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Grandstream UCM6304 IP PBX | 4 FXS + 4 FXO Ports, 2000 Users, 300 Concurrent Calls
Rack-mounted telephony hardware that ties analogue handsets, PSTN lines, and internet extensions into one managed platform for Kenyan offices.
Condition: New
Note: price and availability are subject to change without prior notice
The Grandstream UCM6304 IP PBX is now in stock at Mascom International for KSh 93,000, arriving brand new and sealed at Old Mutual Building, First Floor Room 4, Kimathi Street, Nairobi CBD. This unit carries 4 analogue telephone FXS ports, 4 PSTN line FXO ports, and licence-free capacity for 2,000 extensions with 300 simultaneous G.711 calls. The Grandstream UCM6304 runs the Asterisk 16 telephony operating system on three self-adaptive Gigabit network ports with PoE+ input. Two USB 3.0 sockets and one SD card slot store call recordings locally. At KSh 93,000, the UCM6304 works out to roughly KSh 310 per simultaneous call channel.
Hotels along Diani and around Naivasha, SACCOs, private hospitals, insurance call centres in Westlands and Upper Hill, county government offices, logistics firms in Industrial Area, and schools with multiple blocks all face the same problem: staff burn through airtime calling colleagues who sit two floors away, and customers reach voicemail because nobody routes the main line properly. The Grandstream UCM6304 collapses that spend into internal extension dialling that costs nothing per call. Reception rings a queue instead of one desk, and every missed call lands in a report you can actually read.
Unlike other electronics retailers in Kenya who stock consumer routers and call it business networking, Mascom International supplies the Grandstream UCM6304 with GRP series desk phones, PoE switches, and cabling from one counter. At Mascom International, we're seeing Kenyan businesses replace ageing Panasonic analogue PABX cabinets with the Grandstream UCM6304 specifically because it keeps existing handsets alive during the switch. Users consistently report that the hardest part of the migration is agreeing on the extension numbering plan, not the wiring. Visit our Kimathi Street store to see a live unit running, or order for countrywide delivery.
Common Questions About the Grandstream UCM6304 IP PBX
How many staff and simultaneous calls can the Grandstream UCM6304 really support?
The Grandstream UCM6304 supports up to 2,000 registered users and 300 concurrent G.711 calls, dropping to 200 concurrent calls when every leg is encrypted with SRTP. In practice a 120-staff insurance office rarely exceeds 30 calls at once, so the headroom covers years of hiring. Meeting capacity runs separately: unlimited meeting rooms with up to 15 running as public rooms simultaneously, 200 total participants across all of them, and up to 9 video feeds shown per room.
Can I keep my existing analogue phones and Telkom Kenya landlines?
Yes. The 4 FXS ports accept ordinary analogue handsets and fax machines over RJ11 cabling, while the 4 FXO ports take incoming Telkom Kenya PSTN lines. That means your reception desk keeps its familiar phone, your fax machine still receives KRA and tender documents, and your published landline number stays unchanged. Offices needing more analogue sockets can peer the UCM6304 with a Grandstream FXS or FXO gateway rather than replacing the appliance. Most Kenyan sites run a mix of PSTN lines and SIP trunks together.
What happens to phone calls when Kenya Power goes off?
Every FXS and FXO port on the UCM6304 carries lifeline capability, meaning selected analogue phones connect straight through to the PSTN line during a power cut so emergency calls still go out. IP extensions and meetings stop until power returns, since desk phones and switches need electricity. Mascom International recommends pairing the unit with an APC or Mecer UPS in the 1000VA to 1500VA range, which typically holds the PBX and a PoE switch for 20 to 40 minutes.
Does the Grandstream UCM6304 charge monthly fees per extension?
No. On-premise features including extensions, call queues, IVR menus, voicemail, call recording, and built-in meetings carry no per-user licence fee, so the KSh 93,000 purchase price is the software cost. That works out to about KSh 47 per supported user across the full 2,000-user ceiling. UCM RemoteConnect, the hosted service that handles firewall traversal for staff outside the office, is a separate optional subscription with a free entry tier. Cloud-hosted rivals typically bill every extension monthly, forever.
How do branch and work-from-home staff connect to the office lines?
