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11 Mar, 2026
Business VoIP & Phone Systems for UK Small Businesses
Cloud-Hosted Telephony, SIP Trunking & Microsoft Teams Voice
Hosted VoIP
Cloud-based business phone systems with advanced call routing, voicemail, auto-attendant and CRM integration. No hardware on-site, no maintenance headaches.
Microsoft Teams Voice
Make and receive external calls directly from Microsoft Teams. One platform for chat, video, meetings and phone calls — fully integrated with your existing Microsoft 365.
SIP Trunking
Connect your existing PBX to the internet for lower call costs and built-in disaster recovery. Keep your hardware investment while gaining modern flexibility.
Traditional phone lines are expensive, inflexible and holding your business back. A cloud phone system replaces them with modern IP telephony UK businesses can rely on — one that costs less and does more.
As a specialist VoIP provider UK companies trust, we deliver hosted VoIP phone systems, Microsoft Teams Voice integration and SIP trunking through our partnership with Fidelity Group. We handle everything — from choosing the right business phone system UK teams need and configuring your handsets through to VoIP number porting, CRM integration and ongoing support. You get enterprise-grade telephony without the enterprise complexity.
Hosted VoIP Phone Systems
Three routes to modern business telephony — including VoIP for small business UK companies of every size. We recommend the right one based on how your team actually works, not what generates the biggest commission.
Cloud Hosted
Hosted VoIP
Full cloud phone system
A complete VoIP phone system hosted in the cloud — no cloud-hosted PBX hardware on your premises. Calls route through secure data centres with automatic failover, giving you enterprise-grade reliability with zero maintenance. Scales from 2 users to 2,000.
- Auto-attendant, hunt groups & call queues
- Voicemail to email, call recording & analytics
- 200+ CRM integrations (Salesforce, HubSpot, etc.)
- Softphone app for mobile & desktop
Most Popular
Microsoft Teams Voice
Calling inside Teams
Already using Microsoft Teams for chat and meetings? Add external calling directly inside Teams for true unified communications UK businesses need — one app for everything. Your team makes and receives calls from their existing Teams interface on desktop, mobile or IP handsets. No separate phone system needed.
- External calls directly from Microsoft Teams
- 2,000 UK landline & mobile minutes included
- Single app — chat, video, meetings & phone
- Works on desktop, mobile & IP handsets
Keep Your PBX
SIP Trunking
IP connectivity for existing PBX
Already have a PBX you're happy with? SIP trunking connects it to the internet instead of traditional ISDN lines — the ideal ISDN to VoIP migration path for businesses that want to keep their existing investment while modernising the connection with lower costs and flexible call routing.
- Lower call costs than ISDN
- Built-in disaster recovery & call rerouting
- Keep your existing PBX hardware
- PSTN switch off 2027 ready
Delivered in partnership with Fidelity Group
We've partnered with Fidelity Group — an award-winning hosted VoIP UK provider — to deliver enterprise-grade business VoIP solutions to companies of all sizes. Their Horizon hosted telephony platform and our IT expertise means you get a phone system that's properly configured, integrated and supported.
Fraud Protection
Lifetime Warranty
24/7/365 Support
Our approach to business VoIP
Understand How You Work
We don't sell phone systems — we solve communication problems. We start by understanding how your team actually works: who calls whom, how calls should be routed when VoIP for office and remote staff needs differ, what happens when someone's unavailable, and what integrations matter. Then we recommend the right solution.
Configure It Properly
A VoIP system is only as good as its setup. We configure every VoIP feature — call flows, auto-attendants, hunt groups, voicemail routing and user permissions — properly from day one. We handle VoIP number porting, set up handsets and test everything end-to-end before go-live.
Support It Like IT
Unlike a telecoms company that disappears after installation, we're an IT company. Your phone system integrates with your network, your internet connection and your business applications — and we support all of it together, not in silos.
How it works
From first conversation to live phone system, we manage the entire process so the switch is seamless for your team.
1
Discovery & Recommendation
We assess your current phone setup, call volumes, team structure and remote working requirements. We check your broadband is suitable for VoIP and recommend the right system — hosted VoIP, Teams Voice or SIP trunking.
2
Configuration & Number Porting
We configure your entire phone system — call flows, auto-attendant menus, hunt groups, voicemail, user permissions and CRM integrations. We port your existing numbers so customers call the same number as before.
