The Cisco IP/VC 3525 Videoconferencing Gateway -- also available as a desktop or rack-mountable unit -- is a device that translates between H.323 and H.320 protocols. This gateway lets users interconnect IP-based H.323 networks consisting of LAN-attached videoconference endpoints with legacy ISDN-based H.320 systems. The Cisco IP/VC 3525 Gateway also offers a single Primary Rate Interface (PRI) to the Public Switched Telephone Network (PSTN). It is configurable for T1 or E1 connections, making it suitable for deployment anywhere in the world.