Grandstream's free Wave app carries your office extension onto Android phones, iPhones, Windows and Mac desktops, and Chrome or Firefox browsers. A branch manager in Kisumu dials colleagues by extension over Safaricom or Airtel data, joins meetings, sends chat messages, and shares files without a desk phone. Calls placed through Wave still exit via the head-office trunk, so customers see your main number. Adding UCM RemoteConnect handles the firewall traversal automatically instead of asking your IT team to open router ports.
Is the UCM6304 difficult to set up for a small IT team?
Setup runs through a browser interface with a guided wizard covering trunks, extensions, and call routes. Grandstream GRP and GXP desk phones on the same network are discovered and provisioned automatically through ZeroConfig, so 40 handsets configure themselves rather than one by one. The front LCD shows the assigned IP address at boot, which removes the usual network scanning step. Mascom International handles installation and dial-plan configuration for Nairobi customers, and supports upcountry sites remotely once the appliance is online.
How does the Grandstream UCM6304 compare to Yeastar, 3CX, or a cloud PBX?
The UCM6304 bundles 4 FXS and 4 FXO ports into the same chassis, whereas comparable Yeastar S-series units often need paid expansion modules to reach eight analogue ports. Against 3CX software you avoid annual per-channel subscriptions and the cost of a server to host it. Cloud PBX services suit sites with reliable fibre, but Kenyan offices with fibre outages keep dialling internally on a local appliance. Recordings and call records also stay on your own SD card rather than a foreign data centre.
Will call quality hold up on typical Kenyan internet connections?
The UCM6304 maintains intelligible audio with jitter resilience rated up to 50% audio packet loss, using FEC 2.0 error correction and a dynamic jitter buffer. Full-band Opus adapts bitrate to available bandwidth, and G.729 compresses each call to roughly 8kbps for constrained branch links. Layer 2 and Layer 3 QoS tagging lets your switch prioritise voice over file downloads. On JTL Faiba, Safaricom Business, or Zuku fibre, 300 concurrent calls need roughly 30Mbps using G.729 compression.
Does it fit a server rack, and what power supply does it use?
The UCM6304 measures 485mm long, 187.2mm wide, and 46.2mm high, sitting as a 1U appliance in a standard 19-inch rack or flat on a shelf. Rack ears are sold separately. The unit weighs 2,490g on its own and 3,260g boxed. Power comes from a 12V DC adapter accepting 100 to 240VAC at 50/60Hz and drawing 2A output, which matches Kenya's 240V mains directly. Two DC 12V jacks allow a redundant second adapter for critical sites.
Technical Specifications
Call Capacity and User Scale
- Supports up to 2,000 registered SIP users, covering head office plus branches on a single appliance
- Handles 300 concurrent G.711 calls, or 200 concurrent calls when SRTP encryption protects every leg
- Unlimited meeting rooms configurable, with up to 15 public rooms running at the same moment
- Up to 200 simultaneous meeting participants across all rooms combined, enough for full-company briefings
- Up to 9 video feeds display per meeting room, suiting departmental stand-ups and board sessions
- Automatic call distribution assigns queued callers by agent skill, availability, or current workload
Analogue Telephone and PSTN Port Configuration
- 4 FXS RJ11 ports connect existing analogue handsets, cordless bases, and fax machines without adapters
- 4 FXO RJ11 ports terminate incoming Telkom Kenya PSTN lines so your published number stays live
- Lifeline capability on every port passes calls through to PSTN during mains power failure
- T.38 fax relay carries fax traffic reliably over IP, plus fax-to-email and email-to-fax routing
- Port count expands by peering the appliance with Grandstream FXS or FXO gateways over the network
- Caller ID standards include Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227, and NTT formats
Network Interfaces and Router Modes
- Three self-adaptive Gigabit RJ45 ports operate in switched mode, routed mode, or dual mode
- Integrated PoE+ input powers the appliance from a compatible switch, removing one mains adapter
- Built-in NAT router function lets the unit serve as gateway for a small voice network
- Two USB 3.0 ports and one SD card slot store call recordings and voicemail locally
