Digital EPABX Systems IP ENABLE Redundant / HSB : CPU & Power Supply PRI / IP / Magneto / TWT / GSM Card Real Time Instant Fault Detection (System Health Monitoring) with SMS alert Field Programmable Universal Ports Card : FXS | FXO | Magneto | TWT Radios Interoperability (CNR) Optional Upto 12 Km. Long Distant Extensions Analog Phones Compact Size : 3U, 19 inch Rack Mountable, Light Weight : 25 Kg appx.