Grandstream UCM6304 IP PBX

The Grandstream UCM6304 IP PBX is a high-performance unified communications system designed for growing businesses that need advanced voice, video, messaging, and collaboration solutions. Built to support up to 2000 users and 300 concurrent calls, this hybrid PBX combines powerful on-premise control with cloud-enabled remote access through UCM RemoteConnect and GDMS. With 4 FXO and 4 FXS ports, the UCM6304 supports analog telephony, SIP trunking, and VoIP while offering video conferencing, secure mobile integration, and intuitive provisioning tools.

Product Features

High performance & scalability
Handles up to 2000 users and 300 concurrent calls, including up to 200 concurrent encrypted (SRTP) calls. Ideal for mid-sized enterprises and busy call environments.

Integrated video and voice collaboration
Includes built-in web and video conferencing (up to 4 rooms, 40 participants) and supports the Wave app for Android, iOS, Chrome, and Firefox—ensuring seamless communication across all devices.

PoE-enabled gigabit connectivity
Equipped with 3 auto-sensing Gigabit RJ45 ports with PoE+ support and NAT routing capabilities, simplifying setup and enhancing performance.

Robust cloud management
Compatible with GDMS and UCM RemoteConnect, allowing remote monitoring, provisioning, backup, firmware updates, and full control over multi-site networks.

FXO/FXS analog support
Includes 4 FXO and 4 FXS ports for PSTN/analog phone connectivity, all with lifeline capabilities during power outages.

Superior audio & video quality
Supports full-band Opus audio codec, H.264/H.265/VP8 video codecs, and 50% jitter resilience. Advanced audio processing features include echo cancellation, dynamic jitter buffer, and comfort noise generation.

Flexible deployment & easy maintenance
Supports centralized and multi-site distributed deployments. The intuitive web interface simplifies setup and management even for non-technical users.

Secure & enterprise-ready
Features strong security including secure boot, unique certificates, TLS/SRTP encryption, and role-based system access.

Product Specifications

• Maximum users: 2000
• Concurrent calls: 300 (200 max SRTP calls)
• FXO ports: 4 RJ11 ports with lifeline support
• FXS ports: 4 RJ11 ports with lifeline support
• Network interfaces: 3 x Gigabit RJ45 (switched/routed/dual) with PoE+
• Peripheral ports: 2 x USB 3.0, 1 x SD card slot
• Video conferencing: 4 rooms, up to 40 participants at 1080p
• Voice conferencing: Up to 200 participants
• Display: 128×32 dot matrix LCD, navigation buttons
• Security: SRTP, TLS, HTTPS, SSH, 802.1X, secure boot
• APIs: Full API support for CRM/PMS integration
• Telephony OS: Based on Asterisk version 16
• Audio codecs: Opus, G.711, G.722, G.726, G.729A/B, iLBC, GSM
• Video codecs: H.264, H.265, VP8, H.263+
• QoS support: 802.1Q/p, ToS, DiffServ, MPLS
• Provisioning: ZeroConfig, AES-encrypted XML, HTTP/HTTPS/TFTP
• Power: 2x DC 12V inputs, universal 100–240VAC supply
• Dimensions: 485mm x 187.2mm x 46.2mm
• Weight: 2490g (unit), 3260g (packaged)
• Mounting: Desktop or rack mount
• Temperature: 0–45°C operating, -10–60°C storage
• Humidity: 10–90% non-condensing
• Web UI languages: English, French, Spanish, German, Arabic, Turkish, Chinese & more
• Custom IVR prompts: Available in multiple languages
• Call features: Call park, forward, transfer, waiting, voicemail, paging, IVR, queues, ring groups, blacklist/whitelist, DND, auto-attendant (5 layers), BLF, fax to email, call recording, and more

Ideal for businesses needing:

• Advanced on-premise PBX control with cloud flexibility
• Analog and VoIP line integration
• Secure remote collaboration via Wave app
• Scalable multi-site deployment