/*
 * chan_oh323.h
 *
 * OpenH323 Channel Driver for ASTERISK PBX.
 *			By Jeremy McNamara
 * 			For The NuFone Network
 *	
 * This code has been derived from code created by 
 *		Michael Manousos and Mark Spencer
 *
 * This file is part of the chan_oh323 driver for Asterisk
 *
 * chan_oh323 is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version. 
 *
 * chan_oh323 is distributed WITHOUT ANY WARRANTY; without even 
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
 * PURPOSE. See the GNU General Public License for more details. 
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
 *
 */

#include <arpa/inet.h>

static struct sockaddr_in bindaddr;

/* structure to hold the valid asterisk users */
struct oh323_user {
	char name[80];
	char context[80];
	char secret[80];
	char callerid[80];
	char accountcode[20];
	int amaflags;
	int noFastStart;
	int noH245Tunneling;
	int noSilenceSuppression;
	int inUse;
	int incominglimit;
	int bridge;
	int nat;
	int dtmfmode;
	int host;
	struct ast_ha *ha;
	struct sockaddr_in addr;
	struct oh323_user *next;
};

/* structure to hold the valid asterisk peers 
   All peers are registered to a GK if there is one */
struct oh323_peer {
	char name[80];
	char context[80];
	int	noFastStart;
	int	noH245Tunneling;
	int	noSilenceSuppression;
	int inUse;
	int outgoinglimit;
	int bridge;
	int nat;
	int dtmfmode;
	struct sockaddr_in addr;
	int delme;
	struct oh323_peer *next;
};

/* structure to hold the H.323 aliases which get registered to 
   the H.323 endpoint and gatekeeper */
struct oh323_alias {
	char name[80];
	char e164[20];				/* tells a GK to route this E.164 to this alias */
	char prefix[500];			/* tells a GK this alias supports these prefixes */
	char secret[20];			/* the H.235 password to send to the GK for authentication */
	char context[80];
	struct oh323_alias *next;	
};

/** call_option struct is filled from the 
	PBX application and passed through make_call 
	function*/
typedef struct call_options {
	int				noFastStart;
	int				noH245Tunnelling;
	int				noSilenceSuppression;
	int				jitter;
	unsigned int	port;
} call_options_t;

/** call_details struct call detail records 
	to asterisk for processing and used for matching up 
	asterisk channels to acutal h.323 connections */
typedef struct call_details {	
	unsigned int call_reference;
	const char *call_token;				
	const char *call_source_aliases;
	const char *call_dest_alias;
	const char *call_source_e164;
	const char *call_dest_e164;
	const char *sourceIp;
} call_details_t;

/* This is a callback prototype function, called pass
   DTMF down the RTP. */
typedef int (*send_digit_cb)(unsigned, char);
send_digit_cb	on_send_digit; 

/* This is a callback prototype function, called to collect
   the external RTP port from Asterisk. */
typedef int (*on_connection_cb)(unsigned);
on_connection_cb	on_create_connection; 

/* This is a callback prototype function, called upon
   an incoming call happens. */
typedef int (*setup_incoming_cb)(call_details_t);
setup_incoming_cb		on_incoming_call;

/* This is a callback prototype function, called upon
   an outbound call. */
typedef int (*setup_outbound_cb)(call_details_t);
setup_outbound_cb	on_outgoing_call; 

/* This is a callback prototype function, called when the openh323 
   OnStartLogicalChannel is invoked. */
typedef void (*start_logchan_cb)(unsigned int, const char *, int);
start_logchan_cb	on_start_logical_channel; 

/* This is a callback protoype function, called when the openh323
   OnConnectionEstablished is inovked */
typedef void (*con_established_cb)(unsigned);
con_established_cb		on_connection_established;

/* This is a callback prototype function, called when the openH323
   OnConnectionCleared callback is invoked */
typedef void (*clear_con_cb)(call_details_t);
clear_con_cb		on_connection_cleared;

/* debug flag */
int h323debug;

#define H323_DTMF_RFC2833	(1 << 0)
#define H323_DTMF_INBAND	(1 << 1)

#ifdef __cplusplus
extern "C" {
#endif   
    
	void h323_gk_urq(void);
	void h323_end_point_create(void);
	void h323_end_process(void);
	int end_point_exist(void);
    
	void h323_debug(int, unsigned);

	/* callback function handler*/
	void h323_callback_register(setup_incoming_cb, setup_outbound_cb, on_connection_cb, start_logchan_cb, clear_con_cb, con_established_cb, send_digit_cb);

	int h323_set_capability(int, int);
	int h323_set_alias(struct oh323_alias *);
	int h323_set_gk(int, char *, char *);

	/* H323 listener related funcions */
	int h323_start_listener(int, struct sockaddr_in, int);

	void h323_native_bridge(const char *, char *, char *);

	/* Send a DTMF tone to remote endpoint */
	void h323_send_tone(const char *call_token, char tone);

	/* H323 create and destroy sessions */
	int h323_make_call(char *host, call_details_t *cd, call_options_t);
	int h323_clear_call(const char *);
	int h323_answering_call(const char *token, int);
	
	int h323_show_codec(int fd, int argc, char *argv[]);


#ifdef __cplusplus
}
#endif