The Grandstream UCM6308 tops the UCM6300 series with 3,000 users, 450 concurrent calls, 8 FXO and 8 FXS ports and built-in video meetings. It is aimed at hospitals, universities, hotels and head offices that want calls and meetings on a single rack unit.
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The Grandstream UCM6308 is the flagship of the UCM6300 series. One rack unit registers 3,000 users and carries 450 concurrent calls, with 8 FXO ports for landlines and 8 FXS ports for analog devices. Hospitals, universities, hotels and head offices use it to run phones, video meetings and mobile calling from a single box.
Grandstream UCM6308 at a glance
- 3,000 users and 450 concurrent G.711 calls, 300 of them SRTP-encrypted.
- 8 FXO and 8 FXS RJ11 ports with lifeline.
- 3 Gigabit ports in switched, routed or dual mode.
- 2 USB 3.0 ports and an SD slot for recordings and voicemail.
- 128×32 LCD and status LEDs for power, ports and network.
Eight landlines, no gateway needed
Plenty of established organizations still have landline numbers their customers know by heart. The UCM6308 terminates eight of them directly and powers eight analog devices such as guard-room phones and fax machines, with lifeline on every port during a power cut. SIP trunks cover anything beyond that, and an FXS gateway like the GXW4232 handles large analog estates.
Video meetings for up to 300 people
Rooms are unlimited, with up to 25 public rooms running at once, up to 300 participants in total and 9 video feeds per room. H.265, H.264 and VP8 are supported, so people join from a video phone such as the GXV3450 or from the Wave app on mobile and browser. The weekly management call between Riyadh, Jeddah and Dammam can run on your own PBX.
Call center and IT tools
- IVR up to 64 layers in several languages.
- Queues with skill, availability and workload-based ACD, plus in-queue announcements.
- UCM RemoteConnect for secure remote users.
- GDMS cloud management for the PBX and endpoints, and an API for CRM and PMS.
- Secure boot, a unique device certificate, SRTP and TLS.
Where the UCM6308 fits in Saudi Arabia
- Large hospitals: extensions for every ward and nursing station, plus appointment queues.
- Hotels in Makkah and Madinah linking their PMS through the API.
- Universities and education complexes with extensions per college and landlines for administration.
- Call centers running hundreds of simultaneous calls with ACD and recording.
Device compatibility
The UCM6308 zero-config provisions Grandstream GRP2600 desk phones, GXV3400 video phones, DP700 DECT systems and GDS intercoms, and it registers standard SIP phones from any other vendor. Replacing an old PBX with many landlines? Move the lines to the FXO ports, add the new IP phones on the network and migrate departments in stages.
Recordings and backups
Call recordings, voicemail and configuration backups are stored on an SD card or a USB drive on the USB 3.0 ports, so supervisors can review call center calls and IT can restore settings without a separate server.
UCM6308 vs UCM6308A vs UCM6304
The UCM6308A uses the same rack chassis and the same 8 FXO and 8 FXS ports but is audio-only, with 1,500 users and 200 calls. The UCM6304 stops at 2,000 users and 300 calls with 4 FXO and 4 FXS. Pick the UCM6308 when you pass 2,000 users or need more than four landlines alongside video meetings.
Frequently Asked Questions
How many users and calls does the UCM6308 support?
3,000 users and 450 concurrent G.711 calls, including 300 SRTP-encrypted calls.
UCM6308 or UCM6308A?
Both are rack units with 8 FXO and 8 FXS. The UCM6308A is audio-only with 1,500 users and 200 calls; the UCM6308 adds video meetings and reaches 3,000 users and 450 calls.
Do video meetings need a separate subscription?
No. Meetings run on the PBX itself for up to 300 participants, joined from video phones or the free Wave app.
Specifications
- Model: UCM6308
- Series: UCM6300
- Users: 3,000
- Concurrent calls (G.711): 450
- Concurrent SRTP calls (G.711): 300
- Meetings: Unlimited rooms, up to 25 simultaneous public rooms, up to 300 participants across all rooms, up to 9 video feeds per room
- FXS ports: 8 × RJ11, all with lifeline
- FXO ports: 8 × RJ11, all with lifeline
- Network: 3× self-adaptive Gigabit RJ45 (switched, routed or dual mode) with PoE+
- Peripheral ports: 2× USB 3.0, 1× SD card
- Display: 128×32 dot-matrix graphic LCD with DOWN and OK buttons
- LEDs: Power 1/2, FXS, FXO, LAN, WAN, Heartbeat
- Reset: Long press: factory reset; short press: reboot
- IVR and call center: IVR up to 64 layers, multi-language; queues with ACD by agent skill, availability and workload
- Voice codecs: Opus, G.711 A/μ, G.722, G.722.1/1C, G.723.1, G.726-32, G.729A/B, iLBC, GSM; T.38 fax
- Video codecs: H.265, H.264, H.263, H.263+, VP8
- Security: Secure boot, unique certificate, random default password, SRTP, TLS, HTTPS, 802.1X
- Apps and management: Wave app (mobile, desktop, web), UCM RemoteConnect, GDMS cloud management, API
- Software base: Asterisk 16
- Power: Input 100–240 VAC 50/60 Hz; output 12 V DC, 2 A
- Dimensions: 485 × 187.2 × 46.2 mm
- Weight: 2,550 g
- Mounting: Rack mount or desktop
- Operating temperature / humidity: 0–45°C, 10–90% RH non-condensing
- Storage temperature: -10–60°C, 10–90% RH non-condensing
- Compliance: FCC Part 15 Class B and Part 68, CE, IC, RCM, UL (power adapter)
- In the box: UCM unit, power adapter, Ethernet cable, quick installation guide
Features
- 3,000 users and 450 concurrent G.711 calls: the highest capacity in the UCM6300 range.
- 8 FXO + 8 FXS ports with lifeline: eight landlines and eight analog devices without an extra gateway.
- Video meetings for up to 300 participants and 25 public rooms at once: branch meetings on your own PBX with no outside subscription.
- 300 SRTP-encrypted concurrent calls: call privacy for hospitals and financial offices.
- 3 Gigabit ports with NAT router mode: fits a 19-inch rack or a desk.