diff --git a/pcu/PCU_Tests_RAW_SNS.ttcn b/pcu/PCU_Tests_RAW_SNS.ttcn
index fa906a8..a306fe4 100644
--- a/pcu/PCU_Tests_RAW_SNS.ttcn
+++ b/pcu/PCU_Tests_RAW_SNS.ttcn
@@ -3,11 +3,49 @@
 import from Osmocom_Types all;
 import from PCU_Tests all;
 import from PCU_Tests_RAW all;
+import from Osmocom_Gb_Types all;
+import from NS_CodecPort all;
+import from NS_Types all;
 
 /**********************************************************************************
  * Modern Gb/IP bring-up test cases using IP Sub-Network Service (SNS)
  **********************************************************************************/
 
+/* perform inbound SNS-SIZE procedure */
+function f_incoming_sns_size(template (omit) NsCause cause := omit) runs on RAW_NS_CT {
+	var PDU_NS rx;
+	/* expect one single SNS-SIZE with RESET flag; one remote v4 EP; no v6 EP */
+	rx := f_ns_exp(tr_SNS_SIZE(mp_nsconfig.nsei, rst_flag := true, max_nsvcs := ?,
+				   num_v4 := 1, num_v6 := omit));
+	NSCP.send(t_NS_Send(g_ns_conn_id, ts_SNS_SIZE_ACK(mp_nsconfig.nsei, cause)));
+}
+
+/* perform outbound SNS-SIZE procedure */
+function f_outgoing_sns_size(template (omit) NsCause cause := omit) runs on RAW_NS_CT {
+	var PDU_NS rx;
+	NSCP.send(t_NS_Send(g_ns_conn_id, ts_SNS_SIZE(mp_nsconfig.nsei, rst_flag := true, max_nsvcs := 1,
+							num_v4 := 1, num_v6 := omit)
+				));
+	/* expect one single SNS-SIZE with RESET flag; one remote v4 EP; no v6 EP */
+	rx := f_ns_exp(tr_SNS_SIZE_ACK(mp_nsconfig.nsei, cause));
+}
+
+/* perform inbound SNS-CONFIG procedure */
+function f_incoming_sns_config(template (omit) NsCause cause := omit) runs on RAW_NS_CT {
+	var PDU_NS rx;
+	rx := f_ns_exp(tr_SNS_CONFIG(mp_nsconfig.nsei, end_flag := true, v4 := ?));
+	NSCP.send(t_NS_Send(g_ns_conn_id, ts_SNS_CONFIG_ACK(mp_nsconfig.nsei, cause)));
+}
+
+/* perform outbound SNS-CONFIG procedure */
+function f_outgoing_sns_config(template (omit) NsCause cause := omit) runs on RAW_NS_CT {
+	var PDU_NS rx;
+	var template (omit) IP4_Elements v4 := { ts_SNS_IPv4(mp_nsconfig.local_ip,
+							     mp_nsconfig.local_udp_port) }
+	NSCP.send(t_NS_Send(g_ns_conn_id, ts_SNS_CONFIG(mp_nsconfig.nsei, true, v4)));
+	rx := f_ns_exp(tr_SNS_CONFIG_ACK(mp_nsconfig.nsei, cause));
+}
+
 /* PCU-originated SNS-SIZE: successful case */
 testcase TC_sns_po_size_success() runs on RAW_NS_CT {
 	f_init_ns_codec();