The question of VoIP vs landline is no longer a matter of preference — it is rapidly becoming a matter of necessity. With the UK’s Public Switched Telephone Network (PSTN) scheduled for complete shutdown by January 2027, every business still running traditional landlines will need to move to an internet-based alternative within the next twelve months.
But even setting the deadline aside, VoIP vs landline for business is a comparison that overwhelmingly favours Voice over Internet Protocol on almost every metric that matters: cost, features, flexibility, scalability and call quality. This guide walks you through every angle of the business phone system comparison so you can make a confident, informed decision.
If you are already sold on VoIP and want to understand the technology in depth, our HyperCloud Hosted VoIP Guide covers everything from how hosted VoIP works to choosing the right plan.
How Landlines Work
A traditional landline — also called a PSTN line or analogue phone line — transmits voice as electrical signals over copper wires. Your voice is converted into an analogue waveform at one end, carried through the telephone exchange network, and converted back into sound at the other end.
The system has been in place since the late 1800s and, to its credit, has been remarkably reliable. Landlines draw power from the exchange, so they work during power cuts and do not depend on your internet connection.
However, the infrastructure is ageing. BT Openreach has been maintaining copper lines for decades, and the cost of keeping them operational is rising. The network was designed for voice only, which means it cannot natively support video calls, instant messaging, presence indicators, call analytics or any of the features modern businesses rely on.
How VoIP Works
Voice over Internet Protocol (VoIP) converts your voice into digital data packets and transmits them over the internet. When you speak into a VoIP phone, softphone app or headset, your voice is digitised, compressed and sent to the recipient’s device, where it is reassembled and played back in real time.
Hosted VoIP — sometimes called cloud VoIP — takes this a step further. Instead of running your own telephone server on-site, a provider like Connection Technologies hosts the entire platform in secure UK data centres. You simply plug in your handsets or install a softphone app, and everything works through your existing broadband connection.
This architecture is what makes hosted VoIP vs landline such a lopsided comparison. Because the intelligence sits in the cloud, you get automatic updates, new features without hardware changes, and the ability to add or remove users in minutes rather than weeks.
For a deeper look at how hosted VoIP works and why it suits UK businesses, read our Hosted VoIP for Business UK 2026 guide.
VoIP vs Landline: Full Feature Comparison
The table below compares VoIP vs landline across every factor that matters to a UK business. Use it as a quick reference before we dive into each area in detail.
| Feature | Traditional Landline | Hosted VoIP |
|---|---|---|
| Monthly cost per user | £25–£45 | £5–£15 |
| Call charges (UK landlines) | Included or per-minute | Usually inclusive |
| Call charges (UK mobiles) | 10p–15p per minute | Usually inclusive |
| International calls | Expensive (varies by destination) | Low-cost bundles or per-minute |
| Hardware required | Desk phone + PBX on-site | IP phone, softphone app or headset |
| Upfront cost | £2,000–£10,000+ for PBX | £0–£100 per handset |
| Call quality | Analogue (3.4 kHz bandwidth) | HD audio (7 kHz+ wideband) |
| Video calling | Not supported | Built-in on most plans |
| Voicemail to email | Not available | Standard feature |
| Auto-attendant / IVR | Requires expensive add-on | Included |
| Call recording | Requires separate hardware | Built-in, cloud-stored |
| Call analytics | Very limited | Real-time dashboards and reports |
| CRM integration | Not possible | Native integrations available |
| Scalability | Requires new lines and hardware | Add users in minutes online |
| Remote / hybrid working | Not supported without divert | Full functionality from any device |
| Number porting | Slow (2–4 weeks) | Supported (5–10 working days) |
| Geographic numbers | Tied to physical location | Any UK area code, anywhere |
| Reliability / uptime | Very high (99.99%+) | 99.9%–99.999% with redundancy |
| Power-cut resilience | Works without mains power | Requires internet and power (mobile failover available) |
| Maintenance | On-site engineer visits | Managed remotely by provider |
| Future-proofing | End of life — PSTN closes Jan 2027 | Continually updated, fully supported |
| Contract length | 12–36 months typical | 1–24 months, flexible |
Cost Comparison: VoIP vs Landline
Cost is often the first thing business owners ask about, and it is where VoIP delivers the most dramatic advantage. Let us break down the numbers for a typical 20-user office.
