System information

• Channel drivers
• Codec translators
• Format interpreters
• Dialplan functions
• PBX modules
• Resource modules
• Addons modules
• Test modules
In the following sections we will list each module available within these categories,
briefly identify its purpose, and give our opinion on its relative popularity and/or im-
portance (while some modules are proven and deservedly popular, others are quite old,
are barely ever used anymore, and are only maintained for the purpose of backward-
compatibility). The details of how specific modules work will be covered in various
chapters throughout the book, depending on what the module is and what it does.
Some modules will be covered thoroughly; others may not be covered at all.
Regarding the Popularity/Status column in the tables that follow, the following list
contains our opinions with respect to the meanings we have chosen (your mileage may
vary):
Insignificant
This module is ancient history. If you use it, be aware that you are mostly on your
own when it comes to any sort of community support.
Unreliable
This module is new or experimental, and is not suitable for production.
Useful
This module is current, maintained, popular, and recommended.
Usable
This module works but may be incomplete or unpopular, and/or is not recom-
mended by the authors.
New
This module is quite new, and its completeness and popularity are difficult to gauge
at this time.
Deprecated
This module has been replaced by something that is considered superior.
Limited
This module has limitations that may make it unsuitable to your requirements.
Essential
This module is one you’ll never want to be without.
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