stereorize: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/sbin/stereorize - from package: asterisk

You may install the required package with command yum install {package}

Error in other languages:
stereorize: bevel nie gevind nie
stereorize: comandă negăsită
stereorize: comando não encontrado
stereorize: commande introuvable
stereorize: command not found
stereorize: käsku ei ole
stereorize: không tìm thấy lệnh
stereorize: komanda nerasta
stereorize: Kommando nicht gefunden.
stereorize: kommandot finns inte
stereorize: komut yok
stereorize: nie znaleziono polecenia
stereorize: níor aimsíodh an t-ordú
stereorize: no se encontró la orden
stereorize: no s'ha trobat l'ordre
stereorize: opdracht niet gevonden
stereorize: parancs nem található
stereorize: perintah tidak ditemukan
stereorize: príkaz nenájdený
stereorize: příkaz nenalezen
stereorize: команда не найдена
stereorize: командата не е открита
stereorize: 命令找不到
stereorize: コマンドが見つかりません