diff --git a/src/gsm_subscriber.c b/src/gsm_subscriber.c
new file mode 100644
index 0000000..76d2e35
--- /dev/null
+++ b/src/gsm_subscriber.c
@@ -0,0 +1,42 @@
+/* Dummy implementation of a subscriber database, roghly HLR/VLR functionality */
+
+/* (C) 2008 by Harald Welte <laforge@gnumonks.org>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+
+#include "gsm_subscriber.h"
+
+static struct gsm_subscriber subscr = {
+	.name = "Test User 1",
+	.tmsi = { 0x22, 0x33, 0x44, 0x55 },
+};
+
+struct gsm_subscriber *subscr_get_by_tmsi(u_int8_t *tmsi)
+{
+	return &subscr;
+}
+struct gsm_subscriber *subscr_get_by_imsi(u_int8_t *imsi)
+{
+	return &subscr;
+}
+
+int subscr_update(struct gsm_subscriber *s, struct gsm_bts *bts)
+{
+	return 0;
+}