capifax: 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/capifax - from package: isdn4k-utils

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

On Debian possible default full paths are:

/usr/bin/capifax - from package: capiutils

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

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