It is nice to customize the telephony system to meet your needs. I got the idea from magi, an old patch written by david pollak that allowed agi execution thru the manager interface. Asterisk is the worlds leading opensource pbx, telephony engine, and telephony applications toolkit with immense flexibility. Every php based agi script takes the following form. Asterisk gateway interface agi the asterisk gateway interface is an interface for adding functionality to asterisk with many different programming languages like perl, php, c, pascal, bourne shell.
This is getting a bit outside the freepbx, so you would be better off looking for assistance from generic asterisk sitestutorials. My problem is syntax and logic how to past variable to asterisk and to work something with it. Although php provides facilities for creating nonblocking sockets, writing a multiclient tcp daemon using php isnt a simple task. One shortcut is to use agis verbose command to output text to the asterisk cli. The future of telephony outlines all the options, and shows you how to set up voicemail services, call conferencing, interactive voice response, call waiting, caller id, and more. Asterisk simple php lookup up callerid name from horde turba.
Asterisk is a software implementation of a private branch exchange pbx. A very simple phpagi example asterisk gateway interface 1. Yes, i know how to install everything, and i have it. The fundamentals of agi programming selection from asterisk. Asterisk fastagi with php enrico simonetti dot com. A very simple phpagi example asterisk gateway interface. Lately ive been involved in some work projects related to asterisk. Asterisk gateway interface scripting with php packt hub. Agi is a very simple protocol, and it has been implemented in a wide variety of languages, allowing to quickly create telephony applications, like ivr s, voicemails, prepaid telephony systems, etc.
Asterisk gateway interface agi is a software interface and communications protocol for application level control of selected features of the asterisk pbx agi allows an external, userwritten program, launched from the asterisk dial plan via pipes to control telephony operations on its associated control and voice channels. The asterisk gateway interface, or agi, provides a standard interface by which external programs may control the asterisk dialplan. Very suitable for development of operator consoles and or asterisk channels peers monitoring through soa, etc. It allows programmers to write simple programs to manipulate and route calls on asterisk servers in a simple, easy manner this article provides a technical introduction to the agi, explaining how it works, how it can. Asteriskagi simple asterisk gateway interface class.
Lets step through the file while we cover the core concepts of agi programming. In general, the interface is synchronous actions taken on a channel from an agi block and do not return until the action is completed. You can rate examples to help us improve the quality of examples. While this particular script is written in perl, please remember that your own agi programs may be written in almost any programming language. Debugging your agi no way around it, debugging an agi is a pain. It allows programmers to write simple programs to manipulate and route calls on asterisk servers in a simple, easy manner. Agi scripts or programs can be implemented in almost any conceivable language e.
It is similar to the cgi feature of web servers in allowing any. The program is offered at the end of the asterisk advanced training course. Asterisk gateway interface agi asterisk manager api ami. In conjunction with suitable telephony hardware interfaces and network applications, asterisk is used to establish and control telephone calls between telecommunication endpoints, such as customary telephone sets, destinations on the public switched telephone network pstn, and devices or services on voice over internet. This section discusses what steps are taken at the beginning of an agi session for the different variants of agi. Runs an asterisk gateway interface compliant program called program on the current channel. Agi provides an interface between the asterisk dialplan and an external program that wants to manipulate a channel in the dialplan. I am going to develop a call manager system website that will communicate with asterisk servers. I had the opportunity to play with the asterisk gateway interface agi to see what can be done with it in a few words, it allows you to execute scripts on an action eg.
Since then, weve received multiple contributions from people, specifically code segments that illustrated that weve over restricted the access to the asterisk ari interface. Phpagi is a php class for the asterisk gateway interface. Weve now covered two different languages in order to demonstrate the similarities and differences of programming an agi script in php as opposed to perl. Asterisk agi file for a freepbx system that examines outbound dialed digits against inbound dids specified in inbound routes. A technical introduction to the asterisk gateway interface agi the asterisk gateway interface, commonly referred to as agi, is a languageindependent api for processing calls.
The framework to create ivr and voip applications in php for the asterisk pbx. Dont place any whitespace after the closing php tag, as it can confuse the agi interface. One of the cool features of asterisk is agi scripting. Agi is the asterisk gateway interface, an interface for adding various functionality to asterisk with many different programming languages such as perl, php, c, pascal, bourne shell, etc. Ive started with the asterisk simple php lookup mysql database to set callerid name. Get started with agi development and use the dynamic features of asterisk agi to build your own voipbased telephony system. Agi is a very simple protocol, and it has been implemented in a wide variety of languages, allowing to quickly create telephony applications, like ivrs, voicemails, prepaid telephony systems, etc. They can take care of arbitrary instantaneous tasks in tight collaboration with asterisk. Once agi or eagi has been invoked from the asterisk dialplan, some information is passed to the agi application to set up the agi session. Dont forget to grant execution rights to your script chmod 755 yourscript. Use code metacpan10 at checkout to apply your discount. From the agi script pointofview, any input coming in from asterisk would be considered stdin, while output to asterisk would be considered as stdout. It will be developed in php, i have been googling around and i notice there are a few opensource asterisk php library like phpagi. Download it once and read it on your kindle device, pc, phones or tablets.
