--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sip-in/mncc_sig_out.c	Tue Oct 11 16:23:44 2022 -0800
@@ -0,0 +1,96 @@
+/*
+ * In this module we implement functions that send MNCC messages
+ * to OsmoMSC via themwi-mncc, to be called by SIP and TMGW events.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <syslog.h>
+#include "../include/mncc.h"
+#include "../include/gsm48_const.h"
+#include "call.h"
+
+void
+send_mncc_connect_ack(call)
+	struct call *call;
+{
+	struct gsm_mncc ack;
+
+	bzero(&ack, sizeof(struct gsm_mncc));
+	ack.msg_type = MNCC_SETUP_COMPL_REQ;
+	ack.callref = call->mncc_callref;
+	send_mncc_to_gsm(&ack, sizeof(struct gsm_mncc));
+	call->mncc_state = MNCC_STATE_CONNECTED;
+	call->overall_state = OVERALL_STATE_CONNECTED;
+}
+
+void
+mncc_dtmf_start_ok(call)
+	struct call *call;
+{
+	struct gsm_mncc msg;
+
+	bzero(&msg, sizeof(struct gsm_mncc));
+	msg.msg_type = MNCC_START_DTMF_RSP;
+	msg.callref = call->mncc_callref;
+	msg.fields |= MNCC_F_KEYPAD;
+	msg.keypad = call->dtmf_digit;
+	send_mncc_to_gsm(&msg, sizeof(struct gsm_mncc));
+}
+
+void
+mncc_dtmf_start_err(call)
+	struct call *call;
+{
+	struct gsm_mncc msg;
+
+	bzero(&msg, sizeof(struct gsm_mncc));
+	msg.msg_type = MNCC_START_DTMF_REJ;
+	msg.callref = call->mncc_callref;
+	mncc_set_cause(&msg, GSM48_CAUSE_LOC_PRN_S_LU,
+			GSM48_CC_CAUSE_PROTO_ERR);
+	send_mncc_to_gsm(&msg, sizeof(struct gsm_mncc));
+}
+
+void
+mncc_dtmf_stop_ok(call)
+	struct call *call;
+{
+	struct gsm_mncc msg;
+
+	bzero(&msg, sizeof(struct gsm_mncc));
+	msg.msg_type = MNCC_STOP_DTMF_RSP;
+	msg.callref = call->mncc_callref;
+	send_mncc_to_gsm(&msg, sizeof(struct gsm_mncc));
+}
+
+void
+mncc_send_hold_ack(call)
+	struct call *call;
+{
+	struct gsm_mncc msg;
+
+	bzero(&msg, sizeof(struct gsm_mncc));
+	msg.msg_type = MNCC_HOLD_CNF;
+	msg.callref = call->mncc_callref;
+	send_mncc_to_gsm(&msg, sizeof(struct gsm_mncc));
+}
+
+void
+mncc_send_retrieve_ack(call)
+	struct call *call;
+{
+	struct gsm_mncc msg;
+
+	bzero(&msg, sizeof(struct gsm_mncc));
+	msg.msg_type = MNCC_RETRIEVE_CNF;
+	msg.callref = call->mncc_callref;
+	send_mncc_to_gsm(&msg, sizeof(struct gsm_mncc));
+}