--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sip-out/call_list.c	Tue Oct 11 23:04:01 2022 -0800
@@ -0,0 +1,80 @@
+/*
+ * In this module we implement call list management for 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/out_routes.h"
+#include "call.h"
+
+struct call *call_list;
+
+struct call *
+find_call_by_sip_id(sought_id)
+	char *sought_id;
+{
+	struct call *call;
+
+	for (call = call_list; call; call = call->next) {
+		if (!call->sip_call_exists)
+			continue;
+		if (!strcmp(call->sip_call_id, sought_id))
+			return call;
+	}
+	return 0;
+}
+
+struct call *
+find_call_by_mncc_callref(mncc, callref)
+	struct mncc_conn *mncc;
+	uint32_t callref;
+{
+	struct call *call;
+
+	for (call = call_list; call; call = call->next)
+		if (call->mncc == mncc && call->mncc_callref == callref)
+			return call;
+	return 0;
+}
+
+void
+scan_call_list_for_timeouts(retrans, dead_sip_flag, dead_sip_time)
+	int *retrans, *dead_sip_flag;
+	time_t *dead_sip_time;
+{
+	struct call *call;
+	int got_dead_sip = 0;
+
+	for (call = call_list; call; call = call->next) {
+		if (!call->sip_call_exists)
+			continue;
+		switch (call->sip_state) {
+		case SIP_STATE_INV_SENT:
+		case SIP_STATE_CANCEL_SENT:
+		case SIP_STATE_BYE_SENT:
+			*retrans = 1;
+			break;
+		case SIP_STATE_ACCEPT_100:
+		case SIP_STATE_ACCEPT_200:
+		case SIP_STATE_ENDED:
+			if (call->overall_state != OVERALL_STATE_SIP_FINISH)
+				continue;
+			if (got_dead_sip) {
+				if (call->sip_clear_time < *dead_sip_time)
+					*dead_sip_time = call->sip_clear_time;
+			} else {
+				got_dead_sip = 1;
+				*dead_sip_flag = 1;
+				*dead_sip_time = call->sip_clear_time;
+			}
+		}
+	}
+}