The Quadro16x is ideal for the small to medium businesses with a higher need for FXS extensions. It is an IP router, SIP gateway and IP PBX all in one box. The Quadro16x is equipped with 16 FXS ports for connection of standard analog POTS phones or fax machines. 18 additional SIP IP phones can be configured as local extensions. In addition, there are 4 FXO ports for connection to the PSTN. With a built-in QoS router, LAN and voice traffic can be routed to the Internet, eliminating the need for an additional IP router. The Quadro incorporates a stateful inspection firewall, NAT, DHCP client and server, IPSec VPN, and web browser configuration. With the purchase of a software key, the Quadro16x can expand to support 16 more IP phone extensions, bringing the total to 50 analog and IP extensions. One additional software key can be purchased to add 16 more IP phone extensions, brining the total to 66 analog and IP extensions. Note: One free Epygi softphone, the Quadro Communications Manager (QCM), license is included with the base system. The Quadro 16x includes 18 IP Phone ports and 16 FXS ports. Two expansion keys of 16 ports each can be incrementally purchased to increase the system to a maximum of 50 IP Phone extensions for a total of 66 extensions.Now available free with every IP IPBX is the HotCall feature. This plug-in gives Outlook users the ability to click-to-call directly from Outlook and handle incoming calls on their PC.