click the download http://www.voipdiscount.com/en/download.html sign, download it and install it on your notebook, run it, from there you can register into voipdiscount.
after registered, delete the software from your CONTROL Panel. then register the voipdiscount at your SPA2001.
for get IPKALL number see here http://blog.wenxuecity.com/blogview.php?date=201012&postID=16541