
+	}
+	return f_start_handler_run(f_start_handler_create(pars), fn, pars);
+}
+
+/* first function inside ConnHdlr component; sets g_pars + starts function */
+private function f_handler_init(void_fn fn, charstring id, TestHdlrParams pars)
+runs on HNBGW_ConnHdlr {
+	f_HNBGW_ConnHdlr_init(pars);
+	HNBAP.receive(IUHEM_Event:{up_down:=IUHEM_EVENT_UP}); /* Wait for HNB to connect to us */
+	fn.apply(id);
+}
+
+private function f_tc_hnb_register_request(charstring id) runs on HNBGW_ConnHdlr {
+	f_handle_hnbap_hnb_register_req();
+	f_sleep(1.0);
+}
+testcase TC_hnb_register_request_accept() runs on test_CT {
+	var HNBGW_ConnHdlr vc_conn;
+
+	f_init();
+	vc_conn := f_start_handler(refers(f_tc_hnb_register_request));
+	vc_conn.done;
+	f_shutdown_helper();
+}
+
+private function f_tc_hnb_register_reject(charstring id) runs on HNBGW_ConnHdlr {
+	HNBAP.receive(tr_HNBAP_HNBRegisterRequest(char2oct(g_pars.hNB_Identity_Info),
+						  g_pars.plmnid,
+						  int2bit(g_pars.cell_identity, 28),
+						  int2oct(g_pars.lac, 2),
+						  int2oct(g_pars.rac, 1),
+						  int2oct(g_pars.sac, 2)
+						 ));
+	HNBAP.send(ts_HNBAP_HNBRegisterReject(ts_HnbapCause(overload)));
+	f_sleep(1.0);
+}
+testcase TC_hnb_register_request_reject() runs on test_CT {
+	var HNBGW_ConnHdlr vc_conn;
+
+	f_init();
+	vc_conn := f_start_handler(refers(f_tc_hnb_register_reject));
+	vc_conn.done;
+	f_shutdown_helper();
+}
+
+control {
+	execute( TC_hnb_register_request_accept() );
+	execute( TC_hnb_register_request_reject() );
+}
+
+}
diff --git a/hnodeb/README.md b/hnodeb/README.md
new file mode 100644
index 000000000..3b3fa9fba
--- /dev/null
+++ b/hnodeb/README.md
@@ -0,0 +1,30 @@
+# HNB_Tests.ttcn
+
+* external interfaces
+    * Iuh side (emulates HNBGW-side)
+        * SCTP/HNBAP
+        * SCTP/RUA/RANAP
+    * RTP side: emulates MGW
+    * GTP-U side: emulates GGSN
+    * UE side
+    * VTY
+    * CTRL
+    * StatsD
+
+{% dot hnb_tests.svg
+digraph G {
+  graph [label="HNB_Tests", labelloc=t, fontsize=30];
+  rankdir=LR;
+  { rank=same; ATS; HNB; };
+  HNB [label="IUT\nosmo-bsc",shape="box"];
+  ATS [label="ATS\nHNB_Tests.ttcn"];
+
+  HNB <- ATS [label="Uu (or some intermediate lower layer)"];
+  HNB -> ATS [label="Iuh"];
+  HNB -> ATS [label="RTP"];
+  HNB -> ATS [label="GTP-U"];
+  HNB <- ATS [label="CTRL"];
+  HNB <- ATS [label="VTY"];
+  HNB -> ATS [label="StatsD"];
+}
+%}
diff --git a/hnodeb/README.txt b/hnodeb/README.txt
new file mode 100644
index 000000000..1cf81ee0c
--- /dev/null
+++ b/hnodeb/README.txt
@@ -0,0 +1,32 @@
+Integration Tests for OsmoHnodeB
+--------------------------------
+
+This test suite tests OsmoHNodeB while emulating both multiple UE as
+well as the HNBGW.
+
+The included jenkins.sh script, together with the Dockerfiles from
+http://git.osmocom.org/docker-playground/ can be used to run both the
+osmo-hnodeb-under-test as well as the extenal entities and the tester.
+
+
+Further Test Ideas
+------------------
+
+This is a random list of things about things possible to test.
+Asterisks '*' are TODO, while 'x' means already implemented.
