Convert Audio Files for Asterisk

To convert a file compatible with Asterisk, Mono 8khz
This will convert a mp3 file to wav

mpg123 -r 8000 -w or-disable.wav or-disable.mp3

Convert all files in a folder.
This will convert all mp3 files to wav and then delete the mp3 file.

for filename in *.mp3; do mpg123 -r 8000 -w  ${filename%%????}.wav ${filename}; rm -f ${filename}; done