ATech Machine LIBRA-02 M Informations techniques télécharger pdf (Page 514)

Pros of Enhanced AGI

It has the simplicity of process-based AGI, with the addition of a simple read-only

stream of the channel’s audio. This is the only variant that offers this feature.

Cons of Enhanced AGI

Since a new process must be spawned to run your application for every call, it has

the same efficiency concerns as regular process-based AGI.

For an alternative way of getting access to the audio outside of

Asterisk, consider using JACK. Asterisk has a module for JACK

integration, called app_jack. It provides the JACK() dialplan appli-

cation and the JACK_HOOK() dialplan function.

DeadAGI Is Dead

In versions of Asterisk prior to 1.8, there was a dialplan application called DeadAGI().

Its purpose was similar to that of AGI(), except you used it on a channel that had already

been hung up. This would usually be done in the special h extension, when you wanted

to use an AGI application to aid in some type of post-call processing. Invoking Dead

AGI() from the dialplan will still work, but you will get a WARNING message in the Asterisk

log. It has been deprecated in favor of using AGI() in all cases. The code for AGI() has

been updated so it knows how to correctly adjust its operation after a channel has been

hung up.

Pros of DeadAGI

None. It’s dead.

Cons of DeadAGI

It’s dead. Really, don’t use it. If you do, your configuration may break if Dead

AGI() is completely removed from Asterisk in a future version.

FastAGI—AGI over TCP

FastAGI is the term used for AGI call control over a TCP connection. With process-

based AGI, an instance of an AGI application is executed on the system for every call

and communication with that application is done over stdin and stdout. With FastAGI,

a TCP connection is made to a FastAGI server. Call control is done using the same AGI

protocol, but the communication is over the TCP connection and does not require a

new process to be started for every call. The AGI protocol is discussed in more detail

in “AGI Communication Overview” on page 480. Using FastAGI is much more scal-

able than process-based AGI, though it is also more complex to implement.

FastAGI is used by invoking the AGI() application in the Asterisk dialplan, but instead

of providing the name of the application to execute, you provide an agi:// URL. For

example:

exten => 1234,1,AGI(agi://127.0.0.1)

478 | Chapter 21: Asterisk Gateway Interface (AGI)

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