+
+= exhaustion of resources
+
+= paging
+
+= assignment
+
+= hand-over
+
+= erroneous channel release
+
+= misc
+
+= counters
+
+= VTY based/corresponding tests
diff --git a/hnodeb/expected-results.xml b/hnodeb/expected-results.xml
new file mode 100644
index 000000000..39cea9feb
--- /dev/null
+++ b/hnodeb/expected-results.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0"?>
+<testsuite name='HNB_Tests' tests='0' failures='0' errors='0' skipped='0' inconc='0' time='MASKED'>
+
+</testsuite>
diff --git a/hnodeb/gen_links.sh b/hnodeb/gen_links.sh
new file mode 100755
index 000000000..ba946e8c5
--- /dev/null
+++ b/hnodeb/gen_links.sh
@@ -0,0 +1,60 @@
+#!/bin/bash
+
+BASEDIR=../deps
+
+. ../gen_links.sh.inc
+
+#DIR=$BASEDIR/titan.TestPorts.UNIX_DOMAIN_SOCKETasp/src
+#FILES="UD_PT.cc  UD_PT.hh  UD_PortType.ttcn  UD_Types.ttcn"
+#gen_links $DIR $FILES
+
+DIR=$BASEDIR/titan.Libraries.TCCUsefulFunctions/src
+FILES="TCCInterface_Functions.ttcn TCCConversion_Functions.ttcn TCCConversion.cc TCCInterface.cc TCCInterface_ip.h"
+FILES+=" TCCEncoding_Functions.ttcn TCCEncoding.cc " # GSM 7-bit coding
+gen_links $DIR $FILES
+
+DIR=$BASEDIR/titan.TestPorts.Common_Components.Socket-API/src
+FILES="Socket_API_Definitions.ttcn"
+gen_links $DIR $FILES
+
+# Required by MGCP and IPA
+DIR=$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"
+gen_links $DIR $FILES
+
+# required by M3UA_Emulation
+DIR=$BASEDIR/titan.TestPorts.SCTPasp/src
+FILES="SCTPasp_PT.cc  SCTPasp_PT.hh  SCTPasp_PortType.ttcn  SCTPasp_Types.ttcn"
+gen_links $DIR $FILES
+
+DIR=$BASEDIR/titan.ProtocolModules.SDP/src
+FILES="SDP_EncDec.cc SDP_Types.ttcn SDP_parse_.tab.c SDP_parse_.tab.h SDP_parse_parser.h SDP_parser.l
+SDP_parser.y lex.SDP_parse_.c"
+gen_links $DIR $FILES
+
+DIR=$BASEDIR/titan.ProtocolModules.RTP/src
+FILES="RTP_EncDec.cc RTP_Types.ttcn"
+gen_links $DIR $FILES
+
+DIR=$BASEDIR/titan.TestPorts.TELNETasp/src
+FILES="TELNETasp_PT.cc  TELNETasp_PT.hh  TELNETasp_PortType.ttcn"
+gen_links $DIR $FILES
+
+DIR=../library/hnbap
+FILES="HNBAP_CommonDataTypes.asn HNBAP_Constants.asn HNBAP_Containers.asn HNBAP_IEs.asn HNBAP_PDU_Contents.asn HNBAP_PDU_Descriptions.asn "
+FILES+="HNBAP_EncDec.cc  HNBAP_Types.ttcn  HNBAP_Templates.ttcn "
+gen_links $DIR $FILES
+
+DIR=../library/rua
+FILES="RUA_CommonDataTypes.asn RUA_Constants.asn RUA_Containers.asn RUA_IEs.asn RUA_PDU_Contents.asn RUA_PDU_Descriptions.asn "
+FILES+="RUA_EncDec.cc  RUA_Types.ttcn  RUA_Templates.ttcn "
+gen_links $DIR $FILES
+
+DIR=../library
