Moving from landlines to VoIP — properly.
BT is switching off ISDN in 2027 — every UK business on the old copper network has to move. Done properly, VoIP is genuinely better than what it replaces. Done badly, it sounds terrible. We do it properly.
What we hear every week.
The frustrations behind why businesses search for moving from landlines to voip in the first place. If any of these feel familiar, the fix is straightforward.
2027 deadline approaching
BT is switching off the PSTN/ISDN copper network by January 2027. Every UK business still on a traditional landline has to migrate before then.
Bad VoIP sounds terrible
VoIP done over inadequate broadband, with no QoS, on consumer-grade kit, sounds awful. Most 'VoIP doesn't work' stories are actually 'VoIP installed badly' stories.
Fear of losing business numbers
Established UK businesses worry about losing phone numbers their customers have used for years. Number porting handles this — your numbers move with you.
Migration projects fail without planning
Migrations done by box-shifters who drop in a router and a handset typically fail. Done properly with broadband audit, QoS, kit specification and parallel-running cutover, they go smoothly.
Migration done properly, not done cheaply
A proper landline-to-VoIP migration starts with a broadband audit — is your current broadband adequate for VoIP, or does it need upgrading? Then QoS configuration so voice traffic is prioritised. Then kit specification: business-grade IP phones or softphones, not consumer Wi-Fi calling. Then number porting, planned in parallel with kit install. Then a cutover window where the old line stays live until the new platform is tested. Then training, support, and a named UK account manager. That's the difference between migrations that go smoothly and migrations that destroy your call quality for six months.
The Telexico approach to moving from landlines to voip.
Six things our customers consistently tell us matter.
Broadband audit first
We assess whether your current broadband can support VoIP — and upgrade it if not. We won't sell you VoIP that will sound bad.
QoS configured properly
Voice traffic prioritised on your network so video conferencing and big downloads don't degrade call quality.
Number porting included
Keep every existing UK business number. Customers see no difference; advertising and stationery unchanged.
Business-grade kit
Yealink, Polycom, Cisco IP phones — properly configured, plug-and-play install.
Parallel cutover
Old line stays live until the new platform is tested and signed off. Downtime measured in minutes, not days.
UK install and support
Wolverhampton-based engineers for install, configuration and ongoing support — not an offshore queue.
Built for the migration, not just the sale
Plenty of providers will quote VoIP and ship kit. The migration phase — broadband audit, QoS, number porting, training, cutover, parallel-running — is where things actually go wrong. We're set up to do migrations properly because we own broadband, voice, kit and support all in one business. Anyone selling VoIP without owning the underlying broadband is by definition limited in what they can audit or fix.
How it works for businesses like yours.
Three real-world setups we deliver across the UK.
UK businesses on ISDN approaching switch-off
Multi-line ISDN, PSTN copper, traditional PBX — all needing to migrate before January 2027 regardless.
Multi-site businesses with separate phone systems
Each site on a separate landline contract today; one cloud VoIP platform after migration with free internal calls between sites.
Businesses outgrowing their existing PBX
Old PBX in the corner, no app for mobile, no integration with CRM, no analytics. VoIP migration is the obvious moment to upgrade rather than just replace like-for-like.
Why UK businesses pick Telexico for VoIP migration
We own the broadband, the voice platform, the kit, the install team and the support. Migrations done by box-shifters fail because they touch only one part of the stack. Migrations done by Telexico work because we plan and execute across the whole stack — audit, upgrade, port, install, train, support — without handoffs between vendors.
What you actually get from Telexico.
Honest about scope. No aggressive sales tactics, no surprise renewal jumps, no tier-1 call-centre triage. Real UK engineers, transparent pricing, one provider relationship across the stack.
UK-based provider
Wolverhampton-headquartered. Engineers cover the West Midlands daily; UK-wide install via our partner network. Real UK engineer support, UK data residency, UK contractual relationship — not US-routed SaaS.
Real engineer support
When you call Telexico, you reach someone who can actually fix things. Response SLA backed by real engineering capacity rather than call-centre headcount. Named account manager for ongoing customers.
Free infrastructure review
Every engagement starts with a no-obligation audit of your current setup. Honest recommendation — sometimes that's "stay with your current provider after negotiation." We'd rather be honest than oversell.
Transparent pricing
What you sign for is what you pay — including renewal. No teaser pricing that jumps 30-100% at year two. No mid-contract CPI shock. Predictable multi-year cost from day one.
One provider, one platform
Broadband, hosted VoIP, business WiFi, AI Receptionist, 4G/5G failover, CCTV consolidated onto one Telexico relationship. Single bill, single support number, single engineer when something needs attention.
Migration project-managed
Switching to Telexico isn't DIY. We handle contract audit, notice timing, ordering, parallel running, cutover, old-provider close-out. Customer-visible disruption typically measured in minutes.
Tailored around your business.
Tell us what you have now and what's frustrating you. We'll come back with a tailored review of where we can simplify, consolidate or improve it — no fixed-package pressure, no hard sell.
You may also want to read
What is Starlink for business
Starlink Business is SpaceX's commercial-grade satellite internet service for businesses. It uses a constellation of...
Leased line vs full fibre
Full fibre (FTTP) and leased lines are both fibre-optic business connectivity, but they're fundamentally different...
Openreach vs CityFibre
Most UK business broadband is delivered over one of two main fibre networks: Openreach (BT-owned, the incumbent, covers...
Business Broadband cost
Indicative UK pricing for business broadband — what affects the price, ranges, and a free tailored review.
Leased Lines cost
Indicative UK pricing for leased lines — what affects the price, ranges, and a free tailored review.
Free infrastructure review
Send us your current setup. We'll review what you have, what you pay, and where we can simplify.
Frequently asked questions
When does ISDN actually switch off?
BT's target is January 2027 for full PSTN and ISDN switch-off in the UK. Some regional switch-offs are running earlier as test markets. Either way, every UK business on traditional copper has to migrate by then or lose phone service entirely.
What if my broadband isn't fast enough for VoIP?
We audit it and upgrade if needed. The honest answer is most UK business broadband connections will support a small to mid-sized VoIP install (5-30 users) provided QoS is configured. Larger installs may need broadband upgrade. We'll tell you what your specific setup needs.
Can I keep my existing phone numbers?
Yes — UK number portability is a regulated process. Your existing landline numbers port to the Telexico cloud platform; customers see no difference; existing advertising and stationery unchanged.
Will my old phones still work?
Probably not without conversion. Old analogue phones plug into analogue lines; VoIP uses IP handsets or softphone apps. We typically supply new IP handsets as part of the migration (Yealink, Polycom, Cisco). Some legacy phones can be adapted via ATA boxes if there's a specific reason to keep them.
What about my fax machine and PDQ card terminal?
Fax: most VoIP platforms support fax over IP, or migrate fax-to-email; we'll design around your specific needs. Card terminals: most modern PDQs are IP-based already; older serial-line terminals may need adapters or replacement. We audit these during pre-sales.
How long does the migration take?
Typically 4-8 weeks end-to-end. Number porting is the longest item (2-4 weeks within the window). Broadband upgrade (if needed) runs in parallel; kit install and configuration in the final week before cutover; parallel-running during the cutover itself.
What if I have a complex existing PBX setup?
We design around it. Complex setups — multi-site PBXs, hospitality systems, contact centres, hybrid Teams integrations — are routine work. We map current features, ensure parity on the new platform, and improve where the new platform offers more.
Apply this to your business?
Reading the guide is one thing; applying it to your specific operation is another. Send us your current setup — we'll review what you have, what fits, and where to start. No hard sell, no fixed-package pressure.