To change your server name follow these steps;
1.) Login to the web control-panel, http://control.branzone.com
2.) Browse to; Voice Servers > YOUR_SERVER > Voice Server Configuration
3.) Once in the configuration page select to edit the "ventrilo_srv.ini" file.
You will then see the option to change your server name at the top of the configuration page. Once you have saved the changes you will need to restart your server for the new name to take affect.