+FILES="Iuh_Types.ttcn Iuh_CodecPort.ttcn Iuh_CodecPort_CtrlFunctDef.cc Iuh_CodecPort_CtrlFunct.ttcn Iuh_Emulation.ttcn DNS_Helpers.ttcn "
+FILES+="Misc_Helpers.ttcn General_Types.ttcn Osmocom_Types.ttcn Osmocom_VTY_Functions.ttcn Native_Functions.ttcn Native_FunctionDefs.cc IPA_Types.ttcn IPA_CodecPort.ttcn IPA_CodecPort_CtrlFunct.ttcn IPA_CodecPort_CtrlFunctDef.cc IPA_Emulation.ttcnpp Osmocom_CTRL_Types.ttcn Osmocom_CTRL_Functions.ttcn Osmocom_CTRL_Adapter.ttcn RTP_CodecPort.ttcn RTP_CodecPort_CtrlFunct.ttcn RTP_CodecPort_CtrlFunctDef.cc RTP_Emulation.ttcn IuUP_Types.ttcn IuUP_EncDec.cc IuUP_Emulation.ttcn "
+FILES+="StatsD_Types.ttcn StatsD_CodecPort.ttcn StatsD_CodecPort_CtrlFunct.ttcn StatsD_CodecPort_CtrlFunctdef.cc StatsD_Checker.ttcn "
+
+gen_links $DIR $FILES
+
+ignore_pp_results
diff --git a/hnodeb/osmo-hnodeb.cfg b/hnodeb/osmo-hnodeb.cfg
new file mode 100644
index 000000000..3ccd4b412
--- /dev/null
+++ b/hnodeb/osmo-hnodeb.cfg
@@ -0,0 +1,19 @@
+log stderr
+ logging filter all 1
+ logging color 1
+ logging print category-hex 0
+ logging print category 1
+ logging print extended-timestamp 1
+ logging print file basename
+ logging level set-all debug
+line vty
+ no login
+!
+hnodeb
+ cell_identity 1
+ location_area_code 2
+ routing_area_code 3
+ service_area_code 4
+ iuh
+  local-ip 127.0.0.1
+  remote-ip 127.0.0.1
diff --git a/hnodeb/regen_makefile.sh b/hnodeb/regen_makefile.sh
new file mode 100755
index 000000000..9ebfaf2f0
--- /dev/null
+++ b/hnodeb/regen_makefile.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+
+NAME=HNB_Tests
+
+FILES="
+	*.asn
+	*.c
+	*.ttcn
+	*.ttcnpp
+	IPA_CodecPort_CtrlFunctDef.cc
+	IPL4asp_PT.cc
+	IPL4asp_discovery.cc
+	IuUP_EncDec.cc
+	Iuh_CodecPort_CtrlFunctDef.cc
+	Native_FunctionDefs.cc
+	RTP_CodecPort_CtrlFunctDef.cc
+	RTP_EncDec.cc
+	SCTPasp_PT.cc
+	SDP_EncDec.cc
+	StatsD_CodecPort_CtrlFunctdef.cc
+	TCCConversion.cc
+	TCCEncoding.cc
+	TCCInterface.cc
+	TELNETasp_PT.cc
+	HNBAP_EncDec.cc
+	RUA_EncDec.cc
+"
+
+export CPPFLAGS_TTCN3="
+	-DIPA_EMULATION_CTRL
+"
+
+../regen-makefile.sh -e $NAME $FILES
+
+sed -i -e 's/^LINUX_LIBS = -lxml2 -lsctp/LINUX_LIBS = -lxml2 -lsctp -lfftranscode/' Makefile
diff --git a/library/Iuh_CodecPort.ttcn b/library/Iuh_CodecPort.ttcn
new file mode 100644
index 000000000..569a27fdd
--- /dev/null
+++ b/library/Iuh_CodecPort.ttcn
@@ -0,0 +1,141 @@
+module Iuh_CodecPort {
+
+/* Simple Iuh Codec Port, translating between raw SCTP primitives with
+ * octetstring payload towards the IPL4asp provider, and Iuh primitives
+ * which carry the decoded Iuh data types as payload.
