Asterisk utilizes a variety of sound prompts that are available in several file
formats and languages. Multiple languages and formats can be installed on the
same system, and Asterisk will utilize prompts from languages installed, and
will automatically pick the least CPU intensive format that is available on the
system (based on codecs in use, in additional to the codec and format modules
installed and available).
In addition to the prompts available with Asterisk, you can create your own sets
of prompts and utilize them as well. This document will tell you how the prompts
available for Asterisk are created so that the prompts you create can be as close
and consistent in the quality and volume levels as those shipped with Asterisk.
lmadsen
2010-10-21