Grandstream UCM6308A Audio IP PBX with 1,500 Users, 8 FXO and 8 FXS

The Grandstream UCM6308A is the largest model in the UCM6300 Audio series: voice-only, 1,500 users, 200 concurrent calls and 8 FXO plus 8 FXS ports in a rack chassis. It suits sites with many landlines that need calls and audio meetings but no video.

====

The Grandstream UCM6308A is the largest voice-only PBX in the UCM6300 Audio series, packing 8 FXO ports for landlines and 8 FXS ports for analog phones into one rack chassis. It handles 1,500 users and 200 concurrent calls. It is a good match for sites with many landlines and scattered analog handsets that have no use for video meetings.

Grandstream UCM6308A specifications

• 1,500 users and 200 concurrent G.711 calls, 150 of them SRTP-encrypted.
• 8 FXO and 8 FXS RJ11 ports, all with lifeline.
• 3 Gigabit Ethernet ports with switch or NAT router mode.
• 2 USB 3.0 ports and an SD slot.
• 128×32 dot-matrix LCD and status LEDs.

Sixteen analog ports in one rack unit

Warehouses, factories and older school buildings often run several landlines and analog phones at gates and stores. The UCM6308A terminates eight landlines and drives eight analog devices without a separate gateway. It fits a 19-inch rack beside your switches or sits on a desk, measuring 485 × 187.2 × 46.2 mm and weighing 2,538 g. The back panel has two DC 12V power jacks rather than one.

Voice-only by design

If your phones are for calls, transfers and queues, and nobody runs video meetings on the PBX, the audio edition gives you the same ports and chassis as the UCM6308 without a feature you would not use. You still get unlimited voice and web meeting rooms, with up to 9 public rooms at once and up to 150 participants in total.

Call center and apps

• IVR up to 64 layers in several languages, so callers can choose a department or branch.
• Queues with ACD based on agent skill, availability and workload.
• The free Grandstream Wave app on mobile, desktop and browser.
• UCM RemoteConnect for remote access, GDMS for cloud management and an API for CRM and PMS.
• Hot Standby with a second unit of the same model.

Where the UCM6308A fits in Saudi Arabia

• Warehouses and distribution centers in Riyadh and Dammam with analog phones at the gates and landlines for customers.
• Factories in industrial cities needing office extensions plus analog phones on the production floor.
• Schools and education complexes with several landlines, a fax and admin extensions.
• Voice call centers handling 200 simultaneous calls with queues and ACD.
• Small hotels and serviced apartments with analog room phones on FXS ports and a landline at reception.

Recordings and backups

Call recordings and voicemail go to an SD card or a USB drive on the USB 3.0 ports, and the same storage holds a configuration backup before any firmware update, with no extra server.

Compatibility and security

Grandstream endpoints such as GRP2600 phones and DP700 DECT systems are provisioned automatically with zero config, and any SIP phone can register. Secure boot, a unique device certificate, SRTP and TLS protect the system.

UCM6308A vs UCM6308 vs UCM6304A

The UCM6308 shares the chassis and ports but adds video meetings and raises capacity to 3,000 users and 450 calls. The UCM6304A is a smaller wall-mount unit for 1,000 users and 150 calls with 4 FXO and 4 FXS. Go with the UCM6308A when you need more than four landlines, rack mounting and voice only.

Frequently Asked Questions

Does the UCM6308A support video meetings?

No. It belongs to the audio series and hosts voice and web meetings for up to 150 participants. For video, choose the UCM6308.

How many landlines and analog phones can I connect?

Eight landlines on the FXO ports and eight analog phones or fax machines on the FXS ports, all with lifeline.

Is it rack-mountable?

Yes. The 485 mm chassis fits a 19-inch rack or sits on a desk.

Specifications

• Model: UCM6308A
• Series: UCM6300 Audio Series
• Users: 1,500
• Concurrent calls (G.711): 200
• Concurrent SRTP calls (G.711): 150
• Meetings: Voice and web meetings, unlimited rooms, up to 9 simultaneous public rooms, up to 150 participants across all rooms
• FXS ports: 8 × RJ11, all with lifeline
• FXO ports: 8 × RJ11, all with lifeline
• Network: 3× self-adaptive Gigabit RJ45 with integrated PoE+, switch or NAT router mode
• 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
• Power: 2× DC 12V jacks; input 100–240 VAC 50/60 Hz, output 12 V DC 2 A
• Dimensions: 485 × 187.2 × 46.2 mm
• Weight: 2,538 g
• Mounting: Rack mount or desktop
• IVR and call center: IVR up to 64 layers, multi-language; multiple queues, ACD by agent skill, availability and workload, in-queue announcements
• Voice and fax 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
• Security: SRTP, TLS, HTTPS, SSH, 802.1X; secure boot, unique certificate, random default password
• Apps and management: Wave app (Android, iOS, desktop, web), UCM RemoteConnect, GDMS cloud management, API for CRM and PMS, Hot Standby
• Software base: Asterisk 16
• 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)

Features

• 8 FXO + 8 FXS ports with lifeline: eight landlines and eight analog phones or faxes on one unit.
• 1,500 users and 200 concurrent G.711 calls: the top capacity in the UCM6300 Audio series.
• 485 mm rack chassis with LCD and status LEDs: fits a 19-inch rack or a desk.
• Audio meetings for up to 150 participants and 9 public rooms at once: no outside platform needed.
• Two DC 12V power jacks: two power inputs instead of one.