kamdbctl: command not found

Have You tried accessing the binary with the full path?

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/sbin/kamdbctl - from package: kamailio

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