近期在研究asterisk的agi，因使用了perl去写脚本，故参考了voip-info的文章，
现将perl agi的模块转进来，以供日后参考。
以下为原文：
Asterisk perl agi
Asterisk::AGI perl module documentation
NAME
Asterisk::AGI – Simple Asterisk Gateway Interface Class
SYnopSIS
use Asterisk::AGI;
$AGI = new Asterisk::AGI;
# pull AGI variables into %input
%input = $AGI->ReadParse();
# say the number 1984
$AGI->say_number(1984);
DESCRIPTION
This module should make it easier to write scripts that interact with the asterisk open source pbx via AGI (aster�isk gateway interface)
CALLBACKS
Callbacks provide a handy way receiving events like hangups. To use the callback function,simply define a function to handle the callback and then tell Perl AGI which funtion it is by sending it a reference. Here is an example:
use Asterisk::AGI;
# the AGI object
my $agi = new Asterisk::AGI;
# send callback reference
$agi->setcallback(/&callback);
# our callback function
sub callback(){
warn “The call has ended/n”;
set_context($context);
exit;
}
AGI COMMANDS
* $AGI->stream_file($filename,$digits)
Executes AGI Command “STREAM FILE $filename $digits”
This command instructs Asterisk to play the given sound file and listen for the given dtmf digits. The fileextension must not be used in the filename because Asterisk will find the most appropriate file type.
Example: $AGI->stream_file(‘demo-echotest’,‘0123′);
Returns: -1 on error or hangup,0 if playback completes without a digit being pressed,or the ASCII numerical value of the digit if a digit was pressed.
* $AGI->send_text($text)
Executes AGI Command “SEND TEXT “$text”
Sends the given text on a channel. Most channels do not support the transmission of text.
Example: $AGI->send_text(‘You’ve got mail!’);
Returns: -1 on error or hangup,0 if the text was sent or if the channel does not support text transmission.
* $AGI->send_image($image)
Executes AGI Command “SEND IMAGE $image
Sends the given image on a channel. Most channels do not support the transmission of images.
Example: $AGI->send_image(‘image.png’);
Returns: -1 on error or hangup,0 if the image was sent or if the channel does not support image transmission.
* $AGI->say_number($number,$digits)
Executes AGI Command “SAY NUMBER $number $digits”
Says the given $number,returning early if any of the $digits are received.
Example: $AGI->say_number(‘98765′);
Returns: -1 on error or hangup,or the ASCII numerical value of the digit of one was pressed.
* $AGI->say_digits($number,$digits)
Executes AGI Command “SAY DIGITS $number $digits”
Says the given digit string $number,returning early if any of the $digits are received.
Example: $AGI->say_digits(‘8675309′);
Returns: -1 on error or hangup,or the ASCII numerical value of the digit of one was pressed.
* $AGI->answer()
Executes AGI Command “ANSWER”
Answers channel if not already in answer state.
Example: $AGI->answer();
Returns: -1 on channel failure,or 0 if successful.
* $AGI->get_data($filename,$timeout,$maxdigits)
Executes AGI Command “GET DATA $filename $timeout $maxdigits”
Streams $filename and returns when $maxdigits have been received or when $timeout has been reached. Timeout is specified in ms.
Example: $AGI->get_data(‘demo-welcome’,15000,5);
* $AGI->set_callerid($number)
Executes AGI Command “SET CALLERID $number”
Changes the callerid of the current channel to <number>.
Example: $AGI->set_callerid(‘9995551212′);
Returns: Always returns 1.
* $AGI->set_context($context)
Executes AGI Command “SET CONTEXT $context”
Changes the context for continuation upon exiting the agi application.
Example: $AGI->set_context(‘dialout’);
Returns: Always returns 0.
* $AGI->set_extension($extension)
Executes AGI Command “SET EXTENSION $extension”
Changes the extension for continuation upon exiting the agi application.
Example: $AGI->set_extension(‘7′);
Returns: Always returns 0.
* $AGI->set_priority($priority)
Executes AGI Command “SET PRIORITY $priority”
Changes the priority for continuation upon exiting the agi application.
Example: $AGI->set_priority(1);
Returns: Always returns 0.
* $AGI->hangup($channel)
Executes AGI Command “HANGUP $channel”
Hangs up the passed $channel,or the current channel if $channel is not passed. It is left to the AGI script to exit properly,otherwise you Could end up with zombies.
Example: $AGI->hangup();
Returns: Always returns 1.
* $AGI->exec($app,$options)
Executes AGI Command “EXEC $app $options”
The most powerful AGI command. Executes the given application passing the given options.
Example: $AGI->exec(‘Dial’,‘Zap/g2/8005551212′);
Returns: -2 on failure to find application,or what ever the given application returns.
* $AGI->set_variable($variable,$value)
Executes AGI Command “SET VARIABLE $variable $value”
Sets the channel variable <variablename> to <value>.
Example: $AGI->set_variable(’status’,‘authorized’);
Returns: Always returns 1.
* $AGI->get_variable($variable)
Executes AGI Command “GET VARIABLE $variablename”
Gets the channel variable <variablename>.
Example: $AGI->get_variable(’status’);
Returns: The value of the variable,or undef if variable does not exist.
* $AGI->verbose($message,$level)
Executes AGI Command “VERBOSE $message $level”
Logs $message with verboselevel $level.
Example: $AGI->verbose(“System Crashed/n”,1);
Returns: Always returns 1.
* $AGI->database_get($family,$key)
Executes AGI Command “DATABASE GET $family $key”
Example: $var = $AGI->database_get(‘test’,’status’);
Returns: The value of the variable,or undef if variable does not exist.
* $AGI->database_put($family,$key,$value)
Executes AGI Command “DATABASE PUT $family $key $value”
Set/modifes database entry <family>/<key> to <value>.
Example: $AGI->database_put(‘test’,’status’,‘authorized’);
Returns: 1 on success,0 otherwise.
* $AGI->database_del($family,$key)
Executes AGI Command “DATABASE DEL $family $key”
Removes database entry <family>/<key>.
Example: $AGI->database_del(‘test’,’status’);
Returns: 1 on success,0 otherwise.
* $AGI->database_deltree($family,$key)
Executes AGI Command “DATABASE DELTREE $family $key”
Deletes a family or specific keytree within a family in the Asterisk database.
Example: $AGI->database_deltree(‘test’,’status’);
Example: $AGI->database_deltree(‘test’);
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