Grandstream UCM6301 IP PBX – 1 FXS + 1 FXO, 500 Users & 75 Calls for Small Hybrid Offices

If your small office still uses a traditional phone line for a fax machine, credit card terminal, or backup, the Grandstream UCM6301 makes the transition to modern VoIP simple and affordable. This compact IP PBX supports up to 500 users and 75 simultaneous calls while giving you one analog phone port and one PSTN line connection right out of the box.

It combines voice, video conferencing, mobility, and management tools in one appliance. Employees can use desk phones, the free Wave app on their phones or computers, or even web browsers to stay connected. A bright color touchscreen on the front makes quick status checks and basic changes easy without a laptop.

Whether you run a small team, a satellite office, or a business that needs reliable hybrid connectivity, the UCM6301 delivers professional features at a practical size and price.

The Telecom Spot Take

The UCM6301 is the right fit for small offices that want modern calling and video tools without giving up their existing phone line or fax machine. The built-in FXS and FXO ports with lifeline support mean you can keep one traditional number active for critical uses while moving the rest of your team to IP phones or the free Wave app.

The color touchscreen is genuinely useful for quick on-site checks, and Grandstream’s GDMS cloud platform lets you manage the system remotely with almost no extra effort. It offers clear headroom for growth up to 500 users and 75 concurrent calls. For businesses that need more analog ports or higher capacity later, stepping up to the UCM6302 or UCM6304 in the same series is straightforward. This model keeps things simple, secure, and scalable exactly where most small teams actually operate.

Key Features

• Hybrid 1 FXS + 1 FXO Ports with Lifeline — Plug in an existing analog phone, fax, or credit card terminal and keep your current PSTN line. The lifeline feature automatically routes analog calls during power outages so critical communications stay up.
• Room to Grow – 500 Users & 75 Concurrent Calls — Handles the calling needs of most small businesses and branch offices with plenty of headroom. Supports both SIP desk phones and soft clients.
• Built-in Video Conferencing & Meetings — Host meetings with video directly on the PBX. Supports up to 4 simultaneous public rooms, 75 total participants across all rooms, and up to 9 video feeds per room. Works with Grandstream endpoints, desktops, and the Wave app.
• Free Wave App for Mobile & Desktop — Employees make and receive calls, join video meetings, chat, share files, and view call history from iOS, Android, Windows, Mac, or web browsers. No per-user licensing fees.
• Color Touchscreen LCD for Easy Local Management — The 320×240 color display shows status, IP address, and lets you perform basic tasks like reboots or network checks directly on the unit.
• Three Gigabit Network Ports with PoE+ — Flexible WAN/LAN/switch modes plus PoE+ support. Built-in NAT router and automated firewall traversal simplify secure remote connections.
• Strong Security & High Availability — Secure boot, unique certificates, random default passwords, SRTP/TLS encryption, and support for hot-standby high availability pairing keep your system protected and resilient.
• Cloud Management with GDMS — Grandstream’s free Device Management System lets you provision, monitor, update firmware, and troubleshoot from anywhere. Ideal for businesses with multiple locations or limited on-site IT time.
• Rich Business Calling Features — Call queues with skill-based routing, customizable IVR up to 64 levels, call recording, voicemail-to-email, paging/intercom, call parking, ring groups, time-based routing, and more — all included.

Technical SpecificationsCapacity

• Maximum SIP Users: 500
• Maximum Concurrent Calls (G.711): 75
• Maximum Concurrent SRTP Calls: 50
• Meeting Capacity: Up to 4 simultaneous public rooms; maximum 75 participants total across all rooms; up to 9 video feeds per room

Hardware Interfaces

• Analog Ports: 1 FXS (RJ11), 1 FXO (RJ11) with lifeline capability
• Network: 3 × self-adaptive Gigabit RJ45 ports (switched, routed, or dual mode) with PoE+
• USB: 1 × USB 3.0
• Storage: 1 × SD card slot
• Display: 320 × 240 color touchscreen LCD
• Other: Reset button, ground terminal

Physical & Environmental

• Dimensions: 270 mm (L) × 175 mm (W) × 36 mm (H)
• Unit Weight: 715 g
• Mounting: Desktop or wall mount (rack mount sold separately)
• Power: 12V DC power adapter (included)
• Operating Temperature: 0 °C – 45 °C (32 °F – 113 °F)
• Storage Temperature: -10 °C – 60 °C (14 °F – 140 °F)
• Humidity: 10–90% RH, non-condensing

Software & Protocols

• Based on Asterisk 16
• Voice Codecs: Opus, G.711 A-law/U-law, G.722, G.722.1, G.723.1, G.726, G.729A/B, iLBC, GSM; T.38 fax
• Video Codecs: H.265, H.264, H.263, H.263+, VP8
• Network Protocols: SIP, TCP/UDP, RTP/RTCP, SRTP, TLS, HTTP/HTTPS, STUN, OpenVPN, IPv6, and more
• QoS: Layer 2 (802.1Q/p) and Layer 3 (ToS, DiffServ)
• Security: Secure boot, unique certificate, SRTP, TLS, HTTPS, SSH, 802.1X

Comparison at a GlanceFeatureUCM6301UCM6302UCM6304FXS + FXO Ports1 + 12 + 24 + 4Max SIP Users5001,0002,000Max Concurrent Calls75150300Max Meeting Participants75 total150 total200 totalBest ForSmall offices needing 1 analog line/faxGrowing teams with moderate analog needsLarger departments or multi-line hybrid setupsFrequently Asked QuestionsHow many users and calls can the UCM6301 handle?

It supports up to 500 registered SIP users and 75 concurrent calls (50 when using SRTP encryption). This covers the needs of most small businesses and branch offices with room to grow.

Can I keep using my existing fax machine or phone line?

Yes. The built-in FXS port connects an analog phone or fax machine, and the FXO port connects your traditional PSTN line. Lifeline support keeps the analog connection working during power outages.

Does it support video conferencing?

Yes. The built-in conferencing platform supports video meetings with up to 9 video feeds per room and a total of 75 participants across all active rooms. It works with Grandstream video phones, the Wave app, and desktop clients.

What app do remote or hybrid workers use?

The free Grandstream Wave app is available for iOS, Android, Windows, Mac, and web browsers (Chrome/Firefox). Users can make/receive calls, join video meetings, chat, and access call history and contacts.

How do I manage the system if I’m not on site?

You can access the full web interface from any browser. For easier multi-site or remote management, use Grandstream’s free GDMS cloud platform to provision, monitor, and update devices centrally.

Is the UCM6301 secure enough for business use?

Yes. It includes secure boot, unique device certificates, random default passwords, SRTP media encryption, TLS signaling encryption, and support for high-availability failover pairing.

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Additional Information: Unless otherwise stated in description, returns are accepted within 30 days from date of invoice. A RMA number must be requested before returning any tiems. Merchandise must be in its original condition, unopened and unuséd. Sales on software and licenses are final and not eligible for refund. Buyer is responsible for return shipping, and all returns are subjected to a 20% restocking fee. If the RMA procedures are not followed we may in our sole discretion reject the entire return or choose to impose additional charges against the customer for replacement of the missing item(s). Refunds will be given as merchandise credit. integration by