The Grandstream UCM6304A is a high-performance IP PBX appliance that delivers a full suite of unified communication features for growing small to medium-sized businesses (SMBs) and enterprise branch offices. Designed to support up to 2000 users and 300 concurrent calls, the UCM6304A enables seamless voice, video, messaging, mobility, and collaboration — all with zero licensing fees or per-feature costs.
This powerful solution provides a centralized communication platform, replacing traditional phone systems with an IP-based solution that integrates easily into existing network infrastructures. With support for analog and SIP trunks, video conferencing, advanced call routing, and remote connectivity, the UCM6304A is ideal for businesses looking for a secure, scalable, and easy-to-manage communications system.
Key Features:
High Capacity for Growing Businesses
- Supports up to 2000 users
- Handles up to 300 concurrent calls
- Ideal for large offices, call centers, and multi-site deployments
Analog and IP Trunk Integration
- 4 FXO ports for PSTN lines
- 4 FXS ports for analog phones or fax machines
- Full SIP trunk support for VoIP calling
Complete Unified Communications Platform
- Voice, video, chat, presence, voicemail, and conferencing in one device
- Built-in video conferencing and collaboration tools
- Includes voicemail-to-email, auto-attendant (IVR), ring groups, and more
Advanced Security and Privacy
- Built-in firewall with TLS, SRTP, HTTPS, SSH, and secure boot
- Intrusion detection and prevention, blacklists, Fail2Ban, and more
- Secure remote access via UCM RemoteConnect (cloud NAT traversal)
Remote and Mobile Workforce Support
- Fully compatible with Grandstream Wave softphone app (Android, iOS, Windows, macOS)
- Supports desktop and mobile access for remote teams
- WebRTC support for browser-based calling and conferencing
Scalable and Easy to Manage
- Web-based configuration and system monitoring
- Centralized cloud management with Grandstream Device Management System (GDMS)
- Zero-config provisioning for Grandstream IP phones and devices
Technical Specifications:
| Feature | Specification |
|---|---|
| Users Supported | Up to 2000 |
| Concurrent Calls | Up to 300 |
| FXO Ports | 4 (PSTN line integration) |
| FXS Ports | 4 (analog phone/fax support) |
| Network Interfaces | 2 × Gigabit RJ45 (PoE & NAT support) |
| USB Ports | 2 × USB 3.0 |
| SD Card Slot | 1 × SD slot for storage and call recordings |
| Voice Codecs | G.711, G.722, G.729A/B, iLBC, OPUS, etc. |
| Video Codecs | H.264, H.263, H.263+ |
| Power Supply | 12V DC or PoE (802.3af) |
| Dimensions | Approx. 180 mm × 120 mm × 30 mm |
| Operating Temperature | 0°C ~ 40°C |
| Mounting | Desktop or rack-mountable with kit |
Ideal Use Cases:
- Medium to large offices with high call volumes
- Multi-site businesses needing centralized telephony
- Call centers and customer support hubs
- Educational institutions, healthcare, government offices
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