roardtmf: 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 Debian possible default full paths are:

/usr/bin/roardtmf - from package: roarclients

You may install the required package with command apt-get install {package}

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