The Quadro4xi is ideal for the small to medium size business locations with a higher need for IP Phone extensions. It is an IP router, SIP gateway and IP PBX all in one box. The Quadro4xi is equipped with four FXS ports for connection of standard analog POTS phones or fax machines.  Rack mountable with 3 BRI ports model. Thirty additional IP phones can be configured as SIP extensions. In addition, there are ISDN interfaces ports for connection to the PSTN. The ISDN capable Quadro IP PBXs are very versatile offering user mode connectivity to ISDN S0 circuits for voice traffic. The 4xi is available with one or three S0 port. With a built-in QoS router, LAN 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, and web browser configuration. In addition to the features of the 2x, the Quadro4xi adds USB ports for voicemail memory expansion. With the purchase of a software key (SKU-QUADRO-0710), the Quadro4xi can expand to support 16 more IP phone extensions, bringing the total to 50 analog and IP extensions. One additional software key (SKU-QUADRO-0710) can be purchased to add 16 more IP phone extensions, bringing the total to 66 analog and IP extensions. One free Quadro Communications Manager license is included with the base system. Note: Now available free with every IP PBX 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.Please Note: The Quadro ISDN PBXs and all other ISDN based products are not supported in the USA. This product is intended for all other countries with large networks of ISDN based service providers. If you are unsure of support in your region, please contact Epygi Technologies directly to clarify support. 14"x 12"x 3" MFG# SKU-QUADRO-3800

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