sip-options: 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/sip-options - from package: sofia-sip-bin

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

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