The countdown has officially begun… again.
Yes, BT’s long-anticipated switch-off of the UK’s traditional ISDN and PSTN networks has now been rescheduled for January 2027.
After earlier delays, the final phase-out is firmly back on the roadmap, and it’s a critical change that UK businesses can’t afford to ignore.
☎️ What’s Happening?
BT is retiring its WLR (Wholesale Line Rental) services, including ISDN2, ISDN30, and traditional analogue phone lines. From January 2027, these legacy systems will no longer function—affecting both voice calls and any services relying on analogue lines (like fax machines, alarms, and payment terminals).
💡 Why It Matters to Your Business
If your business is still using ISDN, you’re running on infrastructure that’s outdated, costly, and inflexible. The switch-off forces a change—but it also opens the door to better communication systems:
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Improved reliability and voice quality
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Reduced monthly costs
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Scalability for hybrid workforces
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Integration with modern platforms like Microsoft Teams
🔁 Your Options
At IntraLAN, we help businesses choose the right-fit solution based on their current infrastructure and future needs:
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SIP Trunks: Ideal for businesses with existing phone systems that support IP telephony. SIP runs over your internet connection and reduces the need for multiple physical lines.
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Hosted Telephony / VoIP: Cloud-based systems offer flexibility, scalability, and advanced features—without the maintenance of on-site equipment.
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Unified Communications: Combine voice, video, chat, and collaboration in one streamlined platform. We offer hybrid, cloud, and even Microsoft Teams-integrated voice services.
If your current phone system isn’t compatible with modern solutions, we can advise on:
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On-premise upgrades
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Hybrid systems
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Full cloud migrations
🔍 Not Sure What You’re Using?
If you’re unsure whether your business is still using ISDN or how the switch-off will affect you, our team can help. We’ll perform a quick assessment and talk you through your options—no jargon, no pressure.
📞 What Happens Next?
One of our Sales Engineers will be reaching out to discuss your specific setup and suitable upgrade paths. But if you’d prefer to speak with someone sooner, don’t wait—contact us today and we’ll help you get ahead of the switch-off.
Let’s Make the Move Simple
At IntraLAN, we’ve been helping businesses modernise their voice infrastructure for years. With our guidance, you’ll get a future-proof solution that matches your business goals, budget, and connectivity.
✅ No disruption
✅ Business-grade performance
✅ UK-based support
