--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sip-out/shutdown.c	Tue Oct 11 23:04:01 2022 -0800
@@ -0,0 +1,63 @@
+/*
+ * In this module we handle the scenarios of themwi-mncc and/or themwi-mgw
+ * shutting down while we are connected to them.  In both scenarios we
+ * terminate all active calls (in the case of MNCC socket closing, only
+ * those calls that came on that socket), but our themwi-sip-out process
+ * itself stays running.  This way once the other required processes restart,
+ * outbound calls will start working once again, without needing to restart
+ * themwi-sip-out.
+ */
+
+#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 "../include/out_routes.h"
+#include "call.h"
+
+extern struct call *call_list;
+
+void
+shutdown_mncc_socket(mncc)
+	struct mncc_conn *mncc;
+{
+	struct call *call;
+
+	for (call = call_list; call; call = call->next) {
+		if (call->mncc != mncc)
+			continue;
+		call->mncc = 0;
+		if (call->overall_state < OVERALL_STATE_TEARDOWN) {
+			call->overall_state = OVERALL_STATE_TEARDOWN;
+			disconnect_tmgw(call);
+			disconnect_sip(call);
+			check_dead_call(call);
+		}
+	}
+}
+
+void
+shutdown_mgw_conn()
+{
+	struct call *call;
+
+	for (call = call_list; call; call = call->next) {
+		call->mgw_state = MGW_STATE_NO_EXIST;
+		call->mgw_xact = 0;
+		if (call->overall_state < OVERALL_STATE_TEARDOWN) {
+			call->overall_state = OVERALL_STATE_TEARDOWN;
+			disconnect_mncc(call, GSM48_CAUSE_LOC_PRN_S_LU,
+					GSM48_CC_CAUSE_NETWORK_OOO);
+			disconnect_sip(call);
+			check_dead_call(call);
+		}
+	}
+}