asterisk-gvoice-setup: 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/bin/asterisk-gvoice-setup - from package: python-googlevoice

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

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