diff --git a/src/libmsc/msc_ifaces.c b/src/libmsc/msc_ifaces.c
new file mode 100644
index 0000000..001fcba
--- /dev/null
+++ b/src/libmsc/msc_ifaces.c
@@ -0,0 +1,84 @@
+/* Implementation for MSC decisions which interface to send messages out on. */
+
+/* (C) 2016 by sysmocom s.m.f.c GmbH <info@sysmocom.de>
+ *
+ * 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 <osmocom/core/logging.h>
+
+#include <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/msc_ifaces.h>
+
+static int msc_tx(struct gsm_subscriber_connection *conn, struct msgb *msg)
+{
+	switch (conn->via_ran) {
+	/* FUTURE 
+	case RAN_GERAN_A:
+		msg->dst = conn;
+		return a_tx(msg);
+
+	case RAN_UTRAN_IU:
+		msg->dst = conn->iu.ue_ctx;
+		return iu_tx(msg, 0);
+	*/
+	default:
+		LOGP(DMSC, LOGL_ERROR,
+		     "msc_tx(): conn->via_ran invalid (%d)\n",
+		     conn->via_ran);
+		return -1;
+	}
+}
+
+
+int msc_tx_dtap(struct gsm_subscriber_connection *conn,
+		struct msgb *msg)
+{
+	return msc_tx(conn, msg);
+}
+
+
+/* 9.2.5 CM service accept */
+int msc_gsm48_tx_mm_serv_ack(struct gsm_subscriber_connection *conn)
+{
+	struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERV ACC");
+	struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+
+	gh->proto_discr = GSM48_PDISC_MM;
+	gh->msg_type = GSM48_MT_MM_CM_SERV_ACC;
+
+	DEBUGP(DMM, "-> CM SERVICE ACCEPT\n");
+
+	return msc_tx_dtap(conn, msg);
+}
+
+/* 9.2.6 CM service reject */
+int msc_gsm48_tx_mm_serv_rej(struct gsm_subscriber_connection *conn,
+			     enum gsm48_reject_value value)
+{
+	struct msgb *msg;
+
+	msg = gsm48_create_mm_serv_rej(value);
+	if (!msg) {
+		LOGP(DMM, LOGL_ERROR, "Failed to allocate CM Service Reject.\n");
+		return -1;
+	}
+
+	DEBUGP(DMM, "-> CM SERVICE Reject cause: %d\n", value);
+
+	return msc_tx_dtap(conn, msg);
+}