Yeastar VoIP PBX Phone System P570
300 Users (upgradeable to 500), 60 (up to 120) Concurrent Calls,1 x Giga LAN, 1 X Giga Wan, Call recording included, 1U Rackmount, (Optional & sold seperately - Upto 6 GSM/16 analog Ports/ 2 x E1 port, 2 x expansion board slot) 3 Year warranty