conf2ael: 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/conf2ael - from package: asterisk

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

Error in other languages:
conf2ael: bevel nie gevind nie
conf2ael: comandă negăsită
conf2ael: comando não encontrado
conf2ael: commande introuvable
conf2ael: command not found
conf2ael: käsku ei ole
conf2ael: không tìm thấy lệnh
conf2ael: komanda nerasta
conf2ael: Kommando nicht gefunden.
conf2ael: kommandot finns inte
conf2ael: komut yok
conf2ael: nie znaleziono polecenia
conf2ael: níor aimsíodh an t-ordú
conf2ael: no se encontró la orden
conf2ael: no s'ha trobat l'ordre
conf2ael: opdracht niet gevonden
conf2ael: parancs nem található
conf2ael: perintah tidak ditemukan
conf2ael: príkaz nenájdený
conf2ael: příkaz nenalezen
conf2ael: команда не найдена
conf2ael: командата не е открита
conf2ael: 命令找不到
conf2ael: コマンドが見つかりません