+ *
+ * (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * Author: Pau Espin Pedrol <pespin@sysmocom.de>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+	import from IPL4asp_PortType all;
+	import from IPL4asp_Types all;
+	import from HNBAP_PDU_Descriptions all;
+	import from HNBAP_Types all;
+	import from RUA_PDU_Descriptions all;
+	import from RUA_Types all;
+	import from Iuh_Types all;
+
+	type record Iuh_RecvFrom {
+		ConnectionId	connId,
+		HostName	remName,
+		PortNumber	remPort,
+		HostName	locName,
+		PortNumber	locPort,
+		Iuh_PDU	msg
+	};
+
+	template Iuh_RecvFrom t_Iuh_RecvFrom(template Iuh_PDU msg) := {
+		connId := ?,
+		remName := ?,
+		remPort := ?,
+		locName := ?,
+		locPort := ?,
+		msg := msg
+	}
+
+	template Iuh_RecvFrom t_Iuh_RecvFrom_HNBAP(template HNBAP_PDU hnbap_msg := ?) := {
+		connId := ?,
+		remName := ?,
+		remPort := ?,
+		locName := ?,
+		locPort := ?,
+		msg := {
+			hnbap := hnbap_msg
+		}
+	}
+
+	template Iuh_RecvFrom t_Iuh_RecvFrom_RUA(template RUA_PDU rua_msg := ?) := {
+		connId := ?,
+		remName := ?,
+		remPort := ?,
+		locName := ?,
+		locPort := ?,
+		msg := {
+			rua := rua_msg
+		}
+	}
+
+	type record Iuh_Send {
+		ConnectionId	connId,
+		Iuh_PDU	msg
+	};
+
+	template Iuh_Send t_Iuh_Send_HNBAP(template ConnectionId connId, template HNBAP_PDU hnbap_msg) := {
+		connId := connId,
+		msg := {
+			hnbap := hnbap_msg
+		}
+	}
+
+	template Iuh_Send t_Iuh_Send_RUA(template ConnectionId connId, template RUA_PDU rua_msg) := {
+		connId := connId,
+		msg := {
+			rua := rua_msg
+		}
+	}
+
+	private function IPL4_to_Iuh_RecvFrom(in ASP_RecvFrom pin, out Iuh_RecvFrom pout) {
+		pout.connId := pin.connId;
+		pout.remName := pin.remName;
+		pout.remPort := pin.remPort;
+		pout.locName := pin.locName;
+		pout.locPort := pin.locPort;
+		select (pin.proto.sctp.sinfo_ppid) {
+			case (19) {
+				pout.msg.rua := dec_RUA_PDU(pin.msg);
+			}
+			case (20) {
+				pout.msg.hnbap := dec_HNBAP_PDU(pin.msg);
+			}
+			case (0) {
+				/* FIXME: lower layers report sinfo_ppid=0: */
+				pout.msg.hnbap := dec_HNBAP_PDU(pin.msg);
+			}
+			case else {
+				pout.msg.payload := pin.msg;
+			}
+		}
+	} with { extension "prototype(fast)" };
+
+	private function Iuh_to_IPL4_Send(in Iuh_Send pin, out ASP_Send pout) {
+		var integer sctp_ppid;
+		if (ischosen(pin.msg.rua)) {
+			sctp_ppid := 19;
+			pout.msg := enc_RUA_PDU(pin.msg.rua);
+		} else if (ischosen(pin.msg.hnbap)) {
+			sctp_ppid := 20;
+			pout.msg := enc_HNBAP_PDU(pin.msg.hnbap);
+		} else { /*TODO: abort?*/
+			sctp_ppid := 0;
+			pout.msg := pin.msg.payload;
+		}
+		pout.connId := pin.connId;
+		pout.proto := {
+			sctp := {
+				sinfo_stream := omit,
+				sinfo_ppid := sctp_ppid,
+				remSocks := omit,
+				assocId := omit
+			}
+		};
+	} with { extension "prototype(fast)" };
+
+	type port Iuh_CODEC_PT message {