Traditional Landline Costs
A traditional phone system for 20 users typically involves:
- On-site PBX hardware: £3,000–£8,000 upfront (or £150–£300/month on lease)
- ISDN/analogue line rental: £15–£25 per line per month (you will need 8–12 lines for 20 users)
- Call charges: £50–£150/month depending on volume
- Maintenance contract: £80–£200/month
- Engineer call-outs: £100–£250 per visit
Estimated monthly total for 20 users: £500–£1,000/month (excluding upfront hardware)
Hosted VoIP Costs
A hosted VoIP system for the same 20 users looks very different:
- Per-user licence: £5–£15/user/month (£100–£300/month for 20 users)
- IP handsets: £50–£100 each (one-off) or included on some plans
- Inclusive calls: UK landline and mobile calls typically included
- Maintenance: £0 — managed remotely by the provider
- Hardware: £0 upfront if using softphones on existing laptops and mobiles
Estimated monthly total for 20 users: £100–£300/month
Five-Year Total Cost of Ownership
Over five years, the difference is stark:
| Cost Element | Landline (5 Years) | Hosted VoIP (5 Years) |
|---|---|---|
| Hardware / PBX | £5,000 | £1,500 (handsets) |
| Line rental / licences | £12,000 | £12,000 |
| Call charges | £6,000 | £0 (inclusive) |
| Maintenance | £9,600 | £0 |
| Engineer visits | £2,000 | £0 |
| Total | £34,600 | £13,500 |
That is a saving of over £21,000 across five years — or roughly 61%. For smaller businesses the absolute numbers are lower, but the percentage saving is often even greater because VoIP plans start from just £5 per user per month.
Ready to switch from landlines to VoIP? Get a free hosted VoIP quote or call us on 0333 015 2615.
The 2027 PSTN Switch-Off: Why It Matters Now
In 2017, BT Openreach announced that the UK’s Public Switched Telephone Network would be switched off entirely by January 2027. This means every ISDN line, every analogue phone line and every piece of equipment that relies on the copper network will stop working.
The switch-off is not a vague future plan — it is already happening. Openreach stopped selling new ISDN lines in September 2023, and exchanges across the country are being migrated on a rolling basis.
What This Means for Your Business
- No more ISDN or analogue lines: You will not be able to renew your existing contract once it expires.
- Forced migration: If you have not moved by January 2027, your lines will be disconnected.
- Last-minute rush: Businesses that leave it late will face longer lead times for installation, number porting and hardware delivery.
- Potential downtime: A rushed migration increases the risk of misconfiguration, lost numbers and service interruptions.
The message is clear: the sooner you plan your move from landline to VoIP, the smoother and cheaper it will be. Our guide on preparing your business for the 2027 landline switch-off covers every step in detail.
Call Quality: HD Audio vs Analogue
One of the most persistent myths about VoIP is that call quality is poor. That may have been true in the early 2000s when broadband speeds were measured in kilobits, but in 2026 the reality is the opposite.
Landline Call Quality
Traditional analogue calls use a narrow frequency band of 300 Hz to 3,400 Hz. This was designed in an era when bandwidth was precious, and it means certain sounds — particularly sibilants like “s” and “f” — are clipped or distorted. You can hold a conversation, but the audio is noticeably flat and muffled compared to modern standards.
VoIP Call Quality
Modern VoIP systems use wideband audio codecs (such as G.722 or Opus) that capture frequencies from 50 Hz to 7,000 Hz or higher. The result is HD voice — richer, clearer audio where every word is distinct. Background noise cancellation, echo suppression and jitter buffering are handled automatically by the platform.
On a decent broadband connection (10 Mbps+ download, 1 Mbps+ upload), VoIP call quality is consistently superior to analogue. A single VoIP call uses roughly 80–100 kbps of bandwidth, so even a modest business broadband line can comfortably handle dozens of simultaneous calls.
Latency and jitter are the two factors that can affect VoIP quality. For a good experience, you need latency below 150 ms and jitter below 30 ms — thresholds easily met on any modern UK broadband connection. Quality of Service (QoS) settings on your router can prioritise voice traffic to eliminate any remaining issues.
Reliability and Uptime
Reliability is the one area where landlines have historically held an advantage, and it is worth examining honestly.
Analogue phones draw power from the telephone exchange, so they work during local power cuts. The PSTN has decades of redundancy built in, and outages are rare. VoIP, by contrast, depends on your internet connection and the provider’s platform.
