The Grandstream UCM6304 is a powerful, Unified Communications IP PBX engineered to serve as the central nervous system for modern business communications. Grandstream UCM6304 designed for scalability and resilience, it supports up to 2000 users and 300 concurrent calls, making it an ideal solution for growing organizations.
This all-in-one platform consolidates voice, video calling, video conferencing, video surveillance, mobility, and data services into a single, manageable appliance. Grandstream UCM6304 has features 4 FXS and 4 FXO analog ports, each with lifeline capability for continued operation during a power outage, and can be expanded further with external gateways. Its three self-adaptive Gigabit ports with integrated PoE+ provide flexible, high-speed connectivity and can operate in switched, routed, or dual mode with a built-in NAT router for network deployment versatility.
Communication quality is ensured with advanced Voice-over-Packet technology, including 128ms echo cancellation, a dynamic jitter buffer, and Forward Error Correction (FEC 2.0). The Grandstream UCM6304 is exceptionally resilient, maintaining clear audio even with up to 50% packet loss. It supports a wide array of modern and legacy codecs, including Full-Band Opus for superior audio and H.265/H.264 for efficient, high-quality video.
Deployment and management are streamlined through Zero-Configuration auto-provisioning for Grandstream endpoints and cloud-based oversight via the Grandstream Device Management System (GDMS). For workforce mobility, the free Wave app delivers full PBX functionality to users on Windows, macOS, iOS, Android, and web browsers.
Security is foundational, with features like secure boot, unique certificates, TLS/SRTP encryption for media, and automated firewall traversal for secure remote connections. Grandstream UCM6304 has full API unlocks deep integration with third-party platforms like CRM and PMS, allowing businesses to create customized, efficient workflows. Grandstream UCM6304 comes with its rack-mountable design, comprehensive call center features (including ACD and call queues), and support for multi-language IVRs, the Grandstream UCM6304 provides a future-proof, enterprise-grade communications foundation.
Short Key Features
- Capacity: Supports 2000 users & 300 concurrent calls.
- Built-in Conferencing: Unlimited rooms, 200 participants, 9 video feeds per room.
- Connectivity: 4 FXS + 4 FXO ports, 3x Gigabit PoE+ ports, Dual-mode NAT Router.
- Mobility: Free Wave app for desktop & mobile.
- Security: Secure Boot, TLS/SRTP, Automated Firewall Traversal.
- Management: Zero-touch provisioning, GDMS cloud, Full API for integration.
- Voice/Video Quality: Supports Opus & H.265, jitter resilience up to 50% packet loss.
| Category | Specification |
|---|---|
| Model | Grandstream UCM6304 IP PBX |
| Analog FXS Ports | 4 RJ11 ports, lifeline capability during power outage; expandable via external FXS gateway |
| PSTN FXO Ports | 4 RJ11 ports, lifeline capability during power outage; expandable via external FXO gateway |
| Network Interfaces | 3 × self-adaptive Gigabit ports (switched, routed or dual mode) with PoE+ |
| NAT Router | Yes (supports router mode and switch mode) |
| Peripheral Ports | 2 × USB 3.0, 1 × SD card slot |
| LED Indicators | Power, FXS, FXO, LAN, WAN, Heartbeat |
| LCD Display | 128 × 32 dot-matrix graphic LCD with DOWN and OK buttons |
| Reset Switch | Yes; long press = factory reset, short press = reboot |
| Voice-over-Packet | LEC with NLP, 128 ms tail-length echo cancellation, dynamic jitter buffer, modem detection & auto-switch to G.711, NetEQ, FEC 2.0, jitter resilience up to 50% audio packet loss |