+		out	Iuh_Send;
+		in	Iuh_RecvFrom,
+			ASP_ConnId_ReadyToRelease,
+			ASP_Event;
+	} with { extension "user IPL4asp_PT
+		out(Iuh_Send -> ASP_Send:function(Iuh_to_IPL4_Send))
+		in(ASP_RecvFrom -> Iuh_RecvFrom: function(IPL4_to_Iuh_RecvFrom);
+		   ASP_ConnId_ReadyToRelease -> ASP_ConnId_ReadyToRelease: simple;
+		   ASP_Event -> ASP_Event: simple)"
+	}
+}
diff --git a/library/Iuh_CodecPort_CtrlFunct.ttcn b/library/Iuh_CodecPort_CtrlFunct.ttcn
new file mode 100644
index 000000000..c0c7003fe
--- /dev/null
+++ b/library/Iuh_CodecPort_CtrlFunct.ttcn
@@ -0,0 +1,43 @@
+module Iuh_CodecPort_CtrlFunct {
+
+  import from Iuh_CodecPort all;
+  import from IPL4asp_Types all;
+
+  external function f_IPL4_listen(
+    inout Iuh_CODEC_PT portRef,
+    in HostName locName,
+    in PortNumber locPort,
+    in ProtoTuple proto,
+    in OptionList options := {}
+  ) return Result;
+
+  external function f_IPL4_connect(
+    inout Iuh_CODEC_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 Iuh_CODEC_PT portRef,
+    in ConnectionId id,
+    in ProtoTuple proto := { unspecified := {} }
+  ) return Result;
+
+  external function f_IPL4_setUserData(
+    inout Iuh_CODEC_PT portRef,
+    in ConnectionId id,
+    in UserData userData
+  ) return Result;
+
+  external function f_IPL4_getUserData(
+    inout Iuh_CODEC_PT portRef,
+    in ConnectionId id,
+    out UserData userData
+  ) return Result;
+
+}
diff --git a/library/Iuh_CodecPort_CtrlFunctDef.cc b/library/Iuh_CodecPort_CtrlFunctDef.cc
new file mode 100644
index 000000000..2f08deca1
--- /dev/null
+++ b/library/Iuh_CodecPort_CtrlFunctDef.cc
@@ -0,0 +1,55 @@
+#include "IPL4asp_PortType.hh"
+#include "Iuh_CodecPort.hh"
+#include "IPL4asp_PT.hh"
+
+namespace Iuh__CodecPort__CtrlFunct {
+
+  IPL4asp__Types::Result f__IPL4__listen(
+    Iuh__CodecPort::Iuh__CODEC__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(
+    Iuh__CodecPort::Iuh__CODEC__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(
+    Iuh__CodecPort::Iuh__CODEC__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(
+    Iuh__CodecPort::Iuh__CODEC__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(
+    Iuh__CodecPort::Iuh__CODEC__PT& portRef,
+    const IPL4asp__Types::ConnectionId& connId,
+    IPL4asp__Types::UserData& userData)
+  {
+    return f__IPL4__PROVIDER__getUserData(portRef, connId, userData);
+  }
+
+}
diff --git a/library/Iuh_Emulation.ttcn b/library/Iuh_Emulation.ttcn
new file mode 100644
index 000000000..75a95ba83
--- /dev/null
+++ b/library/Iuh_Emulation.ttcn
@@ -0,0 +1,212 @@
+module Iuh_Emulation {
+
+/* Iuh Emulation, runs on top of Iuh_CodecPort.  It multiplexes/demultiplexes
+ * HNBAP and RUA.
+ *
+ * The Iuh_Emulation.main() function processes Iuh primitives from the Iuh
+ * socket via the Iuh_CodecPort, and dispatches them to HNBAP/RUA ports.
