Technical Details:\n• Model: UCM6304A\n• Users Supported: Up to ~750–1000 users (varies by deployment)\n• Concurrent Calls: Up to ~150–200 calls\n• Analog Interfaces: 4 × FXS and 4 × FXO RJ11 ports for analog phones/PSTN lines\n• Network Ports: 3 × Gigabit RJ45 with PoE+ and NAT/router support\n• VoIP Platform: Asterisk-based communications OS (version 16)\n• Built-In Features:\n– Instant Messaging (IM) and Presence\n– Audio conferencing & web meetings\n– Integrated IVR and auto attendant\n– Zero-configuration provisioning for Grandstream SIP endpoints\n• Codec Support: G.711, G.722, Opus full-band, G.729, T.38 fax, and more\n• Security & Networking: Secure boot, SRTP/TLS, automated NAT/firewall traversal, advanced QoS\n• Expansion & Integration: API support for CRM/PMS and GDMS cloud management\n• Local Interfaces: USB ports and SD card interface (for backup/recording)\n• Display: 320×240 color LCD touchscreen\n• Power: 100–240 VAC input, DC 12 V output\n• Mounting: Desktop or wall mountable