playSIP: 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/playSIP - from package: livemedia-utils

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

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