ekiga-helper: 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/ekiga-helper - from package: ekiga

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

On Debian possible default full paths are:

/usr/bin/ekiga-helper - from package: ekiga

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

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