+ *
+ * (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * Author: Pau Espin Pedrol <pespin@sysmocom.de>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+import from Iuh_CodecPort all;
+import from Iuh_CodecPort_CtrlFunct all;
+import from HNBAP_Types all;
+import from HNBAP_Constants all;
+import from HNBAP_PDU_Contents all;
+import from HNBAP_PDU_Descriptions all;
+import from HNBAP_IEs all;
+import from HNBAP_Templates all;
+import from RUA_Types all;
+import from RUA_Constants all;
+import from RUA_PDU_Contents all;
+import from RUA_PDU_Descriptions all;
+import from RUA_IEs all;
+import from RUA_Templates all;
+import from Iuh_Types all;
+
+import from General_Types all;
+import from Misc_Helpers all;
+import from Osmocom_Types all;
+import from IPL4asp_Types all;
+import from DNS_Helpers all;
+
+type enumerated IUHEM_EventUpDown {
+	IUHEM_EVENT_DOWN,
+	IUHEM_EVENT_UP
+}
+
+/* an event indicating us whether or not a connection is physically up or down. */
+type union IUHEM_Event {
+	IUHEM_EventUpDown	up_down
+}
+
+type port HNBAP_PT message {
+	inout HNBAP_PDU, IUHEM_Event;
+} with { extension "internal" };
+type port RUA_PT message {
+	inout RUA_PDU, IUHEM_Event;
+} with { extension "internal" };
+
+type component Iuh_Emulation_CT {
+	/* Port facing to the SCTP SUT */
+	port Iuh_CODEC_PT Iuh;
+	/* Port facing to user upper side stack: */
+	port HNBAP_PT HNBAP;
+	port RUA_PT RUA;
+
+	var Iuh_conn_parameters g_pars;
+	var charstring g_Iuh_id;
+	var integer g_self_conn_id := -1;
+	var IPL4asp_Types.ConnectionId g_last_conn_id := -1; /* server only */
+}
+
+type record Iuh_conn_parameters {
+	HostName remote_ip,
+	PortNumber remote_sctp_port,
+	HostName local_ip,
+	PortNumber local_sctp_port
+}
+
+function tr_Iuh_RecvFrom_R(template Iuh_PDU msg)
+runs on Iuh_Emulation_CT return template Iuh_RecvFrom {
+	var template Iuh_RecvFrom mrf := {
+		connId := ?,
+		remName := ?,
+		remPort := ?,
+		locName := ?,
+		locPort := ?,
+		msg := msg
+	}
+	return mrf;
+}
+
+private template (value) SctpTuple ts_SCTP(template (omit) integer ppid := omit) := {
+	sinfo_stream := omit,
+	sinfo_ppid := ppid,
+	remSocks := omit,
+	assocId := omit
+};
+
+private template PortEvent tr_SctpAssocChange := {
+	sctpEvent := {
+		sctpAssocChange := ?
+	}
+}
+private template PortEvent tr_SctpPeerAddrChange := {
+	sctpEvent := {
+		sctpPeerAddrChange := ?
+	}
+}
+
+private function emu_is_server() runs on Iuh_Emulation_CT return boolean {
+	return g_pars.remote_sctp_port == -1
+}
+
+/* Resolve TCP/IP connection identifier depending on server/client mode */
+private function f_iuh_conn_id() runs on Iuh_Emulation_CT
+return IPL4asp_Types.ConnectionId {
+	var IPL4asp_Types.ConnectionId conn_id;
+
+	if (not emu_is_server()) {
+		conn_id := g_self_conn_id;
+	} else {
+		conn_id := g_last_conn_id;
+	}
+
+	if (conn_id == -1) { /* Just to be sure */
+		f_shutdown(__FILE__, __LINE__, fail, "Connection is not established");
+	}
+
+	return conn_id;
+}
+
+function main(Iuh_conn_parameters p, charstring id) runs on Iuh_Emulation_CT {
+	var Result res;
+	g_pars := p;
+	g_Iuh_id := id;
+
+	map(self:Iuh, system:Iuh_CODEC_PT);
+	if (emu_is_server()) {
