Patton SN4741/72JS72VSP/RJ11-21/EUI 72 Fxs Rj11&3xrj21-50pin, K.21 Surge

Brand: Patton Electronics
ADI #:EF-SN474172U Model #: SN4741/72JS72VSP/RJ11-21/EUI  Name: Patton SN4741/72JS72VSP/RJ11-21/EUI 72 Fxs Rj11&3xrj21-50pin, K.21 Surge