Prepare for the 2027 PSTN and ISDN switch-off
The UK’s legacy PSTN and ISDN phone networks are being switched off by January 2027. Businesses still relying on legacy lines should review their phones, broadband, connectivity, and related services before the deadline becomes urgent.
SNO helps organisations understand what may be affected, assess whether their current connectivity is suitable for VoIP, and plan the move to digital services in a calm, practical way.
Book a 15-Minute Switch-Off ReviewWhy this matters
For many organisations, the switch-off may affect more than phone handsets. Services such as broadband, alarms, lifts, door entry systems, card machines, fax lines, and other systems may still rely on legacy copper lines.
Waiting until the last minute can create unnecessary pressure, rushed supplier decisions, avoidable cost, and operational risk. A short review now can help identify what needs attention and when your current contracts are due for renewal.
Why VoIP depends on connectivity
Moving to VoIP addresses the legacy phone line issue, but call quality and reliability depend heavily on the broadband or dedicated line underneath it.
That is why SNO reviews phones and connectivity together. The aim is not simply to move services across, but to make sure the new setup is suitable for the way the business operates.
Who should book a review
Businesses with
50 to 1000
employees
Organisations with physical offices, depots, warehouses, sites, branches, or customer-facing locations
Companies with heavy phone usage, customer service teams, bookings teams, reception teams, or operations teams
Businesses with contract renewals approaching in the next 3 to 12 months
Organisations unsure whether they still use PSTN or ISDN services
Businesses already on VoIP but unsure whether the connectivity underneath is resilient enough
Understand where you stand before the 2027 switch-off becomes a last-minute issue.
A short review can help identify which services may still rely on legacy lines, whether your connectivity is ready for VoIP, and when action should be planned.
Book a 15-Minute PSTN/ISDN Switch-Off Review