Description Grandstream UCM6304 4 FXO IP PBX The Grandstream UCM6304 4 FXO IP PBX is a powerful VoIP communication system designed for medium to large businesses. It supports up to 2000 users and 300 concurrent calls, ensuring smooth and reliable connectivity. With 4 FXO ports, 150 SIP trunks, HD audio/video conferencing, advanced call features, and strong security protocols, it delivers an all-in-one solution for business communications. Integrated cloud management via GDMS and built-in recording make it a smart choice for scalable and secure enterprise telephony. Grandstream UCM6304 4 FXO IP PBX -Full Specifications Feature Specification Model UCM6304 FXO Ports 4 × RJ11 (PSTN lines) FXS Ports 4 × RJ11 (Analog phones) User / Extension Support Up to 2,000 users Concurrent Calls Up to 300 calls Ethernet / Network Ports 3 × Gigabit RJ45, auto-sensing, PoE support USB Ports 2 × USB 3.0 SD Card Slot 1 × SD card for storage / backup LCD Display 128 × 32 dot-matrix graphic LCD with navigation buttons Power Supply 12V DC, 100–240V AC input Form Factor Desktop / Rack-mountable Telephony Engine Asterisk 16 Codec Support Opus, G.711, G.729, G.722, H.264, H.265, VP8 Conferencing Support Integrated audio/video conferencing Remote Management GDMS (Grandstream Device Management System), UCM RemoteConnect Security TLS, SRTP, Secure Boot, Unique device certificate Backup & Restore Local and cloud backup support Call Features IVR, call routing, queues, ring groups, CDR Additional Features Hot-standby/failover support, WebRTC/Wave app integration, API for CRM/PMS
