The Epygi QX20 IP PBX is a full-featured IP PBX designed for offices with as many as 32 users. The QX20 can support up to 32 IP devices and 10 concurrent calls. SIP trunking allows the QX20 to connect directly to an ITSP without additional equipment. The QX20 includes a firewall and SIP Intrusion Detection for optimal security. E1, T1, FXO, and FXS ports can easily be provided using the Epygi QX Gateways. You can get a fully functional, modular, and feature-rich IP PBX for a very reasonable price.