I have a system which gets direct Internet. I have a server which is on LAN which I use for VOIP calling. Any Proxy software which can block HTTP but Not Skype and 5060 port ?
Don't know about proxy much but i can recommend you vpn service. I used hidemyass vpn service to unblock every site. It also anonymize my identity.
Some times Proxies cant work properly, you should use any bestVPNservice.com. VPN Protocols can blocked any ports or websites which you dont want to allow access. To know about Proxy Servers visit this: bestvpnservice.com/blog/proxy-vs-vpn-services-difference-between-proxy-vpn
Hmm well not sure about proxy that it can unblock all websites and application like skype. You can use VPN which will surely unblock websites and allow you to use skype as well. to get some experience with it i will advice you to use free trail version
If you get a linux box and run a proxy on it, yes you can allow skype to still run you just have to configure the ports in iptables.