The Zy WALL USG-20 series is a high-performance, deep packet inspection anti-spam features in one box. The multi-layered security safeguards your organizations customers & company records, intellectual property as well as critical resources from external & internal threats. The Zy WALL USG (Unified Security Gateway) 20 provides greater performance protection as well as a deep packet inspection security solution for small businesses to enterprises alike. It embodies a Stateful Packet Inspection (SPI) firewall, content filtering, anti-spam, & VPN (IPSec/SSL) in one box.