osmo-msc/openbsc/include/openbsc/gsm_04_80.h

#ifndef _GSM_04_80_H
#define _GSM_04_80_H

#include <osmocore/msgb.h>
#include <osmocore/protocol/gsm_04_80.h>

#define MAX_LEN_USSD_STRING	31

struct gsm_subscriber_connection;

struct ussd_request {
			char text[MAX_LEN_USSD_STRING + 1];
			u_int8_t transaction_id;
			u_int8_t invoke_id;
};

int gsm0480_decode_ussd_request(const struct msgb *msg, 
				struct ussd_request *request); 
int gsm0480_send_ussd_response(struct gsm_subscriber_connection *conn,
			       const struct msgb *in_msg, const char* response_text, 
			       const struct ussd_request *req);
int gsm0480_send_ussd_reject(struct gsm_subscriber_connection *conn,
			     const struct msgb *msg, 
			     const struct ussd_request *request);

struct msgb *gsm0480_create_notifySS(const char *text);
struct msgb *gsm0480_create_unstructuredSS_Notify(const char *text);

int gsm0480_wrap_invoke(struct msgb *msg, int op, int link_id);
int gsm0480_wrap_facility(struct msgb *msg);

int gsm0480_send_ussdNotify(struct gsm_subscriber_connection *conn, const char *text);

#endif