Grandstream UCM6304 (4x FXS, 4x FXO) VoIP PBX

Description

Unified Communications for Mid-Sized Business — No Licensing Fees

The Grandstream UCM6304 is an easy-to-manage device that does not require licensing fees and supports up to 2,000 users and up to 300 concurrent calls. It centralises voice calls, video conferencing, web meetings, video surveillance, facility access, and cloud application integration into a single network — providing the feature depth of an enterprise communications platform at a fraction of the typical cost.

Key Highlights

• 4× FXO RJ11 ports (PSTN trunks) and 4× FXS RJ11 ports (analogue telephone lines)
• Up to 2,000 users and 300 concurrent calls (200 with SRTP encryption)
• 3× self-adaptive Gigabit PoE+ network ports (switched, routed, or dual card mode)
• Dual ARM Cortex-A53 Quad-Core processor with 4GB memory
• No per-user, per-feature, or ongoing licensing fees

 

Rich Telephony Features

The UCM6304 is built on Asterisk 16 and delivers a comprehensive telephony feature set out of the box. Auto-attendant, call queues, ring groups, call recording, and customisable call distribution are all included, with zero-configuration provisioning making it straightforward to deploy Grandstream SIP endpoints at scale.

• Auto attendant with multi-level IVR
• Call queues, ring groups, call forwarding, and call recording
• Integrated conference bridge for up to 200 participants in an audio conference
• Zero-configuration provisioning of Grandstream SIP endpoints
• Support for SIP trunks and analogue PSTN lines simultaneously
• 320×240 colour LCD with touchscreen for shortcut keys and scroll bar

 

Built-In Video Conferencing & Collaboration

The UCM6304 supports up to 4 video conference rooms with up to 40 participants at 1080p Full HD resolution, with screen sharing and whiteboarding. The Wave app for Android, iOS, Chrome, and Firefox allows communication with all UCM6300 users and solutions, keeping remote and hybrid teams connected through a single, cohesive platform.

• Built-in HD video conferencing — up to 4 rooms, 40 participants at 1080p
• Screen sharing and whiteboarding
• Wave app for Android, iOS, Chrome, and Firefox
• UCM RemoteConnect cloud NAT traversal for secure remote access without complex VPN setup
• Full-Band Opus voice codec and H.264/H.263/H.265/VP8 video codec with jitter resilience up to 50% packet loss

 

Enterprise-Grade Security

Security features include secure boot, unique device certificates, randomised default passwords, and TLS and SRTP encryption for secure communications. The integrated NAT router and firewall provide network-level protection, while automated NAT traversal facilitates secure remote worker connections without exposing the PBX directly to the internet.

• Secure boot with unique per-device certificates and randomised default passwords
• SRTP, TLS, and HTTPS with hardware encryption acceleration
• Fail2ban, whitelist/blacklist, and intrusion alerts
• Automated NAT firewall traversal for secure remote connections
• Integrated NAT router with router and switch mode support

 

Third-Party Integration & Cloud Management

An API is available for third-party integrations including CRM and PMS platforms, enabling the UCM6304 to slot into existing business workflows. GDMS provides a free centralised interface to provision, manage, monitor, and troubleshoot devices — individually or in batches by site, group, and model — with bank-grade TLS encryption and two-factor authentication.

• CRM and PMS integration with open API for custom workflows
• GDMS cloud management — free, no subscription required
• Zero-config provisioning via ZeroConfig, DHCP Option 66, multicast SIP, and mDNS
• On-premise control with optional remote access via UCM RemoteConnect
• 1× USB 2.0, 1× USB 3.0, and 1× SD card interface for storage and backup
• Rack-mountable 1U form factor

 

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