Type: : PABX System which can also work as IP-PBXwith Universal Connectivity and Mobile Extensions Max. IP Users: 500 Max. TDM Ports: 60 Built-in Hardware: PSU, CPU, Mother Board Universal Slots: 3 Power Supply: Universal SMPS ( 90-265V AC, 47-63 Hz) Built-in Ports: AIP, AOP, DIP, DOP, RS232C & Ethernet " Salient Features: 15-Party Conference, Universal Gateway, Mobile Trunks & Extensions, Hospitality, PMS and CAS"