diff --git a/openbsc/include/openbsc/bsc_api.h b/openbsc/include/openbsc/bsc_api.h
index 51e344f..2cfdbb4 100644
--- a/openbsc/include/openbsc/bsc_api.h
+++ b/openbsc/include/openbsc/bsc_api.h
@@ -1,6 +1,25 @@
 /* GSM 08.08 like API for OpenBSC */
 
+#ifndef OPENBSC_BSC_API_H
+#define OPENBSC_BSC_API_H
+
 #include "gsm_data.h"
 
+struct bsc_api {
+	void (*sapi_n_reject)(struct gsm_subscriber_connection *conn, int dlci);
+	void (*cipher_mode_compl)(struct gsm_subscriber_connection *conn,
+				  struct msgb *msg, uint16_t ind);
+	void (*compl_l3)(struct gsm_subscriber_connection *conn,
+			 struct msgb *msg, uint16_t chosen_channel); 
+	void (*ass_compl)(struct gsm_subscriber_connection *conn,
+			  uint16_t rr_cause);
+	void (*ass_fail)(struct gsm_subscriber_connection *conn,
+			 uint16_t rr_cause);
+	void (*clear_request)(struct gsm_subscriber_connection *conn,
+			      uint32_t cause);
+	void (*clear_compl)(struct gsm_subscriber_connection *conn);
+};
 
 int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn, struct msgb *msg, int link_id);
+
+#endif