diff --git a/library/RAW_NS.ttcnpp b/library/RAW_NS.ttcnpp
index 2aaa770..298ef1e 100644
--- a/library/RAW_NS.ttcnpp
+++ b/library/RAW_NS.ttcnpp
@@ -266,4 +266,188 @@
 		}
 }
 
+/**********************************************************************************
+ * IP Sub-Network Service (SNS)
+ **********************************************************************************/
+
+/* perform inbound SNS-SIZE procedure */
+function f_incoming_sns_size(template (omit) NsCause cause := omit, integer idx := 0)
+runs on RAW_NS_CT {
+	log("f_incoming_sns_size(idx=", idx, ")");
+	var PDU_NS rx;
+	var NSVCConfiguration nsvc_cfg := g_nsconfig.nsvc[idx];
+
+	if (nsvc_cfg.provider.ip.address_family == AF_INET) {
+		/* expect one single SNS-SIZE with RESET flag; 4x v4 EP; no v6 EP */
+		rx := f_ns_exp(tr_SNS_SIZE(g_nsconfig.nsei, rst_flag := true, max_nsvcs := 8,
+					   num_v4 := 4, num_v6 := omit), idx);
+	} else {
+		/* expect one single SNS-SIZE with RESET flag; no v4 EP; 4x v6 EP */
+		rx := f_ns_exp(tr_SNS_SIZE(g_nsconfig.nsei, rst_flag := true, max_nsvcs := 8,
+					   num_v4 := omit, num_v6 := 4), idx);
+	}
+	NSCP[idx].send(ts_SNS_SIZE_ACK(g_nsconfig.nsei, cause));
+}
+
+/* perform outbound SNS-SIZE procedure */
+function f_outgoing_sns_size(template (omit) NsCause cause := omit, integer idx:= 0)
+runs on RAW_NS_CT {
+	log("f_outgoing_sns_size(idx=", idx, ")");
+	var PDU_NS rx;
+	var NSVCConfiguration nsvc_cfg := g_nsconfig.nsvc[idx];
+
+	if (nsvc_cfg.provider.ip.address_family == AF_INET) {
+		NSCP[idx].send(ts_SNS_SIZE(g_nsconfig.nsei, rst_flag := true, max_nsvcs := 1,
+								num_v4 := 1, num_v6 := omit)
+					);
+	} else {
+		NSCP[idx].send(ts_SNS_SIZE(g_nsconfig.nsei, rst_flag := true, max_nsvcs := 1,
+								num_v4 := omit, num_v6 := 1)
+					);
+	}
+	/* expect one single SNS-SIZE with RESET flag; 4x v4 EP; no v6 EP */
+	rx := f_ns_exp(tr_SNS_SIZE_ACK(g_nsconfig.nsei, cause), idx);
+}
+
+/* perform inbound SNS-CONFIG procedure */
+function f_incoming_sns_config(template (omit) NsCause cause := omit, integer idx := 0)
+runs on RAW_NS_CT {
+	log("f_incoming_sns_config(idx=", idx, ")");
+	var PDU_NS rx;
+	var NSVCConfiguration nsvc_cfg := g_nsconfig.nsvc[idx];
+
+	if (nsvc_cfg.provider.ip.address_family == AF_INET) {
+		var template IP4_Elements v4_elem := { tr_SNS_IPv4(nsvc_cfg.provider.ip.remote_ip,
+								   nsvc_cfg.provider.ip.remote_udp_port) };
+		rx := f_ns_exp(tr_SNS_CONFIG(g_nsconfig.nsei, end_flag := true, v4 := v4_elem), idx);
+	} else {
+		var template IP6_Elements v6_elem := { tr_SNS_IPv6(nsvc_cfg.provider.ip.remote_ip,
+								   nsvc_cfg.provider.ip.remote_udp_port) };
+		rx := f_ns_exp(tr_SNS_CONFIG(g_nsconfig.nsei, end_flag := true, v6 := v6_elem), idx);
+	}
+	NSCP[idx].send(ts_SNS_CONFIG_ACK(g_nsconfig.nsei, cause));
+}
+
+/* perform outbound SNS-CONFIG procedure */
+function f_outgoing_sns_config(template (omit) NsCause cause := omit, integer idx := 0)