3
Handset Setup & Training
We pre-configure IP handsets, install softphone apps on laptops and mobiles, and provide hands-on training for your team. Everyone knows how to use the new system before we switch it on.
4
Go-Live & Ongoing Support
We manage the cutover to minimise disruption, monitor the system post-launch and provide ongoing technical support. Need a new user added, a call flow changed or a handset replaced? One call to us.
Businesses turn to us when
Their traditional phone system is unreliable, expensive to maintain and can't support remote or hybrid workers
They're paying too much for ISDN lines and call charges when switching to VoIP would slash their bills to a fraction of the price
The PSTN switch off 2027 deadline is approaching and they need an ISDN to VoIP migration plan before traditional lines are disconnected
They want to use Microsoft Teams for calling but don't know how to set up Teams Voice with external numbers
Their business has grown or added offices and their phone system can't scale without expensive hardware upgrades
They need their phone system integrated with their CRM so calls are logged automatically and customer data pops on screen
They're moving office and want a phone system that moves with them — without engineers and rewiring
Their current provider takes days to add a new user or change a call route — they need a system that's instant and flexible
They want call recording, analytics and reporting but their current phone system doesn't support any of it
Microsoft Teams Voice
We're not a telecoms reseller that sells you a system and disappears. We're an IT company that understands how your VoIP phone system fits into your wider technology stack — your network, your internet connection, your Microsoft 365 environment and your CRM.
When we set up your VoIP system, we're thinking about call quality (is your broadband fast enough?), security (is your firewall configured for SIP trunking traffic?), integration (does it connect to your CRM?) and user experience (can your team actually use it?). Most telecoms providers don't think about any of that.
Through our partnership with Fidelity Group, you get access to the Horizon hosted telephony platform — one of the UK's most reliable and feature-rich IP telephony UK platforms. But unlike going direct, you also get our IT expertise layered on top — proper network configuration, QoS settings, firewall rules and integrated support.
Whether you need a straightforward hosted VoIP UK system for a small team or a full Microsoft Teams Voice deployment across multiple offices, we'll design the right solution, manage the migration and keep everything running.
Why Cloudswitched for VoIP?
IT company first, telecoms provider second. That's why your phone system actually integrates with everything else.
IT company, not a telecoms reseller
We configure QoS, firewalls, VLANs and network settings properly — not just plug in phones and hope for the best. Your voice quality is our responsibility.
One point of contact
Phone system, internet connection and IT support — all managed by one team. No finger-pointing between providers when something goes wrong.
CRM integration done right
We don't just tick a box — we properly integrate your phone system with your CRM so screen pops, call logging and click-to-dial actually work reliably.
Right system, not the most expensive
If Microsoft Teams Voice is all you need, we won't upsell you a full cloud-hosted PBX. We recommend based on what fits your business, not our margin.
Network-first approach
We assess your broadband, configure QoS and test call quality before go-live. If your connection isn't good enough for VoIP, we'll fix that first — we do connectivity too.
Fraud protection included
VoIP fraud is real — hackers can run up thousands in international call charges overnight. Our systems include fraud detection and call barring to protect your business.
Seamless number porting
We manage the entire porting process — coordinating with carriers, scheduling the switchover and ensuring zero downtime. Your customers won't notice a thing.
Hybrid & remote ready
Softphone apps on every device mean your team can make and receive calls from their business number whether they're in the office, at home or on the road.
Scales instantly
Adding a new user takes minutes, not weeks. No engineer visits, no hardware orders, no waiting. Your phone system grows as fast as your business does.
SIP Trunking Solutions
With the UK PSTN shutting down in January 2027, every business needs an internet-based phone system. Here's what you need to know.
PSTN Switch-Off 2027 — What It Means for Your Business
The UK's traditional telephone network (PSTN) is being permanently switched off in January 2027. BT has already stopped selling new ISDN lines, and existing lines are being disconnected area by area. Every UK business still using traditional phone lines will need to migrate to a cloud phone system or VoIP solution before the deadline. If you haven't started planning your migration yet, now is the time — we can assess your current setup and recommend the right replacement.
