ktp-dialout-ui: 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/ktp-dialout-ui - from package: kde-telepathy-call-ui

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

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