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diff --git a/src/libmsc/gsm_04_80.c b/src/libmsc/gsm_04_80.c
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+/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
+ * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
+
+/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2008, 2009, 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2009 by Mike Haben <michael.haben@btinternet.com>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/gsm_04_08.h>
+#include <openbsc/gsm_04_80.h>
+#include <openbsc/bsc_api.h>
+
+#include <osmocore/gsm0480.h>
+#include <osmocore/gsm_utils.h>
+#include <osmocore/msgb.h>
+#include <osmocore/tlv.h>
+
+static inline unsigned char *msgb_wrap_with_TL(struct msgb *msgb, u_int8_t tag)
+{
+ uint8_t *data = msgb_push(msgb, 2);
+
+ data[0] = tag;
+ data[1] = msgb->len - 2;
+ return data;
+}
+
+static inline unsigned char *msgb_push_TLV1(struct msgb *msgb, u_int8_t tag,
+ u_int8_t value)
+{
+ uint8_t *data = msgb_push(msgb, 3);
+
+ data[0] = tag;
+ data[1] = 1;
+ data[2] = value;
+ return data;
+}
+
+
+/* Send response to a mobile-originated ProcessUnstructuredSS-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)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh;
+ u_int8_t *ptr8;
+ int response_len;
+
+ /* First put the payload text into the message */
+ ptr8 = msgb_put(msg, 0);
+ response_len = gsm_7bit_encode(ptr8, response_text);
+ msgb_put(msg, response_len);
+
+ /* Then wrap it as an Octet String */
+ msgb_wrap_with_TL(msg, ASN1_OCTET_STRING_TAG);
+
+ /* Pre-pend the DCS octet string */
+ msgb_push_TLV1(msg, ASN1_OCTET_STRING_TAG, 0x0F);
+
+ /* Then wrap these as a Sequence */
+ msgb_wrap_with_TL(msg, GSM_0480_SEQUENCE_TAG);
+
+ /* Pre-pend the operation code */
+ msgb_push_TLV1(msg, GSM0480_OPERATION_CODE,
+ GSM0480_OP_CODE_PROCESS_USS_REQ);
+
+ /* Wrap the operation code and IA5 string as a sequence */
+ msgb_wrap_with_TL(msg, GSM_0480_SEQUENCE_TAG);
+
+ /* Pre-pend the invoke ID */
+ msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, req->invoke_id);
+
+ /* Wrap this up as a Return Result component */
+ msgb_wrap_with_TL(msg, GSM0480_CTYPE_RETURN_RESULT);
+
+ /* Wrap the component in a Facility message */
+ msgb_wrap_with_TL(msg, GSM0480_IE_FACILITY);
+
+ /* And finally pre-pend the L3 header */
+ gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
+ gh->proto_discr = GSM48_PDISC_NC_SS | req->transaction_id
+ | (1<<7); /* TI direction = 1 */
+ gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE;
+
+ return gsm0808_submit_dtap(conn, msg, 0, 0);
+}
+
+int gsm0480_send_ussd_reject(struct gsm_subscriber_connection *conn,
+ const struct msgb *in_msg,
+ const struct ussd_request *req)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh;
+
+ /* First insert the problem code */
+ msgb_push_TLV1(msg, GSM_0480_PROBLEM_CODE_TAG_GENERAL,
+ GSM_0480_GEN_PROB_CODE_UNRECOGNISED);
+
+ /* Before it insert the invoke ID */
+ msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, req->invoke_id);
+
+ /* Wrap this up as a Reject component */
+ msgb_wrap_with_TL(msg, GSM0480_CTYPE_REJECT);
+
+ /* Wrap the component in a Facility message */
+ msgb_wrap_with_TL(msg, GSM0480_IE_FACILITY);
+
+ /* And finally pre-pend the L3 header */
+ gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
+ gh->proto_discr = GSM48_PDISC_NC_SS;
+ gh->proto_discr |= req->transaction_id | (1<<7); /* TI direction = 1 */
+ gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE;
+
+ return gsm0808_submit_dtap(conn, msg, 0, 0);
+}
+
+int gsm0480_send_ussdNotify(struct gsm_subscriber_connection *conn, int level, const char *text)
+{
+ struct gsm48_hdr *gh;
+ struct msgb *msg;
+
+ msg = gsm0480_create_unstructuredSS_Notify(level, text);
+ if (!msg)
+ return -1;
+
+ gsm0480_wrap_invoke(msg, GSM0480_OP_CODE_USS_NOTIFY, 0);
+ gsm0480_wrap_facility(msg);
+
+ /* And finally pre-pend the L3 header */
+ gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
+ gh->proto_discr = GSM48_PDISC_NC_SS;
+ gh->msg_type = GSM0480_MTYPE_REGISTER;
+
+ return gsm0808_submit_dtap(conn, msg, 0, 0);
+}
+
+int gsm0480_send_releaseComplete(struct gsm_subscriber_connection *conn)
+{
+ struct gsm48_hdr *gh;
+ struct msgb *msg;
+
+ msg = gsm48_msgb_alloc();
+ if (!msg)
+ return -1;
+
+ gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
+ gh->proto_discr = GSM48_PDISC_NC_SS;
+ gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE;
+
+ return gsm0808_submit_dtap(conn, msg, 0, 0);
+}