Small Business VoIP System UK: Costs, Setup & Best Options 2026

Last updated: April 2026

If you run a small business in the UK, your phone system is one of those things you probably do not think about until it causes a problem. Maybe you are still limping along with a traditional landline. Maybe you are routing everything through personal mobiles. Either way, the PSTN switch-off completing in January 2027 means every traditional phone line in the country is being turned off permanently. You need a VoIP system, and there is no getting around it.

The good news? VoIP is not just a replacement for what you have. It is a genuine upgrade. Lower costs, better features, more flexibility, and no expensive hardware sitting in a cupboard. We have helped over 2,000 UK businesses make this switch since 2008, and the overwhelming feedback is the same: they wish they had done it sooner.

This guide covers everything a small business with 2 to 20 users needs to know about choosing, costing, and setting up a VoIP phone system in 2026.

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What Is a Small Business VoIP System?

VoIP stands for Voice over Internet Protocol. In plain English, it means making phone calls over your internet connection instead of a traditional copper phone line. A small business VoIP system takes this a step further by giving you all the features of a professional phone system (call transfers, voicemail, auto-attendant, call recording) without the expensive hardware that used to be required.

With a traditional phone system, you would buy a PBX box (the brains of the system), install it on your premises, wire up desk phones, and pay line rental plus per-minute call charges. That box alone could cost £2,000 to £10,000 depending on the size. Maintenance contracts on top. Engineer visits when something went wrong.

With VoIP, all that hardware and complexity disappears. Your provider hosts the phone system in the cloud. You plug in IP desk phones, use a softphone app on your computer, or take calls on your mobile. The monthly cost per user covers everything: the system, calls, features, and maintenance.

For a small business, this is transformative. You get the same phone system capabilities as a company with 500 staff, but you are paying from £6+VAT per user per month instead of thousands upfront.

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Why Small Businesses Need VoIP Now (Not Later)

The PSTN Switch-Off Is Real

BT Openreach is switching off the entire Public Switched Telephone Network by January 2027. This is not optional, and it is not a rumour. Every traditional analogue phone line in the UK will stop working. If your business relies on one, you need to move to a digital alternative.

The switch-off is already well underway. Openreach stopped selling new PSTN lines in September 2023. Exchanges across the country are being decommissioned area by area. Waiting until the last minute means competing with every other business that also left it late, which means longer lead times and less support available.

Cost Savings Are Immediate

Most small businesses see a 30% to 50% reduction in their phone costs when switching to VoIP. The savings come from eliminating line rental charges, removing per-minute call costs (most VoIP plans include unlimited UK calls), and getting rid of hardware maintenance contracts.

Professional Image Without the Price Tag

A two-person business can have an auto-attendant ("Press 1 for sales, 2 for support"), professional hold music, a local or national number, voicemail to email, and call transfer between staff. On a traditional system, this kind of setup would cost hundreds per month. On VoIP, it is included in your standard plan.

Work From Anywhere

Every modern VoIP system comes with a mobile app and desktop softphone. Your team can take business calls on their personal phones without giving out personal numbers, work from home with the same phone system they use in the office, and transfer calls to colleagues regardless of where anyone is sitting.

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VoIP Costs Breakdown for 2 to 20 Users

Understanding VoIP pricing is straightforward once you know the components. Here is what a small business will actually pay.

Monthly Per-User Costs

Most small businesses with 2 to 10 users will find that a Standard plan covers everything they need. You get call recording (which is increasingly important for compliance), a proper auto-attendant, and the mobile app that lets staff take business calls on the go.

Hardware Costs

You have three options for handsets:

Use softphones only (£0): Download the app on your computer and mobile. No desk phones needed. Many small businesses go entirely softphone, especially if staff are mobile or hybrid.

Buy IP desk phones (£50-150 per handset): Brands like Yealink, Snom, Fanvil, and Grandstream offer excellent desk phones at this price range. Yealink is our most popular recommendation for small businesses. The phones are yours to keep and typically last 5 to 7 years.

Lease desk phones (£3-5 per handset per month): Spread the cost. Good if cash flow is tight or if you want to upgrade easily in the future. The provider handles replacements if anything goes wrong.

For premium desk phones from Cisco or Polycom, expect to pay £100 to £250 per handset, though these are generally overkill for a small business.

Total Monthly Cost Examples

Compare this to a traditional phone system for 10 users: £2,000 to £5,000 for the PBX hardware, £150 to £200 per month in line rental, plus call charges on top. VoIP pays for itself within months.

Ready to see exact pricing for your business? Get a free VoIP quote tailored to your team size.

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Features That Actually Matter for Small Businesses

VoIP providers love to list dozens of features. Here are the ones that small businesses actually use and benefit from daily.

Auto-Attendant (Virtual Receptionist)

This is the feature that makes a two-person company sound like a 50-person operation. Callers hear a professional greeting and menu ("Press 1 for sales, 2 for accounts, 3 for support") and get routed to the right person automatically. You record the greeting once and it handles every call. No receptionist needed.

