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    /*
    
     * Asterisk -- An open source telephony toolkit.
    
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     *
    
     * Copyright (C) 1999 - 2005, Digium, Inc.
    
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     *
    
     * Mark Spencer <markster@digium.com>
    
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     *
    
     * See http://www.asterisk.org for more information about
     * the Asterisk project. Please do not directly contact
     * any of the maintainers of this project for assistance;
     * the project provides a web site, mailing lists and IRC
     * channels for your use.
     *
    
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     * This program is free software, distributed under the terms of
    
     * the GNU General Public License Version 2. See the LICENSE file
     * at the top of the source tree.
     */
    
    
     * \brief Playback the special information tone to get rid of telemarketers
    
     *
     * \author Mark Spencer <markster@digium.com>
    
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     * \ingroup applications
    
    #include "asterisk.h"
    
    ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
    
    
    #include <stdlib.h>
    #include <stdio.h>
    #include <string.h>
    
    
    #include "asterisk/lock.h"
    #include "asterisk/file.h"
    #include "asterisk/logger.h"
    #include "asterisk/channel.h"
    #include "asterisk/pbx.h"
    #include "asterisk/module.h"
    #include "asterisk/translate.h"
    
    #include "asterisk/app.h"
    
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    static char *app = "Zapateller";
    
    static char *synopsis = "Block telemarketers with SIT";
    
    static char *descrip = 
    
    "  Zapateller(options):  Generates special information tone to block\n"
    
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    "telemarketers from calling you.  Options is a pipe-delimited list of\n" 
    "options.  The following options are available:\n"
    "'answer' causes the line to be answered before playing the tone,\n" 
    "'nocallerid' causes Zapateller to only play the tone if there\n"
    
    "is no callerid information available.  Options should be separated by |\n"
    "characters\n";
    
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    static int zapateller_exec(struct ast_channel *chan, void *data)
    {
    	int res = 0;
    
    	struct ast_module_user *u;
    
    	int i, answer = 0, nocallerid = 0;
    	char *parse = ast_strdupa((char *)data);
    	AST_DECLARE_APP_ARGS(args,
    		AST_APP_ARG(options)[2];
    	);
    
    
    	u = ast_module_user_add(chan);
    
    	AST_STANDARD_APP_ARGS(args, parse);
    
    	for (i = 0; i < args.argc; i++) {
    		if (!strcasecmp(args.options[i], "answer"))
    
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    			answer = 1;
    
    		else if (!strcasecmp(args.options[i], "nocallerid"))
    
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    			nocallerid = 1;
    
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    	ast_stopstream(chan);
    
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    	if (chan->_state != AST_STATE_UP) {
    
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    		if (answer) 
    
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    			res = ast_answer(chan);
    
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    			res = ast_safe_sleep(chan, 500);
    	}
    
    
    	if (!ast_strlen_zero(chan->cid.cid_num) && nocallerid) {
    
    		ast_module_user_remove(u);
    
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    		return res;
    	} 
    
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    	if (!res) 
    		res = ast_tonepair(chan, 950, 0, 330, 0);
    	if (!res) 
    		res = ast_tonepair(chan, 1400, 0, 330, 0);
    	if (!res) 
    		res = ast_tonepair(chan, 1800, 0, 330, 0);
    
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    	if (!res) 
    		res = ast_tonepair(chan, 0, 0, 1000, 0);
    
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    	return res;
    }
    
    
    static int unload_module(void)
    
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    {
    
    	ast_module_user_hangup_all();
    
    static int load_module(void)
    
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    {
    	return ast_register_application(app, zapateller_exec, synopsis, descrip);
    }
    
    
    AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Block Telemarketers with Special Information Tone");