typedef struct Call	Call;typedef struct Cmd	Cmd;typedef struct Mname	Mname; #define	DISPSIZE	32 enum{	Altered = 1,	Xfrdial = 2,	Confdial = 4,	Spkrdial = 8}; struct Call{	int	state;	int	assoc;	ulong	flags;	int	id;	char *	dialp;	char	num[DISPSIZE];	char	who[DISPSIZE];	char	tty[DISPSIZE];	long	intime;	long	smail;	Call *	other;	int	confcount;}; #define	CMDSIZE	32 struct Cmd{	Cmd *	next;	char *	wptr;	char	buf[CMDSIZE];}; struct Mname{	int	msg;	char *	name;}; enum _Messages {	OK		= 0x0,	Connected	= 0x01,	Ring		= 0x02,	Cleared		= 0x03,	Error		= 0x4,	Delivered	= 0x05,	Display		= 0x06,	Busy		= 0x07,	Feature		= 0x08,	Proceeding	= 0x0a,	Progress	= 0x0b,	Prompt		= 0x0c,	Signal		= 0x0d,	Outcall		= 0x0e,	Completed	= 0x0f,	Rejected	= 0x10,	ATT_lamp	= 0x78,	ATT_tones	= 0x79,	Switchhook	= 0x7c,	Disconnect	= 0x7d,	L3_error	= 0x7e,	ATT_display	= 0x7f,	Associated	= 0x80,	ATT_cause	= 0x81,	ATT_HI		= 0x83,	Pro_phone	= 0x100,	API_phone	= 0x101,	Red_lamp	= 0x102,	Green_lamp	= 0x103}; 	/* Call states (table 4-7/Q.931, mostly) */ enum _Callstates {	Null		= 0,	Call_initiated	= 1,	Overlap_send	= 2,	Out_proceeding	= 3,	Call_delivered	= 4,	Call_present	= 6,	Call_received	= 7,	Connect_req	= 8,	In_proceeding	= 9,	Active		= 10,	Disconnect_req	= 11,	Disconnect_ind	= 12,	Suspend_req	= 15,	Suspended 	= ((16<<8)|Active),	Resume_req	= 17,	Release_req	= 19,	Call_abort	= 22,	Overlap_recv	= 25,	Transfer_req	= 30,	Query_req	= 35,}; 	/* Associated types (AT&T TR 801-802-100, sec. 8.2.3) */ #define	Asc_setup	0x05#define	Asc_connect	0x07#define	Asc_hold	0x08#define	Asc_reconn	0x0c#define	Asc_excl	0x0d#define	Asc_noconn	0x0e#define	Asc_noclear	0x0f 	/* switchhook flags */ #define	Off		0x01 #define	Sw_Handset	0x00#define	Sw_Adjunct	0x02#define	Sw_Speaker	0x04#define	Sw_Spokesman	0x06#define	Sw_Mute		0x08#define	Sw_Remote	0x0a #define	Handset		0x01#define	Adjunct		0x02#define	Speaker		0x04#define	Spokesman	0x08#define	Mute		0x10#define	Remote		0x20 	/* Display fields */ #define	Call_appear_id	0x01#define	Called_id	0x02#define	Calling_id	0x03#define	Calling_name	0x05#define	Isdn_call_id	0x07#define Dir_info	0x09#define	Date_Time	0x0a 	/* Buttons (API only) */ #define	B_Shifted	0x8000#define	B_Group 	0x7f00#define	B_Number 	0x00ff#define	B_Keypad	0x0200#define	B_Fixed		0x0300#define	B_Local		0x0400#define	B_Clock		(B_Shifted|B_Fixed|3)#define	B_Normal	(B_Local|0)#define	B_Mute		(B_Local|1)#define	B_Select	(B_Local|2) extern Mname	M_Messages[];extern Mname	M_Callstates[]; extern char	helptext[]; extern Call	calls[];extern Call *	callsN; extern char *	fname;extern char *	dsrvname;extern char *	srvname;extern int	pipefd[];extern char *	shname;extern char *	telcmd;extern int	debug;extern int	apiflag;extern char *	dialcmd;extern char *	dquerycmd;extern int	Startquery;extern int	Nextquery;extern int	fonefd;extern int	fonectlfd;extern int	cmdpending;