Panasonic KX-NS5290 is a card for conneting ISDN or PRI lines. The card has been designed to work with network servers KX-NS500, KX-NS700 and their expansions KX-NS520 and KX-NS720. The device allows you to connect an ISDN line or E1 PRI(up to 4 connections). Allows you to connect a 30-channel PRI/ISDN line as external or internal DDI service line or even as a private QSIG networking line. The device is connected by a RJ45 socket. Includes a PRI30 card and mounting hardware. ISDN PRI Route Connects ISDN/ E1 PRI Line Allows 30-Channel Line Connection as 1 RJ45 Socket Includes PRI30 Card & Mounting Hardware Works With The Following Systems: Panasonic KX-NS500, KX-NS520, KX-NS700