| Voice & Fax Codecs | Opus, G.711 A-law/U-law, G.722, G.722.1, G.722.1C, G.723.1 5.3K/6.3K, G.726-32, G.729A/B, iLBC, GSM; T.38 |
| Video Codecs | H.265, H.264, H.263, H.263+, VP8 |
| QoS | Layer 2 QoS (802.1Q, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS) |
| API | Full API for third-party platform and application integration |
| Telephony OS | Based on Asterisk version 16 |
| DTMF Methods | In-band audio, RFC2833, SIP INFO |
| Provisioning & PnP | Mass provisioning via AES-encrypted XML, ZeroConfig auto-discovery & auto-provisioning, DHCP Option 66, multicast SIP SUBSCRIBE, mDNS, eventlist between local and remote trunk |
| Network Protocols | SIP, TCP/UDP/IP, RTP/RTCP, IAX, ICMP, ARP, DNS, DDNS, DHCP, NTP, TFTP, SSH, HTTP/HTTPS, PPPoE, STUN, SRTP, TLS, LDAP, HDLC, HDLC-ETH, PPP, Frame Relay (pending), IPv6, OpenVPN |
| Disconnect Methods | Busy/Congestion/Howl tone, polarity reversal, hook flash timing, loop current disconnect |
| Media Encryption | SRTP, TLS, HTTPS, SSH, 802.1X, ZRTP |
| Power | External supply: 100–240 VAC, 50/60 Hz; Output: DC 12 V, 2 A via 2 × DC 12 V jacks |
| Dimensions | 485 mm (L) × 187.2 mm (W) × 46.2 mm (H) |
| Weight | Unit: 2490 g; Package: 3260 g |
| Operating Conditions | 0–45 ºC, 10–90% RH (non-condensing) |
| Storage Conditions | -10–60 ºC, 10–90% RH (non-condensing) |
| Mounting | Rack mount & desktop |
| Web UI Languages | English, Simplified Chinese, Traditional Chinese, Spanish, French, Portuguese, German, Russian, Italian, Polish, Czech, Turkish (plus custom language pack) |
| IVR/Prompt Languages | English, Chinese, British English, German, Spanish, Greek, French, Italian, Dutch, Polish, Portuguese, Russian, Swedish, Turkish, Hebrew, Arabic, Nederlands; customizable |
| Caller ID | Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227 – BT, NTT |
| Polarity Reversal/Wink | Supported, with enable/disable on call setup/termination |
| Call Center Features | Multiple call queues, ACD based on skills/availability/workload, in-queue announcements |
| Auto Attendant | Up to 5 IVR layers, multi-language |
| Max Users | 2000 users |
| Max Concurrent Calls | 300 concurrent G.711 calls |
| Max SRTP Calls | 200 concurrent G.711 SRTP calls |
| Conference Capacity | Unlimited rooms; up to 200 participants in all rooms combined; up to 9 video feeds per room (series spec) |
| Wave App | Free; Windows, macOS, Web (Firefox/Chrome), Android & iOS; supports UCM-hosted meetings and SIP calling |
| Call Features | Call park/forward/transfer/waiting, caller ID, call recording, history, IVR, music on hold, routes, DID/DOD, DND, DISA, ring groups, simultaneous ring, time schedules, PIN groups, queues, pickup groups, paging/intercom, voicemail, wakeup, SCA, BLF, voicemail-to-email, fax-to-email, speed dial, callback, dial-by-name, emergency call, follow-me, blacklist/whitelist, voice/video conference, eventlist, feature codes, busy camp-on/call completion, voice control, post-meeting reports, virtual fax, email-to-fax |
| Firmware Upgrade | Supported via Grandstream Device Management System (GDMS) cloud platform |
| IP/SIP Standards | SIP and related RFCs (3261, 3262, 3263, 3264, 3515, 3311, 4028, 2976, 3842, 3892, 3428, 4733, 4566, 2617, 3856, 3711, 4582, 4583, 5245, 5389, 5766, 6347, 6455, 8860, 4734, 3665, 3323, 3550, 6189) |
| Compliance | FCC Part 15 Class B & Part 68; CE (EN 55032, EN 55035, EN 61000-3-2, EN 61000-3-3, EN 62368-1, ETSI ES 203 021, ITU-T K.21); IC (ICES-003, CS-03); RCM (AS/NZS CISPR 32, AS/NZS 62368.1, AS/CA S002, AS/CA S003.1/.2); power adapter UL/EN 62368-1 |
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