Php asterisk manager interface ami supports synchronous command action responses and asynchronous events using the pattern observerlistener. This book will give you a firm understanding of asterisk gateway interface agi development and proper agi development practices. If you are willing to learn more here i am writing this small tutorial to describe how to create a php agi to customize the asterisk telephony engine as you like. In general, these scripts are known as the asterisk gateway interface or agi. Get ideas for various asteriskbased services and applications that you can create. Asterisk php store locator lumenvox developer network. Please note that these will be in every agi that appears in this book. How to write php agi in asterisk part 1 by it markaz youtube. Make sure your php file is in varlibasteriskagibin and has similar ownership and permissions to other agibin files in particular, that user and group are both asterisk.
Lets examine the agi script weve just seen lines 15. This book explains how to program scripts that link into asterisk, with an emphasis on php scripting. How to write php agi in asterisk part 2 by it markaz youtube. Create agi applications with asterisk easily using phpagi, a php class library avoid going through the normal pitfalls of novice developers when developing asteriskbased applications and services for the first time develop agi scripts and fastagi servers using asteriskperl modules. Use features like bookmarks, note taking and highlighting while reading asterisk gateway interface 1. These provide a generic startup for our agi script. Check the site for help on how to do that, including how to use the php agi. In this video we will see how you ca write your own agi scripts to get cdr from asterisk. As the previous diagram illustrates, an agi script communicates with asterisk via two standard data streamsstdin standard input and stdout standard output. With the introduction of ari, these developers had been left out, specifically with everything related to developing stasis applications. With asterisk dial plan, it can be used to redirect outbound calls back in for local dids. Phpagi is built from 3 different classes for programming agi scripts. Asterisk 14 now has the ability to publish extension state using pjsip publish requests to another entity acting as an event state compositor. Agi execution environment you can pass arguments to an agi script, like so.
It aims to be a practical approach, tutorial, and howto about agi, helpful to learn how to make asterisk agi applications. Asterisk comes with a sample agi script called agi test. The following things should be remembered when writing an agi script in php. Turning over control of the dialplan to an external agi script enables asterisk to easily perform tasks that would otherwise be difficult or impossible. Writing php agis general help freepbx community forums. If you are unfamiliar with these, consult with your system administrator for additional information. I have been coding some new stuff for asterisk lately, but the feature i like the most is asynchronous agi. The digiumcertified asterisk professional dcap certification is a verification of your knowledge of asterisk. The agispeedy is an agi application server implemention in asterisk and written by pure php. All agi scripts should have the execute permission, and should be owned by the user running asterisk. The asterisk restful interface ari was created to address these concerns. Asterisk expects to find scripts in the varlibasteriskagibin directory for agi execution. It has been tested on asterisk 11, but should work on any version of asterisk that is supported by the unimrcp for asterisk module.
As a valued partner and proud supporter of metacpan, stickeryou is happy to offer a 10% discount on all custom stickers, business labels, roll labels, vinyl lettering or custom decals. Asterisk pbx configuration for your agi telephony applications. We promised wed cover several languages, so lets go ahead and see what an agi script in php looks like. It is very similar to cgi common gateway interface which is one of the first forms of web development. Phpagi was originally written by matthew asham and has been fixed, tweaked and molded. Asterisk communicate with the applications through their standard input stdin and standard output stdout. Perl, php and may be used to manipulate the channel, play sound files, interpret dtmf tones, and so on. Php agi asterisk gateway interface facade, with cdr call detail record, call spool and schedule auto dial, send and receive fax, channel variables, and caller id management marcelogpagi. Creating agi scripts in php we promised wed cover several languages, so lets go ahead and see what an agi script in php looks like. In this talk well discuss how to redevelop the asterisk dial application. Common problems agi scripts live in varlibasteriskagibin php script must be executable by the user asterisk is running as usually asterisk. I wanted to lookup the callerid in the horde turba address book so that users could easily. While ami is good at call control and agi is good at allowing a remote process to execute dialplan applications, neither of these apis was designed to let a developer build their own custom communications application. The application is largely an asterisk gateway interface agi script written in php.
Turning over control of the dialplan to an external agi script enables asterisk to easily perform tasks. Usually, agi scripts are used to do advanced logic, communicate with relational databases such as postgresql or mysql, and access other external resources. Supports commands with responses with multiple events. Asterisk communicates with the agi program over stdin and stdout. If this is not a good assumption in your case, may i highly suggest the asterisk tutorial at, or even better, the oreilly asterisk book, which is a little. A technical introduction to the asterisk gateway interface. For larger installations, the advantage of this ability is to offload from asterisk the subscribe and notify responsibility for state changes. The certification covers a specific released, stable version of asterisk.
The path is relative to the asterisk agi directory, which is at varlibasteriskagibin by default. Youll also learn how asterisk merges voice and data traffic seamlessly across disparate networks. How to write php agi in asterisk part 1 by it markaz. Overview of the agi asterisk gateway interface protocol. The package is available for use and distribution under the terms of the gnu public license. Agi scripting with python agi stands for asterisk gateway interface.