They are created from the netinstaller with the latest Debian 8 Jessie OS and the following packages
1. Asterisk 11 with chan_dongle support, codec g729 and silk, switchfin gui
2. Remote desktop support by tightvncserver and xrdp; xterminal desktop 用了XFCE4
3. VPN support by pptpd, softether (openvpn, sstp), ocserv, Adito (OpenVPN-ALS), StrongSWAN
4. Apache with reverse proxy support for web server
5. Mysql server
6. Kamailio sip proxy
7. Iptables with spamtables for blacklist sites
8. Webmin for server management