+runs on RAW_NS_CT {
+	log("f_outgoing_sns_config(idx=", idx, ")");
+	var PDU_NS rx;
+	var NSVCConfiguration nsvc_cfg := g_nsconfig.nsvc[idx];
+
+	if (nsvc_cfg.provider.ip.address_family == AF_INET) {
+		var template (omit) IP4_Elements v4 := { ts_SNS_IPv4(nsvc_cfg.provider.ip.local_ip,
+								     nsvc_cfg.provider.ip.local_udp_port) }
+		NSCP[idx].send(ts_SNS_CONFIG(g_nsconfig.nsei, true, v4));
+	} else {
+		var template (omit) IP6_Elements v6 := { ts_SNS_IPv6(nsvc_cfg.provider.ip.local_ip,
+								     nsvc_cfg.provider.ip.local_udp_port) }
+		NSCP[idx].send(ts_SNS_CONFIG(g_nsconfig.nsei, true, omit, v6));
+	}
+	rx := f_ns_exp(tr_SNS_CONFIG_ACK(g_nsconfig.nsei, cause), idx);
+}
+
+/* perform outbound SNS-CONFIG procedure (separate endpoints: 1 for control, 1 for user */
+function f_outgoing_sns_config_1c1u(template (omit) NsCause cause := omit, integer idx := 0)
+runs on RAW_NS_CT {
+	log("f_outgoing_sns_config_1c1u(idx=", idx, ")");
+	var PDU_NS rx;
+
+	if (g_nsconfig.nsvc[0].provider.ip.address_family == AF_INET) {
+		var template (omit) IP4_Elements v4 := { ts_SNS_IPv4(g_nsconfig.nsvc[0].provider.ip.local_ip,
+								     g_nsconfig.nsvc[0].provider.ip.local_udp_port, 1, 0),
+							 ts_SNS_IPv4(g_nsconfig.nsvc[1].provider.ip.local_ip,
+								     g_nsconfig.nsvc[1].provider.ip.local_udp_port, 0, 1) };
+		NSCP[idx].send(ts_SNS_CONFIG(g_nsconfig.nsei, true, v4));
+	} else {
+		var template (omit) IP6_Elements v6 := { ts_SNS_IPv6(g_nsconfig.nsvc[0].provider.ip.local_ip,
+								     g_nsconfig.nsvc[0].provider.ip.local_udp_port, 1, 0),
+							 ts_SNS_IPv6(g_nsconfig.nsvc[1].provider.ip.local_ip,
+								     g_nsconfig.nsvc[1].provider.ip.local_udp_port, 0, 1) };
+		NSCP[idx].send(ts_SNS_CONFIG(g_nsconfig.nsei, true, omit, v6));
+	}
+	rx := f_ns_exp(tr_SNS_CONFIG_ACK(g_nsconfig.nsei, cause), idx);
+}
+
+/* perform outbound SNS-CONFIG procedure (separate endpoints: 1 for control, 1 for user */
+function f_outgoing_sns_config_1c1u_separate(template (omit) NsCause cause := omit, integer idx := 0)
+runs on RAW_NS_CT {
+	log("f_outgoing_sns_config_1c1u_separate(idx=", idx, ")");
+	var PDU_NS rx;
+	if (g_nsconfig.nsvc[0].provider.ip.address_family == AF_INET) {
+		var template (omit) IP4_Elements v4 := { ts_SNS_IPv4(g_nsconfig.nsvc[1].provider.ip.local_ip,
+								     g_nsconfig.nsvc[1].provider.ip.local_udp_port, 1, 0),
+							 ts_SNS_IPv4(g_nsconfig.nsvc[2].provider.ip.local_ip,
+								     g_nsconfig.nsvc[2].provider.ip.local_udp_port, 0, 1) };
+		NSCP[idx].send(ts_SNS_CONFIG(g_nsconfig.nsei, true, v4));
+	} else {
+		var template (omit) IP6_Elements v6 := { ts_SNS_IPv6(g_nsconfig.nsvc[1].provider.ip.local_ip,
+								     g_nsconfig.nsvc[1].provider.ip.local_udp_port, 1, 0),
+							 ts_SNS_IPv6(g_nsconfig.nsvc[2].provider.ip.local_ip,
+								     g_nsconfig.nsvc[2].provider.ip.local_udp_port, 0, 1) };
+		NSCP[idx].send(ts_SNS_CONFIG(g_nsconfig.nsei, true, omit, v6));
