The complete guide to hosted VoIP.
How hosted VoIP works, what it costs and why UK businesses are switching — a plain-English guide.
What is hosted VoIP?
Hosted VoIP (Voice over Internet Protocol) means your business phone calls are carried over the internet, with the phone system itself hosted in the cloud rather than on a box in your office. “Hosted” is the key word: there’s nothing on-site to maintain, and your provider runs, updates and supports the platform for you.
In practice, hosted VoIP and “cloud PBX” describe two sides of the same service — the VoIP part is the calling, the PBX part is the call-management brain. Together they give you a complete, modern phone system.
How does it actually work?
Each user gets an extension that can ring a desk handset, a computer app or a mobile app — or all three at once. When a call comes in, the cloud system routes it according to your rules: straight to a person, into a queue, through a menu, or out to mobiles. Calls travel as data over your internet connection to the public phone network.
Because the intelligence lives in the cloud, you can change anything — add users, redirect calls, open a new site — from a web portal in minutes.
Features and benefits
Hosted VoIP includes call routing, hunt groups, IVR menus, voicemail-to-email, call recording, mobile and desktop apps and reporting as standard. The big-picture benefits are lower cost, total flexibility (work from anywhere), easy scaling, and being ready for the PSTN switch-off.
It also future-proofs you: new capabilities, including AI call handling, plug into a cloud system in a way they never could with old hardware.
Is hosted VoIP reliable?
On a decent internet connection, hosted VoIP is highly reliable — the platform runs in resilient data centres with no single on-site point of failure. The main dependency is your connection, which is why we recommend the right business broadband or leased line and, where uptime is critical, automatic 4G/5G or Starlink failover.
If your internet does go down, calls can automatically divert to mobiles, so you stay reachable.
Hosted VoIP vs Teams vs traditional lines
vs Microsoft Teams: Teams adds calling into Teams — great if your team lives there. Hosted VoIP is a full phone system with handsets, queues and menus. We deliver either, or both.
vs traditional lines: analogue and ISDN are being retired by 2027, cost more and offer less. Hosted VoIP is cheaper, more flexible and switch-off ready.
How much does hosted VoIP cost?
Hosted VoIP is priced per user per month, often from around £5, with no large upfront cost. You only pay for the users you need, and there’s no separate line rental or maintenance contract.
Most businesses find it noticeably cheaper than their old system once line rental, maintenance and call charges are taken into account.
Direct provider, reseller or DIY: the buying routes compared
Hosted VoIP reaches you by one of three routes, and the route shapes everything downstream — support, price and who owns your problem. Here's the honest comparison:
| Route | What it means | The catch |
|---|---|---|
| Direct provider | You buy from the company operating the platform — they configure, support and own the outcome end to end. | Quality varies wildly by provider; use the ten-questions test below. |
| Reseller / white-label | A local firm selling someone else's platform under their brand. | Fine until something breaks two layers deep — ask plainly: "who actually runs the platform, and can you change it?" |
| DIY SIP | You buy raw SIP trunks and run your own PBX software. | Cheapest on paper, but you've just hired yourself as an unpaid telecoms engineer — sensible only with real in-house skill. |
Our position, stated openly: we operate and configure our own stack (including the AI layer at telexico.ai), which is why questions like "can it do X for my business?" get engineering answers rather than a ticket into someone else's queue.
The contract clauses that decide what you really pay
Four clauses do most of the damage in bad VoIP contracts. Auto-renewal: many contracts quietly roll into another full term unless you cancel inside a narrow window — diarise the window the day you sign, or better, refuse the clause. "From" pricing with per-minute calls: a £9.99 headline with metered calls routinely costs more than a £15 inclusive seat; demand the inclusive figure in writing. "Free" handsets: nothing is free — the hardware is amortised into the term, which is fine, until you see the exit fee that recovers it if you leave early. Ask what the handsets add to the exit calculation. Price-rise clauses: some contracts permit annual increases above inflation; a fixed price for the term is entirely negotiable and worth insisting on.
The pattern behind all four: the cheapest headline is engineered to be the most expensive commitment. Compare quotes over the full term, exit included — our savings calculator makes the arithmetic take thirty seconds.
Your first-week checklist
Before day one: confirm the number-port date in writing, record your greetings (or approve the voiceover), and agree the call flow on paper — who rings first, what happens at no-answer, what out-of-hours does. On day one: apps installed on every phone and laptop before the port completes, a test call through every path (main menu, each department, out-of-hours, voicemail-to-email), and one person nominated as the internal owner who knows how to change a greeting. By day seven: the first call report reviewed — answered rate, missed calls, ring times — and one tuning pass made. A provider who schedules that day-seven review with you unprompted is a provider who expects the numbers to look good.
The migration risk register — and how each risk dies
Five things go wrong in VoIP migrations, and every one is preventable. The port date slips — caused by paperwork mismatches with the losing provider's records; prevented by triple-checking the account details before submission, which is why we ask for a recent bill. Double-billing overlap — cancelling the old service is sequenced after the successful port, never before; the few days of overlap are cheap insurance against the alternative, which is losing the number. Staff quietly don't adopt it — prevented by installing the apps before port day and training exactly three actions (answer, transfer, voicemail), not thirty. The forgotten devices — alarm diallers, door entry and franking machines hanging off the old phone lines fail silently when those lines go; the pre-migration audit walks the building precisely to catch them. Day-one quality wobbles — prevented upstream by the line test and router QoS, and caught downstream by the day-seven report review. A provider who can recite this list unprompted has done it many times; one who's never heard of your alarm dialler is learning on your business.
Frequently asked questions
Is hosted VoIP the same as cloud PBX?
Effectively yes — hosted VoIP is the calling, cloud PBX the call-management brain. We deliver both as one system.
Do I need special equipment?
No — you can use VoIP handsets, a computer app or just your mobile.
Will it work if my internet goes down?
Calls can automatically divert to mobiles, and we can add failover so you stay online.
Can I keep my number?
Yes — we port your existing numbers across.
Is it better to buy from a reseller or the platform operator?
Either can work — the question that matters is who can actually change the platform when you need something. Ask 'who runs the infrastructure, and what happens when I need a feature configured?' A confident, specific answer is what you're buying.
What contract length should I agree to?
12–36 months is normal; longer terms cut the monthly price. The non-negotiables are a fixed price for the term, written exit terms, and no silent auto-renewal into another full term.
Can I trial hosted VoIP before committing?
Any confident provider will demonstrate live and often run a pilot — a handful of users alongside your existing system. If a provider resists letting you try it, believe them.
What happens at the end of my contract?
Your numbers are yours — they port to any new provider if you leave. Check before signing that the contract says so plainly; number-hostage clauses are the reddest of flags.
Is the cheapest hosted VoIP quote a false economy?
Usually — cheap headlines fund themselves through metered calls, hardware exit fees and offshore support. Compare the full-term cost including exit, and weight support quality heavily: you're buying the bad day, not the good one.
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