For those of you who need accounts to test their own SER proxies from outside their domains I have setup this easy registration service

http://sip2sip.info

You get a SIP account under sip2sip plus a UPT +87810 ENUM number and you may call outside local domain with it. There are some mediaproxies that do the NAT traversal, video streams included.

And BTW check the SNOM software phone from http://snom.com/download/snom360-3.60j.exe it is by far the easiest SIP software I had configured on my desktop.

Regards, Adrian