+	}
+	rx := f_ns_exp(tr_SNS_CONFIG_ACK(g_nsconfig.nsei, cause), idx);
+}
+
+function f_outgoing_sns_add(integer idx_add, uint8_t w_sig := 1, uint8_t w_user := 1, integer idx := 0, template (omit) NsCause cause := omit)
+runs on RAW_NS_CT {
+	log("f_outgoing_sns_add(idx_add=", idx_add, ")");
+	var PDU_NS rx;
+	var NSVCConfiguration nsvc_cfg := g_nsconfig.nsvc[idx_add];
+	if (nsvc_cfg.provider.ip.address_family == AF_INET) {
+		var template (omit) IP4_Elements v4 := { ts_SNS_IPv4(nsvc_cfg.provider.ip.local_ip,
+								     nsvc_cfg.provider.ip.local_udp_port,
+								     w_sig, w_user) };
+		NSCP[idx].send(ts_SNS_ADD(g_nsconfig.nsei, 23, v4));
+		rx := f_ns_exp(tr_SNS_ACK(g_nsconfig.nsei, 23, cause, v4));
+	} else {
+		var template (omit) IP6_Elements v6 := { ts_SNS_IPv6(nsvc_cfg.provider.ip.local_ip,
+								     nsvc_cfg.provider.ip.local_udp_port,
+								     w_sig, w_user) };
+		NSCP[idx].send(ts_SNS_ADD(g_nsconfig.nsei, 23, omit, v6));
+		rx := f_ns_exp(tr_SNS_ACK(g_nsconfig.nsei, 23, cause, omit, v6));
+	}
+}
+
+function f_outgoing_sns_del(integer idx_del, uint8_t w_sig := 1, uint8_t w_user := 1, integer idx := 0)
+runs on RAW_NS_CT {
+	log("f_outgoing_sns_del(idx_del=", idx_del, ")");
+	var PDU_NS rx;
+	var NSVCConfiguration nsvc_cfg := g_nsconfig.nsvc[idx_del];
+	if (nsvc_cfg.provider.ip.address_family == AF_INET) {
+		var template (omit) IP4_Elements v4 := { ts_SNS_IPv4(nsvc_cfg.provider.ip.local_ip,
+								     nsvc_cfg.provider.ip.local_udp_port,
+								     w_sig, w_user) };
+		NSCP[idx].send(ts_SNS_DEL(g_nsconfig.nsei, 24, omit, v4));
+		rx := f_ns_exp(tr_SNS_ACK(g_nsconfig.nsei, 24, omit, v4));
+	} else {
+		var template (omit) IP6_Elements v6 := { ts_SNS_IPv6(nsvc_cfg.provider.ip.local_ip,
+								     nsvc_cfg.provider.ip.local_udp_port,
+								     w_sig, w_user) };
+		NSCP[idx].send(ts_SNS_DEL(g_nsconfig.nsei, 24, omit, omit, v6));
+		rx := f_ns_exp(tr_SNS_ACK(g_nsconfig.nsei, 24, omit, omit, v6));
+	}
+}
+
+function f_outgoing_sns_chg_weight(integer idx_chg, uint8_t w_sig, uint8_t w_user, integer idx := 0)
+runs on RAW_NS_CT {
+	log("f_outgoing_sns_chg_weight(idx_chg=", idx_chg, ")");
+	var PDU_NS rx;
+	var NSVCConfiguration nsvc_cfg := g_nsconfig.nsvc[idx_chg];
+	if (nsvc_cfg.provider.ip.address_family == AF_INET) {
+		var template (omit) IP4_Elements v4 := { ts_SNS_IPv4(nsvc_cfg.provider.ip.local_ip,
+								     nsvc_cfg.provider.ip.local_udp_port,
+								     w_sig, w_user) };
+		NSCP[idx].send(ts_SNS_CHG_WEIGHT(g_nsconfig.nsei, 25, v4));
+		rx := f_ns_exp(tr_SNS_ACK(g_nsconfig.nsei, 25, omit, v4));
+	} else {
+		var template (omit) IP6_Elements v6 := { ts_SNS_IPv6(nsvc_cfg.provider.ip.local_ip,
+								     nsvc_cfg.provider.ip.local_udp_port,
+								     w_sig, w_user) };
+		NSCP[idx].send(ts_SNS_CHG_WEIGHT(g_nsconfig.nsei, 25, omit, v6));
+		rx := f_ns_exp(tr_SNS_ACK(g_nsconfig.nsei, 25, omit, omit, v6));
+	}
+}
+
 }