Unified Communications & Microsoft Teams Calling
Modern businesses need more than just a phone system — they need unified communications UK organisations depend on (UCaaS) that brings voice, video, messaging and collaboration into a single platform. Microsoft Teams Voice (also known as Teams Phone) lets your team make and receive external calls directly from the Teams app they already use every day. It's the most seamless way to consolidate your communication tools, achieve significant VoIP cost savings and support VoIP for office-based and remote workers who need to stay connected from any location.
VoIP Pricing & Cost Per User
Understanding VoIP system cost UK businesses face is straightforward — typically 30-50% cheaper than traditional phone systems. Hosted VoIP costs around £8-£15 per user per month, with Microsoft Teams Voice at a similar price point. VoIP cost per user includes call bundles, voicemail, auto-attendant and mobile apps — VoIP features that would cost thousands extra on a legacy PBX. We provide clear, itemised quotes so you know exactly what you're paying before you commit.
Frequently Asked Questions
Common questions about business VoIP and hosted telephony. If you need more detail, get in touch — we're happy to talk it through.
What is VoIP for small business UK companies and how does it work?
VoIP (Voice over Internet Protocol) replaces traditional phone lines by routing calls over your internet connection. For UK small businesses it means lower call costs, flexible remote working and enterprise-grade features like auto-attendant, call queues and CRM integration — without expensive on-site hardware. All you need is a reliable broadband connection.
How much does a VoIP system cost UK businesses per month?
A hosted VoIP system typically costs £8–£15 per user per month, depending on the features and call bundles you choose. Microsoft Teams Voice is priced similarly. Most UK businesses achieve 30–50% savings compared to traditional ISDN lines, and there are no upfront capital costs for hardware. We provide a clear, itemised quote based on your user count.
What is the PSTN switch off 2027 UK and how does it affect my business?
BT and other UK carriers are switching off the Public Switched Telephone Network (PSTN) and all ISDN services by January 2027. After that date, traditional analogue and ISDN lines will stop working entirely. Every UK business still using legacy phone lines needs to migrate to a VoIP or SIP-based solution before the deadline. We handle the entire transition so there is zero downtime.
How does Microsoft Teams Voice integration replace a separate phone system?
Microsoft Teams Voice integration adds full external calling capability directly inside the Teams app your staff already use for chat and video meetings. You make and receive calls from desk phones, mobiles or laptops — all through one interface. It eliminates the need for a separate PBX or hosted phone platform and simplifies management into a single unified communications tool.
What are SIP trunking solutions UK businesses use to cut call costs?
SIP trunking connects your existing on-premise PBX to the internet instead of traditional ISDN lines. UK businesses use SIP trunks to reduce call charges by up to 50%, add built-in disaster recovery and scale capacity on demand without installing new physical lines. It is ideal if you want to keep your current PBX hardware while gaining modern flexibility and lower costs.
How does ISDN to VoIP migration UK work and how long does it take?
We audit your current ISDN lines, map your call flows and design a hosted VoIP or SIP trunking replacement. The migration itself typically takes 2–4 weeks including VoIP number porting, handset provisioning and network configuration. We run the old and new systems in parallel during cutover so your business experiences zero downtime. The entire project is managed end-to-end by our team.
What is a cloud-hosted PBX and do I still need hardware on-site?
A cloud-hosted PBX is a telephone exchange hosted in a secure data centre rather than a physical box in your office. All call routing, voicemail, auto-attendant and recording features run in the cloud. You do not need any PBX hardware on-site — just IP handsets or softphone apps on your computers and mobiles. Maintenance, updates and disaster recovery are all handled by the provider.
How does VoIP number porting work and can I keep all my existing numbers?
VoIP number porting transfers your existing phone numbers from your current provider to the new hosted VoIP or SIP platform. We submit porting requests on your behalf, coordinate with the losing carrier and schedule the switch so there is no gap in service. The process typically takes 1–2 weeks for standard UK geographic and non-geographic numbers. You keep every number — nothing changes for your customers.
Get a free VoIP consultation
Tell us about your current phone setup and we'll recommend the right solution — no obligation, no pressure. We'll assess your network, map your call flows and give you a clear, honest quote.
Upgrade your business phones
Whether you need a hosted VoIP system, Microsoft Teams Voice or SIP trunking for your existing PBX, our team is ready to design the right solution and manage the entire migration for you.
Submit your details and one of our friendly team members will be in touch with you shortly