● 500 SIP users ● 60 concurrent calls ● 4 interface board slots ● Analog FXS/FXO ports: max. 32 ● E1 ports: max. 2 ● 800 SIP users  ● 100 concurrent calls ● 4 interface board slots ● Analog FXS/FXO ports: max. 32 E1 ports: max. 4 ● 1000 SIP users, 200 concurrent calls  ●  4 interface board slots ● Analog FXS/FXO ports: max. 32 E1 ports: max. 4 ●