YEASTAR S300 VoIP PBX

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SIP Ext: 300 SIP Extensions (upgradeable to 500 with Card D30) | Analog Ports: up to 24 FXO/FXS Ports (w/o EX and Module) | Storage: SD Card/USB/HDD | Expansion Port: 3 | Expand Slots (3 Card EX08/EX30 & 2 Card D30)