The PSTN Switch Off is coming — but not as soon as we thought!
BT Openreach has officially pushed back the final switch-off date for the PSTN (public switched telephone network) from 31 December 2025 to 31 January 2027. While this gives businesses a little more breathing room, it shouldn’t mean delaying your migration plans.
If you’re an established SME relying on legacy systems, here’s what you need to know—and do—to prepare for a future without the PSTN.
What is the PSTN and Why is it Being Switched Off?
The PSTN or public switched telephone network has powered voice communication across the UK for over a century. It includes analogue landlines and ISDN services, all running over copper infrastructure.
But maintaining PSTN technology is increasingly unsustainable and incompatible with modern digital services. That’s why Openreach is transitioning the UK to a full fibre and all-IP network.
From January 2027, services running on PSTN—including broadband, telephony, alarms, fax machines, EPOS systems, and lift lines—will no longer function unless migrated to IP-based alternatives.
Tip 1: Audit All PSTN-Dependent Services
Many businesses are unaware of how deeply embedded the PSTN is in their operations. Don’t just think about your phone lines — look for PSTN reliance in:
- Business broadband connections
- Security and fire alarm systems
- Door entry and lift emergency lines
- Payment terminals (e.g., chip & pin machines)
- Fax or telemetry services
Action: Create a full inventory to understand the scope of your dependencies.
Tip 2: Migrate to VoIP and Digital Voice Services
Voice over IP (VoIP) is the leading replacement for PSTN-based phone lines. It’s more flexible, scalable, and cost-effective—especially for SMEs.
Your options include:
- Hosted VoIP systems: Ideal for multi-site businesses or remote work
- SIP trunks: Suitable for companies with existing PBX systems
- Digital voice services: Basic landline replacement for smaller teams
Bonus: Many VoIP solutions integrate with CRM, helpdesks, and collaboration tools to improve productivity.
Tip 3: Start Your Migration Well Before 2027
Just because the switch-off date is now January 2027, doesn’t mean you should wait.
- Network and service providers will begin phasing out PSTN infrastructure across the UK earlier
- Stock shortages and engineer availability could delay migrations
- Last-minute transitions increase the risk of downtime or disruption
Action: Set a target date for your switch in 2025 or 2026 to stay ahead.
Tip 4: Train Your Teams on New Technology
Modern phone systems come with advanced features—call routing, mobile apps, video conferencing, and more.
Provide training to ensure your teams can:
- Use new systems confidently
- Access tools remotely or from hybrid setups
- Maintain customer service standards during the transition
Pro tip: Select a provider, like Daisy, who offer onboarding and ongoing support.
Tip 5: Don’t Overlook Compliance, Security & Business Continuity
When leaving PSTN behind, don’t just think about features—think about resilience.
- Ensure new systems meet GDPR and PCI DSS requirements
- Ask about data backups and call recording policies
- Implement VoIP security best practices (e.g., firewalls, call encryption)
Redundancy is key: Ensure failover routing and uninterrupted service during outages.
Tip 6: Use the PSTN Switch Off as a Strategic Opportunity
Migrating from the pstn public switched telephone network isn’t just about survival—it’s an opportunity to modernise.
- Reduce overheads
- Improve remote work readiness
- Unlock better collaboration tools
- Boost scalability and customer responsiveness
Ready to Futureproof Your Business Comms?
The PSTN Switch Off may have been delayed, but smart SMEs are acting now. Futureproof your operations, simplify your systems, and stay competitive in a digital-first world.
Book your free PSTN readiness audit today and explore VoIP options tailored for your SME.