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Grandstream UCM6304
| Type | IP PBX / Unified Communications Server |
| Users Capacity | up to 2000 SIP users |
| Concurrent Calls | up to 300 simultaneous calls |
| FXS Ports | 4 × RJ11 (analog phones / fallback lines) |
| FXO Ports | 4 × RJ11 (PSTN / analog trunk lines) |
| Network Ports | 3 × Gigabit Ethernet (LAN/WAN + routing/switching modes) |
| USB Ports | 2 × USB 3.0 |
| Storage | SD card slot |
| Display | 128 × 32 LCD status screen |
| Power | 12V DC (dual power support on some setups) |