diff --git a/include/osmocom/msc/gsm_04_08.h b/include/osmocom/msc/gsm_04_08.h
new file mode 100644
index 0000000..c99fc86
--- /dev/null
+++ b/include/osmocom/msc/gsm_04_08.h
@@ -0,0 +1,85 @@
+#ifndef _GSM_04_08_H
+#define _GSM_04_08_H
+
+#include <osmocom/gsm/gsm48.h>
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+
+#include <osmocom/msc/meas_rep.h>
+
+struct msgb;
+struct gsm_bts;
+struct gsm_network;
+struct gsm_trans;
+struct gsm_subscriber_connection;
+struct amr_multirate_conf;
+struct amr_mode;
+struct bsc_subscr;
+
+#define GSM48_ALLOC_SIZE	2048
+#define GSM48_ALLOC_HEADROOM	256
+
+static inline struct msgb *gsm48_msgb_alloc_name(const char *name)
+{
+	return msgb_alloc_headroom(GSM48_ALLOC_SIZE, GSM48_ALLOC_HEADROOM,
+				   name);
+}
+
+void cm_service_request_concludes(struct gsm_subscriber_connection *conn,
+				  struct msgb *msg);
+
+/* config options controlling the behaviour of the lower leves */
+void gsm0408_allow_everyone(int allow);
+void gsm0408_clear_all_trans(struct gsm_network *net, int protocol);
+int gsm0408_dispatch(struct gsm_subscriber_connection *conn, struct msgb *msg);
+
+int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id);
+enum gsm_chan_t get_ctype_by_chreq(struct gsm_network *bts, uint8_t ra);
+/* don't use "enum gsm_chreq_reason_t" to avoid circular dependency */
+int get_reason_by_chreq(uint8_t ra, int neci);
+void gsm_net_update_ctype(struct gsm_network *net);
+
+int gsm48_tx_mm_info(struct gsm_subscriber_connection *conn);
+int gsm48_tx_mm_auth_req(struct gsm_subscriber_connection *conn, uint8_t *rand,
+			 uint8_t *autn, int key_seq);
+int gsm48_tx_mm_auth_rej(struct gsm_subscriber_connection *conn);
+int gsm48_tx_mm_serv_ack(struct gsm_subscriber_connection *conn);
+int gsm48_tx_mm_serv_rej(struct gsm_subscriber_connection *conn,
+				enum gsm48_reject_value value);
+int gsm48_send_rr_release(struct gsm_lchan *lchan);
+int gsm48_send_rr_ciph_mode(struct gsm_lchan *lchan, int want_imeisv);
+int gsm48_send_rr_app_info(struct gsm_subscriber_connection *conn, uint8_t apdu_id,
+			   uint8_t apdu_len, const uint8_t *apdu);
+int gsm48_send_rr_ass_cmd(struct gsm_lchan *dest_lchan, struct gsm_lchan *lchan, uint8_t power_class);
+int gsm48_send_ho_cmd(struct gsm_lchan *old_lchan, struct gsm_lchan *new_lchan,
+		      uint8_t power_command, uint8_t ho_ref);
+
+int mncc_tx_to_cc(struct gsm_network *net, int msg_type, void *arg);
+
+/* convert a ASCII phone number to call-control BCD */
+int encode_bcd_number(uint8_t *bcd_lv, uint8_t max_len,
+		      int h_len, const char *input);
+int decode_bcd_number(char *output, int output_len, const uint8_t *bcd_lv,
+		      int h_len);
+
+int send_siemens_mrpci(struct gsm_lchan *lchan, uint8_t *classmark2_lv);
+int gsm48_extract_mi(uint8_t *classmark2, int length, char *mi_string, uint8_t *mi_type);
+int gsm48_paging_extract_mi(struct gsm48_pag_resp *pag, int length, char *mi_string, uint8_t *mi_type);
+
+int gsm48_lchan_modify(struct gsm_lchan *lchan, uint8_t lchan_mode);
+int gsm48_rx_rr_modif_ack(struct msgb *msg);
+int gsm48_parse_meas_rep(struct gsm_meas_rep *rep, struct msgb *msg);
+
+struct msgb *gsm48_create_mm_serv_rej(enum gsm48_reject_value value);
+struct msgb *gsm48_create_loc_upd_rej(uint8_t cause);
+void gsm48_lchan2chan_desc(struct gsm48_chan_desc *cd,
+			   const struct gsm_lchan *lchan);
+
+void release_security_operation(struct gsm_subscriber_connection *conn);
+void allocate_security_operation(struct gsm_subscriber_connection *conn);
+
+int gsm48_multirate_config(uint8_t *lv, const struct amr_multirate_conf *mr, const struct amr_mode *modes);
+
+int gsm48_tch_rtp_create(struct gsm_trans *trans);
+
+#endif