Users: 20 Max SIP Extensions: 8 VoIP Trunk: 4 Analog Ports: 8 by default+4 by modules Max BRI Ports: 2 Max Cellular Ports: 2 Max E1/T1/J1 Ports: N/A Expansion Board: N/A External Storage: TF Card

Users: 20 Max Concurrent Calls: 10 Max Analog Ports: 4 Max BRI Ports: 4 Max Cellular Ports: 1 Max E1/T1/J1 Ports: N/A Expansion Boards: N/A External Storage: TF Card

Users: 50 Max Concurrent Calls: 25 Max Analog Ports: 8 Max BRI Ports: 8 Max Cellular Ports: 4 Max E1/T1/J1 Ports: N/A Expansion Board: N/A External Storage: SD Card

Users: 100 (up to 200) Max Concurrent Calls: 30 (up to 60) Max Analog Ports: 16 Max BRI Ports: 16 Max Cellular Ports: 6 Max E1/T1/J1 Ports: 2 Expand Boards: 2*EX30/EX08+1*D30 External Storage: SD Card