However, enterprise-grade hosted VoIP platforms like Connection Technologies’ HyperCloud are built with geo-redundant data centres, automatic failover and 99.999% uptime SLAs. On the local side, you can mitigate internet outages with:
- 4G/5G mobile failover: Calls automatically route to mobile devices if broadband drops.
- Dual broadband connections: A secondary line from a different provider takes over instantly.
- Softphone apps: Staff can take calls on their mobile phones using the business number, even without office internet.
- UPS (Uninterruptible Power Supply): Keeps your router and IP phones running during short power cuts.
With these measures, VoIP reliability matches or exceeds traditional landlines — and you gain the ability to work from anywhere, which a landline can never offer.
Remote and Hybrid Working
This is where the VoIP vs landline business comparison becomes most one-sided. A traditional landline is physically wired to a desk in a specific building. If your staff work from home, travel frequently or split time between office and remote locations, a landline simply cannot follow them.
What VoIP Enables
- Work from anywhere: Staff can make and receive calls on their business number from a laptop, mobile or tablet — at home, in a café, or abroad.
- Single number, multiple devices: One business number rings on a desk phone, a mobile app and a desktop softphone simultaneously.
- Presence and status: Colleagues can see who is available, busy or in a meeting before calling.
- Unified communications: Voice, video, messaging and file sharing in a single platform.
- Hot-desking: Staff log into any desk phone and it becomes theirs, with their extension, voicemail and settings.
For businesses that have embraced hybrid working — which is the majority of UK businesses in 2026 — VoIP is not just better than a landline, it is essential.
Ready to switch from landlines to VoIP? Get a free hosted VoIP quote or call us on 0333 015 2615.
Security: VoIP vs Landline
Security is a legitimate concern for any business phone system, and both technologies have strengths and weaknesses.
Analogue phone lines are difficult to intercept remotely, but they are not immune to tapping — anyone with physical access to the copper line can listen in. There is no encryption, and call recordings are stored locally on hardware that may not be backed up.
VoIP calls travel over the internet, which introduces potential attack vectors such as eavesdropping, denial-of-service attacks and toll fraud. However, a well-configured hosted VoIP platform addresses all of these:
- TLS and SRTP encryption: Calls are encrypted in transit, making interception effectively impossible.
- Fraud detection: Automated systems monitor for unusual call patterns and block suspicious activity.
- Access controls: Role-based permissions, two-factor authentication and IP whitelisting protect the admin portal.
- Regular security updates: The provider patches vulnerabilities centrally — you do not need to manage firmware updates yourself.
- UK data centres: Reputable providers host data in ISO 27001-certified UK facilities, ensuring GDPR compliance.
For a detailed look at VoIP security, read our guide on how secure cloud-based telephony really is.
When a Landline Might Still Make Sense
There are a handful of scenarios where a traditional phone line may still be appropriate — at least until the PSTN closes:
- Locations with no broadband: A very small number of rural premises still lack reliable internet. In these cases, a landline may be the only option until connectivity improves.
- Lift and alarm lines: Some older lift emergency phones and intruder alarms rely on analogue lines. These will need upgrading to IP-compatible versions before 2027.
- Fax machines: If your business still relies on fax, analogue fax is more reliable than fax-over-IP — though digital fax services and email-to-fax are now mature alternatives.
For the vast majority of UK businesses, VoIP is the clear winner.
How to Migrate from Landline to VoIP
Switching is simpler than most businesses expect. Here is a typical migration path:
Step 1: Audit Your Current Setup
List every phone line, number, extension and piece of hardware you currently use. Note which numbers are customer-facing and must be kept.
Step 2: Check Your Broadband
You need around 100 kbps per concurrent call. A standard 80 Mbps FTTC connection handles well over 100 simultaneous calls, so most businesses are already covered.
Step 3: Choose Your VoIP Provider
Look for a provider that offers UK-hosted infrastructure, inclusive call bundles, a clear SLA, responsive support and the features your business needs. Connection Technologies’ HyperCloud Hosted VoIP platform ticks every box.
Step 4: Port Your Numbers
Your existing phone numbers can be transferred (ported) to your new VoIP service. This typically takes 5–10 working days and ensures customers and suppliers can still reach you on the same numbers.
Step 5: Configure and Test
Your provider sets up call routing, auto-attendant, voicemail, call groups and extensions. Testing is completed before go-live to ensure everything works as expected.
Step 6: Go Live and Decommission
On the agreed date, your numbers port across and your VoIP system goes live. Once confirmed working, cancel your old ISDN or analogue lines and stop paying for maintenance you no longer need.
