Openreach is warning UK businesses and Communications Service Providers (CSPs) to accelerate their move to digital networks, with just 18 months remaining until the Public Switched Telephone Network (PSTN) is officially decommissioned in January 2027.
The nationwide transition to All-IP networks marks the end of legacy PSTN infrastructure, affecting everything from landline phones and ISDN systems to payment terminals and security alarms.
Businesses that fail to migrate risk service outages, operational disruption, and financial losses.
“The digital world won’t wait for those that stall,” said James Lilley, director of All IP at Openreach.
“The nationwide transition to an All-IP network is a huge undertaking. Now that we’ve addressed the needs of vulnerable users, it’s time for all businesses to act and unchain their networks from outdated infrastructure.”
To support the transition, Openreach has outlined a simple three-step process: Review, Test, and Switch. Businesses are encouraged to audit their current systems to identify any PSTN-reliant equipment, conduct free compatibility tests at Openreach labs, and implement digital alternatives as soon as possible.
While the national switch-off date is set for January 2027, some CSPs have announced earlier deadlines, including as soon as December 2025. Delaying action could mean increased costs, exposure to cyber threats, and missed opportunities in adopting next-gen communication technologies.
This push comes as part of Openreach’s broader £15 billion investment in full fibre broadband, aiming to reach 25 million premises by the end of 2026. So far, 18 million locations have already been connected, with thousands more added weekly.
“Businesses must embrace the digital future or risk falling behind,” Lilley added. “Switching now will help secure continuity, unlock growth, and prepare for the next generation of connectivity.”
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