Grandstream UCM6301 IP PBX

The Grandstream UCM6301 is an on-site IP PBX — the phone system itself, not a subscription to somebody else's. It handles up to 500 users and 75 concurrent calls, which in practice covers a business far larger than the price suggests, because concurrent calls, not headcount, is what actually runs out.

It has one FXS and one FXO port. The FXO takes a real analogue exchange line; the FXS drives an analogue device. Both have lifeline capability, so if the power fails the analogue phone still reaches the analogue line — which is why sites with a lift phone or an alarm line keep a UCM rather than moving everything to the cloud.

Calls, voicemail, IVR menus, call queues, conferencing and the Wave app for desktop and mobile all run on the box. There is no per-seat licence for the core telephony.

Key features

• Up to 500 users — registered SIP endpoints
• 75 concurrent calls — the number that usually decides the model
• 1 FXS and 1 FXO port — one analogue device and one analogue line
• Lifeline on the analogue ports — the analogue phone still works in a power cut
• Gigabit networking — router or switch mode
• Full PBX features — voicemail, IVR, call queues, ring groups, call recording
• Wave app — desktop, mobile and web softphone included
• Video and audio meetings — hosted on the PBX itself
• Expandable with gateways — add analogue capacity with a GXW or HT gateway
• No per-seat licence for core telephony

Works with

• UCM6302 — 1000 users, 150 calls, 2 FXS + 2 FXO
• UCM6304 — 2000 users, 300 calls, 4 FXS + 4 FXO
• UCM6308 — 3000 users, 450 calls, 8 FXS + 8 FXO
• Grandstream GRP desk phones — zero-touch provisioning from the UCM
• Grandstream DECT cordless — register handsets to the same system
• HT818 — add 8 analogue extensions

Frequently asked questions

500 users but only 75 calls — which number matters?

Concurrent calls, almost always. A business with 150 staff rarely has more than 30 calls up at once. Size on the busiest ten minutes of your week, not on headcount.

What is the difference between FXS and FXO?

FXO takes a line in — plug an analogue exchange line into it. FXS gives a line out — plug an analogue phone, fax or door phone into it. The UCM6301 has one of each.

What happens in a power cut?

The analogue ports have lifeline capability: the FXS port is connected through to the FXO line so an analogue handset can still dial out. IP phones, naturally, need power and network like anything else.

Do I still need a SIP provider?

Yes — the UCM is the phone system, not the phone lines. It connects to your SIP trunk provider, or to analogue lines through the FXO port, or both.

Is there a licence cost?

Not for core telephony — users, calls, voicemail, IVR and queues are included. Optional extras such as UCM Remote Connect for VPN-free remote working are separate subscriptions.

Can I add more analogue ports later?

Yes. Peer a GXW or HT gateway to the UCM and the analogue capacity grows without replacing the PBX.

Sizing a phone system? Call 0333 242 1314 or email sales@clisecure.com — tell us the staff count, the busiest hour and how many analogue devices there are, and we will size it properly.