Grandstream UCM6304 IP PBX, 2000 Users, 300 Calls, 4 FXS + 4 FXO, Video Meetings

Part number UCM6304

Supports up to 2000 users and up to 300 concurrent calls (G.711)
4 FXS and 4 FXO RJ11 ports; all ports have lifeline capability in case of power outage
Zero configuration provisioning of Grandstream SIP endpoints
Built-in conferencing & meetings platform with video (H.265/H.264/H.263/H.263+/VP8); supports desktop, Wave app and SIP endpoints
Wave for Android, iOS, Chrome and Firefox browsers allows communication with all UCM6300 users & solutions
API available for third-party integrations, including CRM and PMS platforms
Three Gigabit auto-sensing RJ45 ports with integrated PoE+ and NAT router; automated NAT firewall traversal (UCM RemoteConnect) for secure remote connections
Secure boot, unique certificate and random default password; Hot Standby High-Availability support

SIP PoE Gigabit Video Conference FXO FXS Grandstream IP PBX Rack Mount

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Delivery within 4–10 business days across Saudi Arabia
Warranty according to the manufacturer
Tax invoice with every order
Technical support before and after purchase

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Official datasheetGrandstream_UCM6304_Datasheet.pdf Download

Overview of Grandstream UCM6304

The Grandstream UCM6304 is part of the UCM6300 series of IP PBXs, a unified communication and collaboration platform that brings voice, video calling, video conferencing, video surveillance, web meetings, mobility, facility access and intercoms onto one centralized network. It supports up to 2000 users and 300 concurrent calls, with 4 FXS and 4 FXO ports for analog phones and PSTN lines. A built-in web meetings and video conferencing solution, the Wave app for desktop, web and mobile, UCM RemoteConnect for secure remote access, GDMS cloud management and an API for CRM and PMS integration make it a strong fit for offices, hotels, clinics, schools and multi-branch businesses.

Technical Specifications – Grandstream UCM6304

Hardware

Analog Telephone FXS Ports	4 RJ11 Ports; all ports have lifeline capability in case of power outage; number of ports can be expanded by peering with an FXS gateway
PSTN Line FXO Ports	4 RJ11 Ports; all ports have lifeline capability in case of power outage; number of ports can be expanded by peering with an FXO gateway
Network Interfaces	Three self-adaptive Gigabit ports (switched, routed or dual mode) with PoE+
NAT Router	Yes (supports router mode and switch mode)
LED Indicators	Power 1/2, FXS, FXO, LAN, WAN, Heartbeat
LCD Display	128x32 dot matrix graphic LCD with DOWN and OK buttons
Reset Switch	Yes, long press for factory reset and short press for reboot

Voice & Telephony

Voice-over-Packet Capabilities	LEC with NLP Packetized Voice Protocol Unit, 128ms-tail-length carrier grade Line 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 and 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
Telephony Operating System	Based on Asterisk version 16
DTMF Methods	In-band audio, RFC2833, and SIP INFO
Disconnect Methods	Busy/Congestion/Howl Tone, Polarity Reversal, Hook Flash Timing, Loop Current Disconnect
Caller ID	Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227 – BT, NTT
Polarity Reversal/Wink	Yes, with enable/disable option upon call establishment and termination

Network & Security

QoS	Layer 2 QoS (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS) QoS
API	Full API available for third-party platform and application integration
Provisioning Protocol & Plug-and-Play	Mass provisioning using AES encrypted XML configuration file, auto-discovery & auto-provisioning of Grandstream IP endpoints via ZeroConfig (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, IPv6, OpenVPN
Media Encryption	SRTP, TLS, HTTPS, SSH, 802.1X, ZRTP
Internet Protocol Standards	RFC 3261, RFC 3262, RFC 3263, RFC 3264, RFC 3515, RFC 3311, RFC 4028, RFC 2976, RFC 3842, RFC 3892, RFC 3428, RFC 4733, RFC 4566, RFC 2617, RFC 3856, RFC 3711, RFC 4582, RFC 4583, RFC 5245, RFC 5389, RFC 5766, RFC 6347, RFC 6455, RFC 8860, RFC 4734, RFC 3665, RFC 3323, RFC 3550, RFC 6189
Firmware Upgrade	Supported by Grandstream Device Management System (GDMS), a zero-touch cloud provisioning and management system that provides a centralized interface to provision, manage, monitor and troubleshoot Grandstream products