Call Forwarding and Mobile App

When your team is out at meetings, working from home, or just away from their desk, calls can follow them. The mobile app rings at the same time as the desk phone, showing the business number to callers. Staff can make outgoing calls from the app that display the business number, not their personal mobile.

Voicemail to Email

Every voicemail lands in your inbox as an audio file with a transcript. No more dialling into a voicemail box and pressing buttons. You can read and prioritise messages between meetings without listening to each one.

Call Recording

Useful for training, compliance, and dispute resolution. Every call is recorded automatically and stored in the cloud. You can search, replay, and download recordings from any browser. For businesses in regulated industries, this alone justifies the upgrade from a basic to a standard plan.

Ring Groups and Hunt Groups

Set up groups so that when someone calls your main number, it rings all your sales team simultaneously (or in sequence). If nobody picks up after a set number of rings, it can overflow to a mobile, go to voicemail, or route to another team.

Out of Hours Routing

Set different routing rules for outside business hours. Calls can go to voicemail with a custom message, divert to an on-call mobile, or play an announcement with your opening hours. This updates automatically based on your schedule, including bank holidays.

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Comparing Small Business VoIP Systems

Not all VoIP systems are equal. Here is how the main options compare for a small business.

3CX: Our Top Pick for Small Businesses

We sell and support 3CX because, frankly, it offers the best value for UK small businesses. The licensing model means you pay per system rather than per user at certain tiers, which keeps costs down as you grow. It integrates with virtually every CRM, supports physical desk phones from all major manufacturers (Yealink, Snom, Fanvil, Grandstream, Cisco, Polycom, Panasonic, Gigaset), and the mobile app is rock solid.

As a 3CX partner, we handle the setup, configuration, number porting, and ongoing support. You deal with us directly rather than a faceless call centre.

Microsoft Teams Phone

If your business already runs on Microsoft 365, adding phone capabilities to Teams can make sense. Your staff already know the app, and it consolidates communication into one platform. The downside is that you need an M365 licence on top of the Teams Phone licence, and the telephony features are less mature than a dedicated VoIP platform. Call routing and auto-attendant configuration is less intuitive than 3CX.

When to Choose What

Choose 3CX if: You want the lowest cost per user, maximum flexibility, wide hardware compatibility, and dedicated UK support through a local partner.

Choose Teams Phone if: Your entire team already lives in Microsoft Teams and you want one fewer app to manage.

Choose RingCentral if: You plan to scale beyond 20 users quickly and want an all-in-one communications platform with built-in video conferencing.

Not sure which system suits your business? Get a free comparison quote and we will recommend the best fit based on your needs.

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How to Choose the Right VoIP System

Step 1: Count Your Users

How many people need to make and receive calls? Include part-time staff and anyone who might need the mobile app, even if they do not have a desk phone. This number determines your monthly cost.

Step 2: List Your Must-Have Features

For most small businesses, the essential features are: auto-attendant, call forwarding to mobile, voicemail to email, and call recording. If you need CRM integration or call analytics, you will need a standard or premium plan.

Step 3: Check Your Broadband

VoIP requires decent internet. Each concurrent call uses about 100kbps of bandwidth. For a business with 5 users, you need at least 10Mbps upload speed (which most business broadband provides easily). If your current broadband is unreliable, consider upgrading. We offer Sky SOGEA broadband at 80Mbps download and 20Mbps upload for £35+VAT per month, which comfortably supports 20+ simultaneous VoIP calls.

For more on common broadband and call quality issues, see our guide to VoIP problems and solutions.

Step 4: Decide on Hardware

Do you need desk phones, or will softphones on computers and mobiles suffice? Many small businesses start with softphones and add desk phones later for reception or shared areas. There is no wrong answer here.

Step 5: Consider Number Porting

You can keep your existing phone numbers when switching to VoIP. The porting process typically takes 5 to 10 working days, during which there is no downtime. Your provider handles all the paperwork with your current carrier.

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The Setup Process: What to Expect

Setting up a VoIP system for a small business is far simpler than most people expect. Here is the typical timeline when working with us.

Week 1: Consultation and Quote

We discuss your requirements: how many users, what features you need, whether you want desk phones, and any specific call routing requirements. You receive a detailed quote within 24 hours.

Week 1-2: Configuration

We configure your VoIP system in the cloud: setting up user accounts, building your auto-attendant, configuring ring groups, recording greetings, and preparing your call routing rules. If you have ordered desk phones, they ship pre-configured to your address.

Week 2-3: Number Porting

We submit the porting request to move your existing numbers across. This runs in the background and typically completes within 5 to 10 working days. During porting, your old phones continue working normally.

Porting Day: Go Live

On the day your numbers port across, calls start arriving on your new VoIP system. Desk phones are already configured and ready. Mobile apps are installed. The transition is seamless from your callers' perspective.

Ongoing: Support

If anything needs adjusting (new user, changed routing, additional features), you contact us directly. No call centre queues, no ticket numbers. We are a UK based team in Shrewsbury and we pick up the phone.

