Asterisk convert sounds

ls -1| awk -F. ' {print $1}'| xargs -n 1 --replace=$ sox -r 6000 $.vox -r 8000 $.gsm resample -ql
ls -1| awk -F. ' {print $1}'| xargs -n 1 --replace=$ astconv /usr/lib64/asterisk/modules/codec_g729.so -e 160  $.alaw $.g729