Yeastar MyPBX U520

2 E1/T1/J1 port, 500 Extensions (SIP\IAX), 80 Concurrent calls (max), 16 Analog ports (FXO\FXS), 8 GSM ports, 8 UMTS ports, 8 BRI ports, 1 10/100Base-T Ethernet LAN port, 1 10/100Base-T Ethernet WAN port, 128 VoIP Trunks, 3000 min Voicemail, 64 IVR, 1 USB port, T.38 FAX support, 2.5 inch SATA2 Hard Disk support