Use Proxies in Windows
100% Working......
1)phone modem options
2)advanced
3)In Providers, click Microsoft H.323 Telephony Service Provider, and then click Configure.
4)In Configure H.323 Service Provider
5)To specify an H.323 proxy, select the Use H.323 proxy, and then type the server name or IP address for the proxy.
Try google for available proxy IP /servers...
Or
try www.proxy4free.com
this is a easy way of using private proxy with windows... plus its more secure than public CGI ones :D