--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sip-out/call.h	Tue Oct 11 23:04:01 2022 -0800
@@ -0,0 +1,90 @@
+/*
+ * In this header file we define two key structures for call state
+ * in themwi-sip-out: struct call exists for each call just like in
+ * themwi-sip-in, and struct mncc_conn exists for every connection
+ * to our outcall socket.
+ */
+
+struct mncc_conn {
+	int		fd;
+	struct mncc_conn *next;
+};
+
+#define	MAX_SIP_CALL_ID		30
+#define	MAX_SIP_FROM_HEADER	(MAX_SIP_USER_PART + 5 + 17 + 5 + 8)
+#define	MAX_SIP_TO_URI		(MAX_SIP_USER_PART + MAX_SIP_DEST_DOMAIN + 5)
+#define	MAX_SIP_TO_TAG		63
+
+struct call {
+	/* global call list */
+	struct call	*next;
+	char		sip_call_id[MAX_SIP_CALL_ID+1];
+	int		sip_call_exists;
+	/* MNCC call origin */
+	struct mncc_conn *mncc;
+	uint32_t	mncc_callref;
+	/* call routing info */
+	char		from_user[MAX_SIP_USER_PART+1];
+	char		from_header[MAX_SIP_FROM_HEADER+1];
+	char		to_uri[MAX_SIP_TO_URI+1];
+	char		to_tag[MAX_SIP_TO_TAG+1];
+	struct sockaddr_in udp_sin;
+	/* PSTN side RTP info */
+	struct sockaddr_in pstn_rtp_local;
+	struct sockaddr_in pstn_rtp_remote;
+	int		use_pcma;
+	/* GSM side RTP info */
+	struct sockaddr_storage gsm_rtp_osmo;
+	struct sockaddr_storage gsm_rtp_tmgw;
+	uint32_t	gsm_payload_type;
+	uint32_t	gsm_payload_msg_type;
+	/* state machines */
+	uint32_t	overall_state;
+	uint32_t	mncc_state;
+	uint32_t	sip_state;
+	uint32_t	mgw_state;
+	uint32_t	mgw_ep_id;
+	uint32_t	mgw_xact;
+	uint32_t	mgw_xact_id;
+	unsigned	sip_tx_count;
+	time_t		sip_clear_time;
+	int		dtmf_digit;
+	int		dtmf_pending_stop;
+};
+
+#define	OVERALL_STATE_GSM_RTP		1
+#define	OVERALL_STATE_CRCX		2
+#define	OVERALL_STATE_SIP_OUT		3
+#define	OVERALL_STATE_RINGING		4
+#define	OVERALL_STATE_CONNECTED		5
+#define	OVERALL_STATE_TEARDOWN		6
+#define	OVERALL_STATE_SIP_FINISH	7
+#define	OVERALL_STATE_GC		8
+
+#define	MNCC_STATE_MO_PROC		1
+#define	MNCC_STATE_GOT_RTP		2
+#define	MNCC_STATE_ALERTING		3
+#define	MNCC_STATE_CONNECTED		4
+#define	MNCC_STATE_DISCONNECT		5
+#define	MNCC_STATE_RELEASE		6
+
+#define	SIP_STATE_INV_SENT		1
+#define	SIP_STATE_100_RCVD		2
+#define	SIP_STATE_CONNECTED		3
+#define	SIP_STATE_CANCEL_SENT		4
+#define	SIP_STATE_BYE_SENT		5
+#define	SIP_STATE_ACCEPT_100		6
+#define	SIP_STATE_ACCEPT_200		7
+#define	SIP_STATE_ENDED			8
+
+#define	MGW_STATE_NO_EXIST		0
+#define	MGW_STATE_ALLOCATED		1
+#define	MGW_STATE_IBT_CONN		2
+#define	MGW_STATE_COMPLETE		3
+#define	MGW_STATE_HELD			4
+#define	MGW_STATE_MDCX_IBT		5
+#define	MGW_STATE_MDCX_CONN		6
+#define	MGW_STATE_MDCX_HOLD		7
+#define	MGW_STATE_MDCX_RETR		8
+#define	MGW_STATE_DTMF_OP		9
+#define	MGW_STATE_DELETING		10