diff --git a/include/openbsc/iucs.h b/include/openbsc/iucs.h
new file mode 100644
index 0000000..fb61a5c
--- /dev/null
+++ b/include/openbsc/iucs.h
@@ -0,0 +1,7 @@
+#pragma once
+
+int gsm0408_rcvmsg_iucs(struct gsm_network *network, struct msgb *msg,
+			uint16_t *lac);
+
+struct gsm_subscriber_connection *subscr_conn_lookup_iu(struct gsm_network *network,
+							struct ue_conn_ctx *ue);