Capacity & Features

Maximum Call Capacity	Users: 2000; Concurrent calls (G.711): 300; Max concurrent SRTP calls (G.711): 200
Maximum Meeting Capacity	Unlimited meeting rooms (up to 15 simultaneous public rooms); maximum of 200 simultaneous participants across all rooms combined; up to 9 video feeds per room
Call Center	Multiple configurable call queues, automatic call distribution (ACD) based on agent skills/availability/workload, in-queue announcement
Customizable Auto Attendant	Up to 64 layers of IVR (Interactive Voice Response) in multiple languages
Wave App	Free; available for desktop (Windows 10+, Mac OS 10+), web (Firefox and Chrome browsers) and mobile (Android & iOS), allows users to join UCM-hosted meetings/conferences, communicate with other users/solutions and make/receive calls using SIP accounts registered to a UCM6300 series IP PBX
Call Features	Call park, call forward, call transfer, call waiting, caller ID, call record, call history, ringtone, IVR, music on hold, call routes, DID, DOD, DND, DISA, ring group, ring simultaneously, time schedule, PIN groups, call queue, pickup group, paging/intercom, voicemail, call wakeup, SCA, BLF, voicemail to email, fax to email, speed dial, call back, dial by name, emergency call, call follow me, blacklist/whitelist, voice conference, video conference, eventlist, feature codes, busy camp-on/call completion, voice control, post-meeting reports, virtual fax sending/receiving, email to fax
Multi-Language Support	Web UI: English, Simplified Chinese, Traditional Chinese, Spanish, French, Portuguese, German, Russian, Italian, Polish, Czech, Turkish; Customizable IVR/voice prompts: English, Chinese, British English, German, Spanish, Greek, French, Italian, Dutch, Polish, Portuguese, Russian, Swedish, Turkish, Hebrew, Arabic, Nederlands; Customizable language pack to support any other languages

Physical

Universal Power Supply	2x DC 12V Power Jack; Input: 100~240VAC, 50/60Hz; Output: DC 12V, 2A
Dimensions	485mm(L) x 187.2mm(W) x 46.2mm(H)
Weight	Unit Weight: 2490g; Package Weight: 3260g
Temperature & Humidity	Operating: 32 - 113ºF / 0 ~ 45ºC, Humidity 10 - 90% (non-condensing); Storage: 14 - 140ºF / -10 ~ 60ºC, Humidity 10 - 90% (non-condensing)
Mounting	Rack mount & Desktop
Compliance	FCC: Part 15 (CFR 47) 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 Part I Issue 9; RCM: AS/NZS CISPR 32, AS/NZS 62368.1, AS/CA S002, AS/CA S003.1/.2; Power adapter: UL 60950-1 or UL 62368-1

Source: Grandstream official website and datasheet. Specifications are subject to change by the manufacturer.

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PRACTICAL ANSWERS

Business PBX questions

How do I estimate the size of a business phone system?

Separate the number of extensions from the number of simultaneous external calls. Also list sites, users, call routing and growth needs so the proposed system and licenses can be checked against the actual workload.

Should the PBX be on-site or hosted?

Compare administration responsibilities, connectivity, continuity needs and the available support arrangement. Ask for a clear description of what is hosted, what remains at your site, and any recurring licenses or service charges.

Can existing business phones be reused?

Provide the exact phone models and firmware details where available. Check the proposed PBX’s supported device list and required features, then test a representative device before assuming every existing phone can be retained.

Are telephone numbers and call service included with the PBX?

Treat the PBX equipment or software and the telephone service as separate scope items unless the quotation explicitly combines them. Confirm responsibility for numbers, external calling capacity, provider coordination and ongoing charges.

How should business-hours and after-hours calls be handled?

Write the intended call flow before configuration: greetings, departments, fallback destinations and closing-time behavior. Review the wording in the required languages and test each route with a real representative call.

What should be included in a PBX handover?

Agree on the extension list, call-flow diagram, authorized administrator access and configuration backup process. Test the required incoming and outgoing calls, transfers and fallback paths, and document any functions excluded from the scope.

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