Emma Clarke joins MondaySales team · needs a line, day one
Zen SystemsZen Systems — adding ext. 214…Zen Systems — ext. 214 added
Emma’s Ext. 214 — live by 9am3CX welcome email sent to Emma
Same fixed price — £0 extraNo new licence · add users as you grow
3CXYour 3CX licence — ownedOne system price · add users freeUp to 50% less than per-user VoIP
Own your phone system

3CX — the phone systemyou own, not rent.

3CX is the business PBX that ends per-user pricing — calls, video meetings, live chat and AI in one system. Zen Systems is the UK Titanium Partner that makes it effortless.

Business VoIP Specialists Since 2009
99.99% SLA
Private Cloud Hosting
Meanwhile, on a per-seat platform…

Every month, the rent quietly goes up

New starter? New fee.

Their cloud, their rules.

Broken? Join the queue.

And it adds up — in money, and in headaches you never signed up for.

3CX works differently — one licence, sized by calls rather than people, running where you choose.

Zen Systems has moved hundreds of UK businesses onto 3CX — costs down, control back, and real people who answer. We’ll do the same for you.

Get my free quote

Free & no obligation — a quote tailored to your needs.

The difference with 3CX

Why businesses keep choosing 3CX

Save up to 50%¹

One licence sized by calls, not people. Hire ten more people — and your costs stay the same.¹

Answer like the business you are

A branded greeting — and an AI receptionist that understands why someone’s calling and routes them to the right person, every time.

Never miss a call

Queues, hold music and position announcements — with smart divert when you can’t answer.¹

Grow with the numbers to prove it

See exactly how the business is performing with AI transcription, sentiments and insight reports.

Work anywhere

One extension across desk phone, laptop and mobile — HD calls wherever the day takes you.

Switch off, properly

Closed hours, holidays and on-call rotas route calls exactly where you decide.

Monthly bill
3CX phone systemFixed
New users this month+6
Extra per-user fees£0.00
Bill unchanged — down 50% since switching¹
The per-seat difference−50%¹
Per-seat platform3CX with Zen Systems
Incoming call3CX · Calverton Engineering
AI receptionist answering
AI receptionist

No menus — callers just talk

“Hi — I’m calling about a delivery that was due at our Nottingham site today…”
Understood: delivery query→ Routed: Dispatch team ✓
Incoming call3CX · Calverton Engineering
Queue calls
Call fromSarah Mitchell0115 496 0000
···
Queue music — Sales Edit Play
Queue announcementi
Sales queue · this week
312+4%Answered 300Missed 1296%
Call recordings
10 Jun – 14:220:20
26 Jun – 11:556:41
0:35
AI insight
“Customer happy — upgrade agreed. Follow-up booked for Tuesday.”
Sentiment: positiveExplore 3CX AI →
TeamContactsDiallerRecents1Chat
Use office caller ID
Outbound number: 0115 496 0000
Daniel Okafor ext. 204Available — working from home
HD call · secure ✓
Office hours
MonTueWedThuFriSatSun
Set time
08:30 – 17:30
CancelSave
Holiday schedule0115 496 0000Night service active
Christmas shutdown
24 Dec – 2 Jan
Send voicemail to email
Voicemail sent to: office@calverton-eng.co.uk

¹ 3CX reports savings of up to 80% vs traditional providers; independent 2026 comparisons typically show 30–50% lower total cost than per-user platforms.

Get my free quote

Free & no obligation — a quote tailored to your needs.

Curious what you’d save?

See what owning your system saves you

Two numbers — how many people, what you pay now — and you’ll see the size of the difference per-user pricing is costing you. No details needed for the estimate.

  • Free — and no obligation
  • Your saving shown on screen instantly
  • Takes less than a minute
Free instant estimate

Make sure to include all your telecoms service and support charges, so our saving estimate is as accurate as possible.

On screen instantly — no email needed to see your number.

Indicative estimate only, confirmed at your consultation. Based on Zen Systems’ managed 3CX (Basic edition, 3-year term). UK landline and mobile calls included; international billed separately. All figures exclude VAT.

3CX
The platform, proven

More than 350,000 businesses globally trust 3CX

To power their everyday communications — including a few names you might recognise.

Air FranceMercedes-BenzCoca-ColaBMWHoliday Inn ExpressHondaNHSPizza HutWilsonPorscheRE/MAXToyotaAir FranceMercedes-BenzCoca-ColaBMWHoliday Inn ExpressHondaNHSPizza HutWilsonPorscheRE/MAXToyota
Due diligence, done

Everything you’d expect — included

Packed with 75+ features, included in every Zen Systems quote — here are the ones you’ll feel first.