+		res := Iuh_CodecPort_CtrlFunct.f_IPL4_listen(Iuh, p.local_ip, p.local_sctp_port, { sctp := valueof(ts_SCTP) });
+	} else {
+		res := Iuh_CodecPort_CtrlFunct.f_IPL4_connect(Iuh, p.remote_ip, p.remote_sctp_port,
+								p.local_ip, p.local_sctp_port, -1, { sctp := valueof(ts_SCTP) });
+	}
+	if (not ispresent(res.connId)) {
+		f_shutdown(__FILE__, __LINE__, fail, "Could not connect Iuh socket, check your configuration");
+	}
+	g_self_conn_id := res.connId;
+
+	/* notify user about SCTP establishment */
+	if (p.remote_sctp_port != -1) {
+		HNBAP.send(IUHEM_Event:{up_down:=IUHEM_EVENT_UP});
+	}
+
+	while (true) {
+		var Iuh_RecvFrom mrf;
+		var HNBAP_PDU hnbap_msg;
+		var RUA_PDU rua_msg;
+		var ASP_Event asp_evt;
+
+		alt {
+		/* HNBAP from client: pass on transparently */
+		[] HNBAP.receive(HNBAP_PDU:?) -> value hnbap_msg {
+			/* Pass message through */
+			Iuh.send(t_Iuh_Send_HNBAP(f_iuh_conn_id(), hnbap_msg));
+			}
+		/* RUA from client: pass on transparently */
+		[] RUA.receive(RUA_PDU:?) -> value rua_msg {
+			/* Pass message through */
+			Iuh.send(t_Iuh_Send_RUA(f_iuh_conn_id(), rua_msg));
+			}
+
+		/* Iuh received from peer (HNBGW or HnodeB) */
+		[] Iuh.receive(tr_Iuh_RecvFrom_R(?)) -> value mrf {
+			if (not match(mrf.connId, f_iuh_conn_id())) {
+				f_shutdown(__FILE__, __LINE__, fail, log2str("Received message from unexpected conn_id!", mrf));
+			}
+
+			if (match(mrf, t_Iuh_RecvFrom_HNBAP(?))) {
+				HNBAP.send(mrf.msg.hnbap);
+			} else if (match(mrf, t_Iuh_RecvFrom_RUA(?))) {
+				RUA.send(mrf.msg.rua);
+			} else {
+				/* TODO: special handling, as it contains multiple HNB connection ids */
+				f_shutdown(__FILE__, __LINE__, fail, log2str("UNEXPECTED MESSAGE RECEIVED!", mrf));
+			}
+		}
+		[] Iuh.receive(tr_SctpAssocChange) { }
+		[] Iuh.receive(tr_SctpPeerAddrChange)  { }
+
+		/* server only */
+		[] Iuh.receive(ASP_Event:{connOpened:=?}) -> value asp_evt {
+			if (not emu_is_server()) {
+				f_shutdown(__FILE__, __LINE__, fail, log2str("Unexpected event receiver in client mode", asp_evt));
+			}
+			g_last_conn_id := asp_evt.connOpened.connId;
+			log("Established a new Iuh connection (conn_id=", g_last_conn_id, ")");
+
+			HNBAP.send(IUHEM_Event:{up_down:=IUHEM_EVENT_UP}); /* TODO: send g_last_conn_id */
+		}
+
+		[] Iuh.receive(ASP_Event:{connClosed:=?}) -> value asp_evt {
+			log("Iuh: Closed");
+			g_self_conn_id := -1;
+			HNBAP.send(IUHEM_Event:{up_down:=IUHEM_EVENT_DOWN});  /* TODO: send asp_evt.connClosed.connId */
+			if (not emu_is_server()) {
+				self.stop;
+			}
+		}
+		}
+	}
+}
+
+}
diff --git a/library/Iuh_Types.ttcn b/library/Iuh_Types.ttcn
new file mode 100644
index 000000000..17f9c5f25
--- /dev/null
+++ b/library/Iuh_Types.ttcn
@@ -0,0 +1,36 @@
+/* Osmocom Iuh Interface Types
+ * (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * Author: Pau Espin Pedrol <pespin@sysmocom.de>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+ /* Iuh Codec Port Types
+  *
+  * (C) 2019 by Harald Welte <laforge@gnumonks.org>
+  * All rights reserved.
+  *
+  * Released under the terms of GNU General Public License, Version 2 or
+  * (at your option) any later version.
