รายละเอียด Yeastar P570 VoIP IPPBX Features Users: 300 (up to 500) Max Concurrent Calls: 30 (up to 120) Max Analog Ports: 16 Max BRI Ports: 16 Max Cellular Ports: 6 Max E1/T1/J1 Ports: 2 Expansion Boards: 2*EX30/EX08 1*D30 External Storage: USB, HDD Yeastar_P-Series_PBX_System_Datasheet_en