HD calls
Queues & smart routing
Mobile & desktop apps
Video conferencing
Live chat · WhatsApp · SMS
AI receptionistAI edition
Call recording
Reports & wallboards
Microsoft Teams routing
CRM & 365/Google sync
Book my free consultation

A free 30-minute call — we listen first, no pressure.

A guide who's been here before

We get it — and we’re here to help.

When support goes quiet, it all lands on you — chasing tickets, calming colleagues. You shouldn’t have to carry that — that’s why we’re here. Making 3CX work beautifully has been Zen Systems’ focus for 17 years, so we know the platform — and the people behind it to get answers when others can’t. To your team, we’re simply the human face of 3CX: real people who pick up, sort it, and hand you back peace of mind.

Zen demonstrated very clearly their expertise with 3CX… they migrated us with grace, and our service now runs very smoothly.

Dan MilgramDan Milgram · Transpharmation Ltd

Why you can trust us

  • 3CX Titanium Partner — the highest tier
  • Hundreds of UK businesses served over 18 years
  • Private Cloud with a 99.99% uptime SLA
  • Backed by our Total Peace of Mind Guarantee
  • A stress-free 4-step migration — no downtime
3CX Titanium Partner
EquinixTelehouseVMwareGamma
Book my free consultation

A free 30-minute call — we listen first, no pressure.

Rated Excellent on Trustpilot

Take our word for it — and theirs.

“Zen demonstrated very clearly their expertise with 3CX… they migrated us with grace, and our service now runs very smoothly.”
Dan MilgramDan MilgramOwner, Transpharmation Ltd
“We moved from BT and it's been fantastic. The call quality is excellent and the system is incredibly user-friendly.”
Ross McArthurRoss McArthurHR Manager, Fife Creamery Ltd
“James and his team helped us implement 3CX and we're very pleased — it's very user-friendly, and their support resolves any issues quickly.”
JackieJackieBrooks Mayfield Accountants
Book my demo
Trustpilot
Read all our reviews on Trustpilot
Already on 3CX?

Get a free 3CX health check.

Crackly calls, tickets that go quiet, a setup nobody has looked at since the day it went in — it doesn’t have to be like that. Hosted by 3CX directly or with another partner, we’ll check what usually gets skipped — network readiness, broadband, QoS, configuration, licensing — and show you exactly how the problems you’re living with can be put right. No pressure either way.

Book my free 3CX health check

A free 30-minute call — we listen first, no pressure.

Getting there is simple

Three steps to a system you own

  1. 1

    Book a free consultation

    We listen first — your setup, your frustrations, where you want to get to. No pressure.

  2. 2

    Get a tailored plan & quote

    We design the right 3CX setup for you — no surprises, matched to what you actually need.

  3. 3

    We handle the switch

    We port your numbers and migrate you with zero downtime. You keep working; we do the heavy lifting.

Book my free consultation

A free 30-minute call — we listen first, no pressure.

No downtime, no drama

Safe switch, handled for you

Once you say yes, moving across is our job — not yours. Here’s how we make it effortless.

01

Discovery

We learn your current setup, needs and challenges.

02

Design

We craft the right features, configuration and integrations.

03

Prepare

We set up SIP trunks, private cloud, number ports and training.

04

Switch

We migrate you with no downtime — and stay with you after.

Book my free consultation

A free 30-minute call — we listen first, no pressure.

You’re in good company

Hundreds of businesses have already made the switch to Zen Systems

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Get my free quote

Free & no obligation — a quote tailored to your needs.

Your managed service includes

Everything’s included — one simple, fixed price.

A complete cloud phone system, tailored to you and quoted clearly. No hidden extras.

Your managed phone system

One plan from Zen Systems — everything below, in every quote.

Private cloud hostingSecure UK cloud, monitored 24/7 — nothing on-site to run.
Calls on any deviceDesk phone, laptop or mobile — one number.
Unlimited UK supportReal experts, whenever you need them.
Free UK callsLandline and mobile minutes included.
Advanced call handlingMenus, routing, recording and reporting — standard.
Fixed system priceAdd users as you grow, at no extra cost.
3CXBuilt on 3CXTitanium Partner — 3CX’s highest tier. Licence included.
Enterprise AI availableTranscription, sentiment and a 24/7 AI receptionist — on the AI edition.
Get my free quote

Free & no obligation — a quote tailored to your needs.

A word from the team

Why we bet on 3CX — and never looked back

We’ve been building phone systems for UK businesses since October 2007, and we became a 3CX partner back in 2009 — long before it was fashionable. The reason was simple: it was the first phone system that treated businesses like adults. One licence for the whole system instead of a charge for every person. Software that runs where you want it. No lock-in to one manufacturer’s handsets.

