diff --git a/src/libiu/iu_vty.c b/src/libiu/iu_vty.c
index 91eed96..73ad126 100644
--- a/src/libiu/iu_vty.c
+++ b/src/libiu/iu_vty.c
@@ -18,33 +18,91 @@
  */
 
 #include <stdlib.h>
+#include <string.h>
 
+#include <osmocom/core/logging.h>
 #include <osmocom/vty/command.h>
 #include <osmocom/vty/logging.h>
 
-/* Pointer to the actual asn_debug value as passed from main scopes. */
-static int *g_asn_debug_p = NULL;
+#include <openbsc/iu.h>
+
+static enum nsap_addr_enc *g_rab_assign_addr_enc = NULL;
 
 DEFUN(logging_asn_debug,
       logging_asn_debug_cmd,
       "logging asn1-debug (1|0)",
       LOGGING_STR
+      "Log ASN.1 debug messages to stderr\n"
+      "Log ASN.1 debug messages to stderr\n"
+      "Do not log ASN.1 debug messages to stderr\n")
+{
+	asn_debug = atoi(argv[0]);
+	return CMD_SUCCESS;
+}
+
+DEFUN(logging_asn_xer_print,
+      logging_asn_xer_print_cmd,
+      "logging asn1-xer-print (1|0)",
+      LOGGING_STR
       "Log human readable representations of all ASN.1 messages to stderr\n"
       "Log decoded ASN.1 messages to stderr\n"
       "Do not log decoded ASN.1 messages to stderr\n")
 {
-	if (!g_asn_debug_p) {
-		vty_out(vty, "%%ASN.1 debugging not available%s", VTY_NEWLINE);
-		return CMD_WARNING;
-	}
-
-	*g_asn_debug_p = atoi(argv[0]);
+	asn1_xer_print = atoi(argv[0]);
 	return CMD_SUCCESS;
 }
 
-void iu_vty_init(int *asn_debug_p)
+DEFUN(cfg_iu_rab_assign_addr_enc, cfg_iu_rab_assign_addr_enc_cmd,
+      "iu rab-assign-addr-enc (x213|v4raw)",
+      "Iu interface protocol options\n"
+      "Choose RAB Assignment's Transport Layer Address encoding\n"
+      "ITU-T X.213 compliant address encoding (default)\n"
+      "32bit length raw IPv4 address (for ip.access nano3G)\n")
 {
-	g_asn_debug_p = asn_debug_p;
+	if (!g_rab_assign_addr_enc) {
+		vty_out(vty, "%%RAB Assignment Transport Layer Address"
+			" encoding not available%s", VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	if (strcmp(argv[0], "v4raw") == 0)
+		*g_rab_assign_addr_enc = NSAP_ADDR_ENC_V4RAW;
+	else
+		*g_rab_assign_addr_enc = NSAP_ADDR_ENC_X213;
+	return CMD_SUCCESS;
+}
+
+int iu_vty_config_write(struct vty *vty, const char *indent)
+{
+	if (!g_rab_assign_addr_enc) {
+		vty_out(vty, "%%RAB Assignment Transport Layer Address"
+			" encoding not available%s", VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	switch (*g_rab_assign_addr_enc) {
+	case NSAP_ADDR_ENC_V4RAW:
+		vty_out(vty, "%siu rab-assign-addr-enc v4raw%s", indent,
+			VTY_NEWLINE);
+		break;
+	case NSAP_ADDR_ENC_X213:
+		/* default value, no need to write anything */
+		break;
+	default:
+		LOGP(0, LOGL_ERROR, "Invalid value for"
+		     " net.iu.rab_assign_addr_enc: %d\n",
+		     *g_rab_assign_addr_enc);
+		return CMD_WARNING;
+	}
+
+	return CMD_SUCCESS;
+}
+
+void iu_vty_init(int iu_parent_node, enum nsap_addr_enc *rab_assign_addr_enc)
+{
+	g_rab_assign_addr_enc = rab_assign_addr_enc;
 
 	install_element(CFG_LOG_NODE, &logging_asn_debug_cmd);
+	install_element(CFG_LOG_NODE, &logging_asn_xer_print_cmd);
+	install_element(iu_parent_node, &cfg_iu_rab_assign_addr_enc_cmd);
 }