- Enterprise-Grade Unified Communication Solution - IP PBXs allows businesses of all sizes to build powerful and scalable unified communication solutions in an easy-to-manage fashion with no licensing fees - Analog Telephone FXS Ports: 4 RJ11 Port - PSTN Line FXO Ports: 4 RJ11 Port - Users: 2000 - Concurrent calls: 300 - Max concurrent SRTP calls: 200 - Video Conference: Up to 30 - Voice Conference: Up to 120 - Three self-adaptive Gigabit ports (switched, routed or dual card mode) with PoE+ - 1USB 2.0, 1USB 3.0, 1SD card interface - 320x240 color LCD with touch screen for Shortcut Keys and Scroll Bar Maximum Concurrent Calls: 300 Number FXO Ports: 4 Number FXS Ports: 4 Wall or Rack Mountable: Wall Color: Black