Read more

Seventeen years on, that bet has become our specialism. We’re now a Titanium (the highest tier) partner, and we’ve taken hundreds of UK businesses onto the platform: designed properly, migrated without drama, and looked after by real people who answer the phone. A 3CX phone system is a brilliant thing. A 3CX phone system with a team behind it is peace of mind.

If you’re weighing it up, don’t wrestle the forum threads alone. Bring us your questions — the consultation is free, we listen first, and you’ll leave knowing exactly what your system should look like, whether you buy it from us or not.

Book my free consultation

A free 30-minute call — we listen first, no pressure.

Straight answers

3CX, without the forum threads

What is 3CX used for?

3CX is a software-based business phone system (a PBX, built on the open SIP standard) used to run calls, video meetings, live chat, WhatsApp and SMS in one platform. It works in the cloud, on-premise on your own hardware, or a mix of both — and it’s licensed by simultaneous calls rather than per user, which is why it usually costs less as you grow. We use it because it lets businesses own their phone system rather than rent it.

Is 3CX a good phone system?

The software is excellent — that’s rarely where problems come from. Real-world 3CX experiences are decided by how it’s deployed and looked after: due diligence on the network, a properly sized licence, supported trunks, and a partner who answers. Run well, it’s outstanding value. Run as a sideline, it disappoints — which is why making it work beautifully is Zen Systems’ whole focus.

Why is 3CX so expensive?

It usually isn’t — for the 10-plus-person businesses 3CX now focuses on, independent comparisons typically put total cost 30–50% below per-user platforms. Quotes vary wildly, though, because the licence is only part of the picture: a flat annual licence sized by simultaneous calls, with hosting, SIP trunks, handsets and support added separately — often by different suppliers. Very small businesses can find it expensive at face value; from around ten people it usually flips firmly the other way. Zen Systems quotes one simple price with everything included, so there are no surprises.

Is 3CX free — and is it free forever?

Yes — 3CX’s free small-business tier (3CX SMB) is genuinely free for up to 10 users, indefinitely, with hosting included; you’ll still need a SIP trunk for your number and calls. There’s also a tiny free self-hosted edition (4 simultaneous calls). Fine ways for a small team to start — but growing businesses outgrow them quickly: queues, deeper integrations, intelligence and support live in the paid editions, which is where we come in.

Should we host 3CX in the cloud or on-premise?

That choice is one of 3CX’s real advantages — there are three routes. Most of our customers choose our private cloud, hosted in Equinix London with a 99.99% uptime SLA, so there’s no server to own or patch. 3CX also offers its own hosted option on public cloud, and you can self-host — on-premise or in your own cloud (Amazon, DigitalOcean, Azure or Google). It’s your call, and we’ll advise honestly.

Which phones work with 3CX?

Yealink, Fanvil and Snom are 3CX’s preferred handset makers — tested against every release, auto-provisioning in minutes. Others, like Grandstream, Polycom and Gigaset, are supported with limitations. Or skip handsets entirely and use the apps on laptop and mobile.

Do I need a SIP trunk?

Yes — it’s the line that connects your system to the phone network. We provide and manage the trunks as part of the service, so calls are one supplier’s responsibility: ours.

We already have 3CX — can Zen Systems take over the support?

Yes — it’s one of the most common ways businesses join us. Whether you’re hosted by 3CX directly or with another 3CX partner, the takeover is simple: your licence and configuration transfer to our care with no downtime, and anything provider-specific — like number porting — we map out together in your free 3CX health check.

Which 3CX edition do I need?

There are three paid editions. Basic covers dependable everyday calling — desk phones, the apps, auto attendant, voicemail. Pro adds the customer-facing layer: call queues, recording, queue reporting, CRM and Microsoft 365/Google integration, and multi-site working. AI adds the intelligence — the AI receptionist, transcription, sentiment and insights — plus resilience extras like built-in failover. We right-size the edition in your quote, and you can step up as you grow.

Should we self-manage 3CX or go fully managed?

Honest answer: it depends who you’ve got. If your IT team is comfortable running a phone system — patching, trunks, backups, upgrades — self-managing works well, and we’ll happily sell you the licence at a fair price and stay nearby. Most businesses choose our fully managed service instead: licence, hosting, SIP trunks and support in one price, with real people accountable for all of it. It’s the difference between owning a system and having to carry it.

Zen Systems

3CX Phone System is a brilliant thing.

3CX with a team behind it is Peace of Mind.

Zen Systems · Peace of mind in business telecoms
Ready when you are

Get 3CX — and a team that has your back.

Both are free and no-obligation — we listen first, no pressure.

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