Type: : PABX System which can also work as IP-PBX with Universal Connectivity and Mobile Extensions Max. IP Users: 50 Max. TDM Ports: 48 Universal Slots: 6 Power Supply: Universal SMPS ( 90-265V AC, 47-63 Hz) Built-in Ports: AIP, AOP, USB, RS232C & Ethernet " Salient Features: 15-Party Conference, Universal Gateway, Mobile Trunks & Extensions, Hospitality, PMS and CAS"