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Broadband Requirements for VoIP

One of the most common questions we get is whether existing broadband can handle VoIP. The short answer for most businesses is yes.

Minimum Requirements

Most UK business broadband connections comfortably exceed these requirements. If you are on a standard FTTC connection with 40-80Mbps download and 10-20Mbps upload, you can run 20+ VoIP calls simultaneously without any issues.

The more important factor is connection stability rather than raw speed. A stable 20Mbps connection is better for VoIP than a flaky 100Mbps one. If your broadband frequently drops out or slows down during peak hours, consider upgrading to a dedicated business connection before switching to VoIP.

We provide Sky SOGEA broadband at 80/20Mbps for £35+VAT per month, which is purpose-built for businesses running VoIP. For a deeper look at choosing the right VoIP setup, see our complete hosted VoIP guide.

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Common Concerns (and Why They Should Not Stop You)

"What if the internet goes down?"

Modern VoIP systems handle this gracefully. If your broadband drops, calls automatically divert to mobile phones via the app (which switches to 4G/5G) or to a pre-configured failover number. You never miss a call.

"Will call quality be as good as a landline?"

On a decent broadband connection, VoIP call quality actually exceeds traditional landlines. VoIP supports HD voice codecs that deliver clearer, richer audio than the 3.4kHz bandwidth of a traditional phone line.

"Is it secure?"

VoIP calls are encrypted using TLS and SRTP protocols. This is actually more secure than traditional phone lines, which transmit voice as unencrypted analogue signals over copper wires.

"Can I keep my phone number?"

Yes. Number porting is standard practice. Your existing number transfers to your new VoIP system at no extra charge in most cases. The process takes 5 to 10 working days and there is no disruption during the transfer.

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VoIP for Specific Small Business Types

Offices (Accountants, Solicitors, Consultants)

Standard VoIP with desk phones for each staff member, auto-attendant to route calls between departments, and call recording for compliance. A 5-user office typically pays £50-75 per month.

Retail and Hospitality

Cordless DECT handsets so staff can move around the shop or hotel. Integration with booking systems where available. Out of hours routing to handle calls after closing time.

Trades and Field Workers

Mobile-first VoIP with the app on every phone. Calls come through as the business number even when engineers are on site. Voicemail to email so messages are not missed between jobs. For a detailed look at this, see our guide on business phone systems for electricians.

Home-Based Businesses

Softphone on a laptop or mobile. A proper business number rather than giving out your personal mobile. Professional auto-attendant and voicemail. Costs from £6+VAT per month for one user.

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Frequently Asked Questions

How long does it take to set up a VoIP system for a small business?

From initial consultation to being fully live with ported numbers, the typical timeline is 2 to 3 weeks. The system itself can be configured and ready to use within days. The main variable is number porting, which depends on your current provider releasing the numbers.

Can I use my existing desk phones with a new VoIP system?

If you have SIP-compatible IP phones, yes. If you have traditional analogue phones, you would need adapters (ATAs) or new IP handsets. In most cases, buying new Yealink or Snom phones at £50-100 each is more cost effective and reliable than adapting old equipment.

What happens if I need to add more users later?

Adding users is instant. You log into the admin portal (or ask us to do it), add a new user, and assign them a phone or softphone app. No engineer visits, no hardware changes, no waiting. This is one of the biggest advantages VoIP has over traditional systems.

Do I need a special router for VoIP?

No, but a router that supports QoS (Quality of Service) is recommended. QoS prioritises voice traffic over other data, ensuring calls remain clear even when someone is downloading large files. Most modern business routers support this. We can advise on router settings during setup.

Is VoIP reliable enough for a business?

Yes. Modern cloud VoIP platforms run on redundant infrastructure across multiple data centres. Uptime guarantees of 99.9% or higher are standard. That is more reliable than a traditional phone line, which has a single point of failure at your premises.

Can I have a mix of desk phones and softphones?

Absolutely. This is the most common setup we install for small businesses. Reception might have a desk phone, office staff use softphones on their computers, and field workers use the mobile app. All are connected to the same system and can transfer calls between each other seamlessly.

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Next Steps

The best time to switch to VoIP was a year ago. The second best time is now. With the PSTN switch-off deadline approaching in January 2027, every month you wait is a month closer to being forced into a rushed migration.

We have been helping UK businesses with their telecoms since 2008. We are OFCOM regulated, ICO registered, and rated 4.3 out of 5 on Trustpilot from over 1,000 reviews. We are not a VoIP provider ourselves, which means we recommend the best system for your business rather than pushing our own product.

Get your free VoIP quote now. Tell us your team size and what you need, and we will come back with a clear recommendation and pricing within 24 hours. No sales pressure, no obligation, and no 45 minute demo calls. Just straightforward advice from people who have done this thousands of times.

For a broader overview of hosted VoIP options, read our full hosted VoIP for business guide. Or if you are already on VoIP and having issues, check our VoIP problems and solutions troubleshooting guide.