What is Hosted PBX?

If you’re running a UK business and still relying on a traditional phone system, you’ve probably heard the term “hosted PBX” thrown around — but what does it actually mean, and is it the right move for your organisation?

In short, a hosted PBX (Private Branch Exchange) is a cloud-based telephone system managed by a third-party provider. Instead of having bulky hardware on-site, your phone system lives in the cloud. Your calls are routed via the internet, and you simply pay a monthly subscription per user.

This guide breaks down everything UK business owners and managers need to know about hosted PBX — from how it works to what it costs and who it’s suited for.

How Does Hosted PBX Work?

Traditional PBX systems require physical hardware installed at your premises — a cabinet full of circuit boards, cabling, and handsets. When you need to add a new line or extension, you typically have to call an engineer.

With a hosted PBX, all that infrastructure sits in your provider’s data centres. Your phones (either physical IP handsets or softphone apps on laptops/mobiles) connect to the internet and route calls through the cloud. Features like call routing, voicemail, call queues, and conference calling are all managed through a web-based admin portal — no engineer required.

The technology behind it is called VoIP (Voice over Internet Protocol), which converts your voice into digital data packets transmitted over your broadband connection.

Hosted PBX vs Traditional PBX: Key Differences

Understanding the difference between hosted and on-premise PBX helps you make an informed decision:

• Infrastructure: Traditional PBX requires on-site hardware. Hosted PBX is entirely cloud-based.
• Upfront costs: Traditional systems require significant capital expenditure. Hosted PBX is typically a monthly OpEx subscription.
• Scalability: Adding users to a hosted system takes minutes. Traditional systems require hardware upgrades.
• Maintenance: Traditional PBX requires ongoing maintenance contracts. Hosted PBX maintenance is handled by the provider.
• Features: Hosted PBX includes enterprise-level features (auto-attendants, CRM integration, call recording) as standard. Traditional systems often require costly add-ons.
• Remote working: Hosted PBX works anywhere with internet. Traditional PBX ties you to the office.

The Benefits of Hosted PBX for UK Businesses

1. Significant Cost Savings

One of the biggest drivers for switching to hosted PBX is cost. UK businesses typically save 40-60% on their phone bills by moving away from traditional landlines. There’s no expensive hardware to purchase, no maintenance contracts, and you only pay for the users you actually have. Calls between extensions — even across multiple sites — are usually free.

2. Works Anywhere

Since the PSTN switch-off in the UK (planned for completion by December 2027), all businesses will eventually need to move to digital phone systems anyway. Hosted PBX gets you ahead of this transition. And because it’s cloud-based, your team can make and receive calls from anywhere — whether they’re in the office, working from home, or on the road.

3. Professional Features as Standard

With a hosted PBX, you get features that previously only large enterprises could afford:

• Auto-attendant (virtual receptionist)
• Call queuing and ring groups
• Voicemail to email
• Call recording and reporting
• CRM integration
• Video conferencing
• Mobile apps for iOS and Android

4. Easy to Scale

Adding a new member of staff? Simply log into your portal and add a new user — usually within minutes. No engineer visits, no hardware orders. Scaling down is equally straightforward, making hosted PBX ideal for businesses with fluctuating headcounts.

5. Reliability and Resilience

Good hosted PBX providers offer 99.99% uptime SLAs and host their infrastructure across multiple UK data centres. If your office broadband goes down, calls can be automatically diverted to mobile numbers or other sites — so your customers never hit a dead end.

What Does Hosted PBX Cost in the UK?

Pricing varies by provider and features, but as a general guide:

• Entry-level plans: from around £8-£12 per user per month
• Mid-range plans (with CRM integration, call recording): £15-£25 per user per month
• Enterprise plans (full feature set, SLAs, dedicated support): £30+ per user per month

Most UK providers offer inclusive call bundles to UK landlines and mobiles, so your monthly bill stays predictable. Compare this to traditional line rental plus call charges, and the savings quickly add up.

Setting Up a Hosted PBX: What to Expect

The setup process is far simpler than most business owners expect:

1. Choose your provider — Look for UK-based providers with good support, transparent pricing, and contract flexibility.
2. Port your existing numbers — Your current phone numbers can usually be transferred (ported) to the new system, so customers see no change.
3. Configure your system — Set up extensions, call routing, ring groups, and your auto-attendant via the web portal.
4. Deploy handsets or apps — Either ship IP phones to your team or simply install a softphone app on their existing devices.
5. Test and go live — Most providers offer a test period before you switch over fully.

The entire process can typically be completed in a few days, with minimal disruption to your operations.

Who is Hosted PBX Right For?

Hosted PBX suits a wide range of UK businesses, but it’s particularly well-suited for:

• SMEs (5-250 employees) who want enterprise features without the enterprise price tag
• Businesses with remote or hybrid workers who need a single phone system across multiple locations
• Growing businesses that need to scale their phone system quickly
• Businesses with multiple sites that want a unified system
• Any business still on ISDN/PSTN that needs to migrate before the 2027 switch-off

Frequently Asked Questions

Do I need fast broadband for hosted PBX?

A standard broadband connection is usually sufficient. Each active call uses approximately 85kbps of bandwidth. For most businesses, even a 10Mbps connection can comfortably support dozens of simultaneous calls alongside normal internet usage. Fibre broadband is recommended for larger teams.

Can I keep my existing phone number?

Yes — in the vast majority of cases, your existing geographic number (01/02) or non-geographic number (03/08) can be ported to your new hosted PBX system. This process typically takes 1-2 weeks.

What happens if my internet goes down?

Most hosted PBX providers offer automatic failover. If your internet connection fails, incoming calls can be automatically redirected to mobile numbers or an alternative number, ensuring you never miss a call.

Is hosted PBX secure?

Reputable UK providers use encrypted connections (TLS/SRTP) to protect your calls. Look for providers that are ISO 27001 certified and host their infrastructure in UK data centres.

What’s the difference between hosted PBX and VoIP?

VoIP is the underlying technology — it refers to making calls over the internet. Hosted PBX is a complete phone system that uses VoIP technology, but also includes all the management features, call routing, auto-attendants, and other capabilities you’d expect from a business phone system.

Do I need to buy new phones?

Not necessarily. Many providers offer softphone apps that work on computers and mobile phones you already own. If you prefer physical desk phones, IP handsets are generally inexpensive — often included in your contract or available for a small monthly add-on.

Ready to Switch to Hosted PBX?

The PSTN switch-off means the clock is ticking for UK businesses still on traditional phone systems. Moving to a hosted PBX now gives you time to migrate at your own pace, start saving money immediately, and gain features that help your business operate more professionally and flexibly.

At Just Business Phones, we help UK businesses find the right hosted PBX solution for their size, budget, and requirements. Get in touch today for a free, no-obligation consultation.