diff --git a/openbsc/include/openbsc/bsc_nat.h b/openbsc/include/openbsc/bsc_nat.h
index acecba7..083746f 100644
--- a/openbsc/include/openbsc/bsc_nat.h
+++ b/openbsc/include/openbsc/bsc_nat.h
@@ -28,6 +28,7 @@
 
 #include <osmocore/select.h>
 #include <osmocore/msgb.h>
+#include <osmocore/msgfile.h>
 #include <osmocore/timer.h>
 #include <osmocore/write_queue.h>
 #include <osmocore/rate_ctr.h>
@@ -237,6 +238,10 @@
 	/* filter */
 	char *acc_lst_name;
 
+	/* number rewriting */
+	char *num_rewr_name;
+	struct msg_entries *num_rewr;
+
 	/* USSD messages  we want to match */
 	char *ussd_lst_name;
 	char *ussd_query;
diff --git a/openbsc/src/nat/bsc_nat_vty.c b/openbsc/src/nat/bsc_nat_vty.c
index 9eb8ebc..af7e94c 100644
--- a/openbsc/src/nat/bsc_nat_vty.c
+++ b/openbsc/src/nat/bsc_nat_vty.c
@@ -87,6 +87,9 @@
 	if (_nat->ussd_local)
 		vty_out(vty, " ussd-local-ip %s%s", _nat->ussd_local, VTY_NEWLINE);
 
+	if (_nat->num_rewr_name)
+		vty_out(vty, " number-rewrite %s%s", _nat->num_rewr_name, VTY_NEWLINE);
+
 	llist_for_each_entry(lst, &_nat->access_lists, list) {
 		write_acc_lst(vty, lst);
 	}
@@ -403,6 +406,25 @@
 	return CMD_SUCCESS;
 }
 
+DEFUN(cfg_nat_number_rewrite,
+      cfg_nat_number_rewrite_cmd,
+      "number-rewrite FILENAME",
+      "Set the file with rewriting rules.\n" "Filename")
+{
+	bsc_replace_string(_nat, &_nat->num_rewr_name, argv[0]);
+	if (_nat->num_rewr_name) {
+		if (_nat->num_rewr)
+			talloc_free(_nat->num_rewr);
+		_nat->num_rewr = msg_entry_parse(_nat, _nat->num_rewr_name);
+		return _nat->num_rewr == NULL ? CMD_WARNING : CMD_SUCCESS;
+	} else {
+		if (_nat->num_rewr)
+			talloc_free(_nat->num_rewr);
+		_nat->num_rewr = NULL;
+		return CMD_SUCCESS;
+	}
+}
+
 DEFUN(cfg_nat_ussd_lst_name,
       cfg_nat_ussd_lst_name_cmd,
       "ussd-list-name NAME",
@@ -688,6 +710,9 @@
 	install_element(NAT_NODE, &cfg_lst_imsi_deny_cmd);
 	install_element(NAT_NODE, &cfg_lst_no_cmd);
 
+	/* number rewriting */
+	install_element(NAT_NODE, &cfg_nat_number_rewrite_cmd);
+
 	/* BSC subgroups */
 	install_element(NAT_NODE, &cfg_bsc_cmd);
 	install_node(&bsc_node, config_write_bsc);