- Layer 2 QoS (802.1Q, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS) prioritise voice traffic
- OpenVPN and IPv6 support connect branch sites securely across Safaricom, Zuku, or JTL Faiba links
Meetings, Wave App, and Collaboration
- Free Wave app runs on Android, iOS, Windows 10 or newer, macOS 10 or newer, Chrome, and Firefox
- Staff dial extensions, join meetings, and receive office calls from home over mobile data
- Chat features cover private messages, group chats, file sharing, and starting a meeting from chat
- Post-meeting reports log attendance and duration, useful for billing clients or tracking training sessions
- UCM RemoteConnect handles NAT firewall traversal automatically for remote handsets and Wave users
- Virtual fax sending and receiving works from the browser without keeping a physical fax machine
Voice Quality, Codecs, and Fax Handling
- Jitter resilience rated up to 50% audio packet loss keeps speech intelligible on unstable links
- Full-band Opus codec adapts bitrate dynamically, while G.729A/B compresses calls to roughly 8kbps
- Additional codecs include G.711 A-law/U-law, G.722, G.722.1, G.722.1C, G.723.1, G.726-32, iLBC, and GSM
- Video codecs H.265, H.264, H.263, H.263+, and VP8 support video calls and surveillance streams
- 128ms tail-length line echo cancellation removes the hollow echo common on analogue trunk calls
- Modem detection auto-switches to G.711 so POS terminals and alarm diallers stay functional
Security, Management, and Physical Build
- Secure boot, a unique device certificate, and a random factory password protect the unit from tampering
- SRTP, TLS, HTTPS, SSH, 802.1X, and ZRTP encryption cover call media and administrative access
- GDMS cloud platform provisions, monitors, and upgrades firmware remotely across multiple branch sites
- Full API allows integration with CRM and property management platforms used by hotels and clinics
- Chassis measures 485 x 187.2 x 46.2mm at 2,490g, rack mountable at 1U or desktop placed
- Operating range of 0 to 45°C and 10 to 90% humidity suits Mombasa, Kisumu, and Nairobi server rooms
Package Contents
The Grandstream UCM6304 retail box from Mascom International contains the UCM6304 IP PBX appliance, one 12V DC power adapter rated for 100 to 240VAC input, one RJ45 Ethernet cable, and the Quick Installation Guide with regulatory documentation. Grandstream sells the 19-inch rack mounting kit separately, and Mascom International stocks it alongside patch cables, RJ11 leads, and PoE switches. No desk phones or analogue handsets are included in the box.
Warranty
The Grandstream UCM6304 carries a 12-month warranty through Mascom International, covering manufacturing defects under normal operating conditions. Lightning strikes, surge damage, liquid ingress, and unauthorised firmware modification fall outside coverage. Our Nairobi CBD service desk processes claims directly. Keep a configuration backup file, since our technicians can restore extensions, trunks, and call routes onto a replacement appliance within minutes rather than rebuilding your dial plan.
Where to Buy the Grandstream UCM6304 IP PBX in Kenya
Grandstream UCM6304 IP PBX is available now at Mascom International, located at Old Mutual Building, First Floor Room 4, Kimathi Street, Nairobi CBD. Visit our store Monday through Saturday, 9:00 AM to 7:00 PM, to see the UCM6304 powered up and running a live extension before purchase. We also stock the UCM6301, UCM6302, and UCM6308 for smaller and larger deployments.
Order through any of the following:
- Phone/WhatsApp: +254 708 852 521
- Email: info@mascomintl.com
- Website: www.mascomintl.com
Mascom International ships the Grandstream UCM6304 across all 47 Kenyan counties with pay-on-arrival delivery you only pay when the appliance reaches you. Nairobi and its environs receive same-day delivery. All other major cities and towns, including Mombasa, Kisumu, Nakuru, and Eldoret, receive next-business-day delivery. Mandera, Wajir, Marsabit, Lamu, Tana River, and Turkana receive delivery within 2-3 business days.
Every unit is backed by the 12-month warranty above, with claims coordinated at our Nairobi CBD service desk. Buyers across Kenya rely on Mascom International for honest specifications, current pricing, and installation support on every telephony appliance we stock.
Disclaimer: We can not guarantee that the information on this product is 100% correct
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