Connection Technologies’ HyperCloud VoIP
Our HyperCloud Hosted VoIP platform is purpose-built for UK businesses that want enterprise-grade telephony without enterprise-grade complexity or cost.
What You Get
- Plans from just £5 per user per month — with inclusive UK landline and mobile calls
- HD voice quality on every call, powered by wideband audio codecs
- Softphone apps for Windows, Mac, iOS and Android — work from anywhere on your business number
- Auto-attendant and IVR to route calls professionally
- Call recording stored securely in the cloud with easy search and playback
- Real-time analytics and wallboards for call centre and sales teams
- CRM integrations with Salesforce, HubSpot, Microsoft Teams and more
- 99.999% uptime SLA backed by geo-redundant UK data centres
- Number porting — keep your existing numbers with no disruption
- Free onboarding and configuration — we handle the setup so you do not have to
Whether you are a five-person office or a 500-seat contact centre, HyperCloud scales with you. Add users, remove users, open new sites or enable remote workers — all from a simple web portal.
Why Choose Connection Technologies
Here is why businesses choose Connection Technologies:
- Independent and impartial: We are not tied to a single carrier. We recommend the solution that fits your business, not the one that earns us the biggest commission.
- UK-based support: Our team is based in the UK and available by phone, email and live chat. No overseas call centres, no chatbot runarounds.
- Managed migration: We handle every step — audit, number porting, configuration, testing and go-live support.
- Transparent pricing: No hidden fees. Plans from £5 per user per month with everything included.
- Proven track record: We have migrated hundreds of UK businesses from legacy systems to hosted VoIP, from sole traders to multi-site enterprises.
- Ongoing account management: A dedicated account manager reviews your usage, suggests optimisations and ensures you are on the best plan.
Ready to switch from landlines to VoIP? Get a free hosted VoIP quote or call us on 0333 015 2615.
Frequently Asked Questions
Is VoIP cheaper than a landline for business?
Yes, significantly. Hosted VoIP plans start from £5 per user per month with inclusive calls, compared to £25–£45 per line for a traditional system. Over five years, a 20-user business can save upwards of £20,000 by switching. There is no on-site PBX to buy, no maintenance contracts and no per-minute call charges for UK numbers.
Will my phone number change if I switch to VoIP?
No. You can port your existing geographic and non-geographic numbers to your new VoIP service. The process typically takes 5–10 working days, and there is no disruption to incoming calls during the switch. Your customers and suppliers will not notice any difference.
What happens to landlines in 2027?
BT Openreach is switching off the PSTN by January 2027. All analogue and ISDN lines will stop working. Businesses that have not migrated to VoIP or another IP-based solution will lose their phone service. The switch-off is already underway, with exchanges being migrated on a rolling basis.
Is VoIP call quality as good as a landline?
It is better. Modern VoIP uses wideband audio codecs that deliver HD voice quality — capturing a much wider frequency range than analogue lines. On a standard UK broadband connection, VoIP calls sound noticeably clearer and more natural. Each call uses roughly 80–100 kbps, so even modest connections handle multiple simultaneous calls with ease.
What internet speed do I need for VoIP?
Each concurrent VoIP call requires approximately 100 kbps of bandwidth. A standard 80 Mbps FTTC broadband connection can support well over 100 simultaneous calls. For most businesses, existing broadband is more than sufficient. If you have a large call centre, a dedicated leased line or FTTP connection is recommended for guaranteed quality.
Can I use VoIP on my mobile phone?
Yes. Most hosted VoIP providers offer softphone apps for iOS and Android. You can make and receive calls on your business number from your mobile, with the same features available on your desk phone — call transfer, voicemail, call recording and more. This is one of the biggest advantages of VoIP for businesses with remote or mobile workers.
Is VoIP secure enough for business use?
Yes. Enterprise-grade hosted VoIP platforms use TLS and SRTP encryption, automated fraud detection, role-based access controls and UK-hosted data centres with ISO 27001 certification. A well-configured VoIP system is more secure than an unencrypted analogue landline. Read our full guide on cloud telephony security for more detail.
How long does it take to switch from landline to VoIP?
A typical migration takes two to four weeks from consultation to go-live. The longest part is usually number porting (5–10 working days). Configuration, testing and training happen in parallel. Connection Technologies manages the entire process, so there is minimal disruption to your operations.