kamctl: 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/sbin/kamctl - from package: kamailio

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

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