Currently Voptop gets proxy support implemented. So far "Socks 5" proxy support is done and works fine with Linux based operating Systems and partly with Windows. Partly because on Windows there is a little problem with the libnice version Voptop is using. To solve the problem, I will make a rebuild of libnice from the latest source repository on Windows (that means, porting the latest version of libnice to Windows). I hope this will be achieved this week.
Furthermore Voptop should get proxy support through HTTP proxy's.
Socks 5: https://en.wikipedia.org/wiki/SOCKS