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Key Features of the Grandstream UCM6304 IP PBX Grandstream UCM6304 IP PBX-Supports Upto 2000 users,Up to 300 concurrent calls,PORTS:4*RJ11,3Gigabit Ethernet ports,2 USB 3.0,1*SDCard Slot. Supports up to 2,000 users Supports up to 300 concurrent G.711 calls 4 FXO ports for connecting analog/PSTN telephone lines 4 FXS ports for analog phones,...