+  *
+  * SPDX-License-Identifier: GPL-2.0-or-later
+  */
+
+module Iuh_Types {
+
+import from HNBAP_PDU_Descriptions all;
+import from HNBAP_Types all;
+import from RUA_PDU_Descriptions all;
+import from RUA_Types all;
+
+type union Iuh_PDU {
+	HNBAP_PDU	hnbap,
+	RUA_PDU		rua,
+	octetstring	payload
+}
+
+};
diff --git a/library/hnbap/HNBAP_Templates.ttcn b/library/hnbap/HNBAP_Templates.ttcn
new file mode 100644
index 000000000..44704f872
--- /dev/null
+++ b/library/hnbap/HNBAP_Templates.ttcn
@@ -0,0 +1,135 @@
+/* HNBAP Templates in TTCN-3
+ * (C) 2021 Pau Espin Pedrol <pespin@sysmocom.de>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+module HNBAP_Templates {
+
+import from General_Types all;
+import from Osmocom_Types all;
+
+import from HNBAP_IEs all;
+import from HNBAP_CommonDataTypes all;
+import from HNBAP_Constants all;
+import from HNBAP_Containers all;
+import from HNBAP_PDU_Contents all;
+import from HNBAP_PDU_Descriptions all;
+
+/*********************************************************************************
+ * 3GPP TS 25.469
+ *********************************************************************************/
+
+template (value) Cause ts_HnbapCause(template (value) CauseRadioNetwork c) := {
+	radioNetwork := c
+}
+
+/* 9.1.3 HNB REGISTER REQUEST */
+template (present) HNBAP_PDU
+tr_HNBAP_HNBRegisterRequest(template (present) octetstring hNB_Identity_Info := ?,
+		 template (present) OCT3 plmnid := ?,
+		 template (present) BIT28 cell_identity := ?,
+		 template (present) OCT2 lac := ?,
+		 template (present) OCT1 rac := ?,
+		 template (present) OCT2 sac := ?) := {
+	initiatingMessage := {
+		procedureCode := id_HNBRegister,
+		criticality := reject,
+		value_ := {
+			hNBRegisterRequest := {
+				protocolIEs := {
+					{
+						id := HNBAP_Constants.id_HNB_Identity,
+						criticality := reject,
+						value_ := {
+							hNB_Identity := {
+								hNB_Identity_Info := hNB_Identity_Info,
+								iE_Extensions := omit
+							}
+						}
+					}, {
+						id := 8,
+						criticality := reject,
+						value_ := {
+							hNB_Location_Information := {
+									macroCoverageInfo := omit,
+									geographicalCoordinates := omit,
+									iE_Extensions := omit
+							}
+						}
+					}, {
+						id := 9,
+						criticality := reject,
+						value_ := { pLMNidentity := plmnid }
+					}, {
+						id := 11,
+						criticality := reject,
+						value_ := { cellIdentity := cell_identity }
+					}, {
+						id := 6,
+						criticality := reject,
+						value_ := { lAC := lac }
+					}, {
+						id := 7,
+						criticality := reject,
+						value_ := { rAC := rac }
+					}, {
+						id := 10,
+						criticality := reject,
+						value_ := { sAC := sac }
+					}
+				},
+				protocolExtensions := omit
+			}
+		}
+	}
+}
+
+
+/* 9.1.4 HNB REGISTER ACCEPT */
+template (value) HNBAP_PDU
+ts_HNBAP_HNBRegisterAccept(template (value) uint16_t rnc_id) := {
+	successfulOutcome := {
+		procedureCode := id_HNBRegister,
+		criticality := reject,
+		value_ := {
+			hNBRegisterAccept := {
+				protocolIEs := {
+					{
+						id := HNBAP_Constants.id_RNC_ID,
+						criticality := reject,
+						value_ := { RNC_ID := rnc_id }
+					}
+				},
+				protocolExtensions := omit /* TODO: Mux Port Number (optional) 9.2.29 */
+			}
+		}
+	}
+}
+
+/* 9.1.5 HNB REGISTER REJECT */
+template (value) HNBAP_PDU
+ts_HNBAP_HNBRegisterReject(template (value) Cause cause) := {
+	unsuccessfulOutcome := {
+		procedureCode := id_HNBRegister,
+		criticality := reject,
+		value_ := {
+			HNBRegisterReject := {
+				protocolIEs := {
+					{
+						id := HNBAP_Constants.id_Cause,
+						criticality := ignore,
+						value_ := { Cause := cause }
+					}
+				},
+				protocolExtensions := omit /* TODO: CriticalityDiagnostics, BackoffTimer */
+			}
+		}
+	}
+}
+
+}
diff --git a/library/rua/RUA_Templates.ttcn b/library/rua/RUA_Templates.ttcn
new file mode 100644
index 000000000..b7387bffc
--- /dev/null
+++ b/library/rua/RUA_Templates.ttcn
@@ -0,0 +1,22 @@
+/* RUA Templates in TTCN-3
+ * (C) 2021 Pau Espin Pedrol <pespin@sysmocom.de>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+module RUA_Templates {
+
+import from RUA_IEs all;
+import from RUA_CommonDataTypes all;
+import from RUA_Constants all;
+import from RUA_Containers all;
+import from RUA_PDU_Contents all;
+import from RUA_PDU_Descriptions all;
+
+
+/* TODO: Add RUA Templates here */
+}