The clock is ticking – how ready is your business for the ISDN & PSTN switch-off?
All PSTN and ISDN networks will be closed by 2025, transitioning all UK businesses to all-VoIP networks to mitigate the rising costs of maintaining legacy equipment. According to managed services provider Espria, millions of UK businesses are expected to be impacted, especially those who still rely on fax machines and landlines.
Andy Fung, Solutions Architect, Espria, stated, “Businesses need to address this issue now and avoid sticking their heads in the sand. It is going to happen whether they are ready or not. Decision makers should not wait until 2025, as exchanges are being phased out now.”
BT Openreach announced back in November 2017 its intention to switch off analogue and ISDN lines in 2025, affecting PSTN-based services and some broadband services. BT Openreach’s logic was based on the fact that since ISDN’s (Integrated service digital network) first iteration in the 1990’s, digital demands on networks for organisations and homes have changed dramatically, and the underlying technology needs to reflect and support modern requirements.
A rapid audit of your network is recommended to understand how many connections you have, of what type and what they are being used for. Leaving it to the last minute could result in increased installation costs and delays. Depending on the nature of your organisation, these could be anything from simple voice lines to DSL broadband, building alarm circuits or even all external connectivity to the telephony system in use.

“Organisations can get prepared for the 2025 switch-off because BT Openreach is taking a phased stop sell approach at individual city locations taking place between December 2020 to August 2023. When a location has met its stop sell deadline, then analogue and ISDN lines cannot be purchased or have additional features or changes made to existing service,” continued Fung.
“If your organisation is using analogue phone lines, ISDN or broadband services running over analogue lines, at the end of December 2025 these will be switched off and become end of life.”
These include:
- Analogue phone lines (including dial up devices, fax, modem, and PDQ machines)
- ISDN (ISDN2 and ISND30)
- Some broadband services (ADSL, Max, 2+ and FTTC circuits)
“If you’re still in contract with a line that is coming to end of life, like ISDN and PSTN, you need to start looking at your current technology ecosystem and get prepared”, continued Fung.
Espria has recommended the following tips:
- If you’re renewing contracts, look to move to a future-proofed solution
- When you’re opening a new site location, consider IP based connectivity options
- Assess your existing telephony options, if you’re using an on-site PBX with analogue or digital inbound/outbound lines review the marketplace for suitable VoIP (Voice over Internet Protocol) options including IP telephony and Microsoft Teams.
“However, this also presents an opportunity for organisations to reassess their business communications as a whole. Implementing cloud phones as part of a wider unified communications plan allows an organisation to overhaul outdated communications infrastructure and save costs with comprehensive and targeted change.
“This is best completed and managed with the assistance of industry experts able to bring together phone lines, video calls, email, chat tools, file sharing and more. With the right assistance, you can improve your company’s communications, save money and seamlessly integrate all aspects of communications and connectivity,” concluded Fung.
You may be interested in
Taking Control of Print Costs Without Micromanaging Staff
The Hidden Cost of Office Printing Print costs have a habit of creeping up quietly: a few extra colour pages here, an unnecessary duplicate print there, a job sent to the wrong printer and reprinted. On their own, none of these feel significant. Across a whole office, over a year, they add up to a real and often invisible cost. See where your print spend is going PaperCut gives an Office Manager visibility and control over this without needing to police individual print jobs. In practice, this looks like: Reduce waste without restricting staff The…
Five Printer Security Risks Most Small Offices Never Think About
5 Print Security Risks Hiding in Your Office Following on from our earlier piece on printers as network endpoints, it is worth being specific about what actually goes wrong. These are the five risks we see most often when we assess a print fleet for the first time. The five print security risks to look out for 1. Default or shared admin passwords. Many devices are still running the password they arrived with, often known publicly for that model. 2. Unsecured print queues. Documents sitting in a print queue, or printed and left uncollected in…
From AI Experimentation to Real Business Outcomes: Our Takeaways from Microsoft Frontier Tour London
This week, Pete Graham, Microsoft Business Manager at Espria, attended Microsoft Frontier Tour London alongside members of the wider Espria team to hear directly from Microsoft leaders, partners and customers about the future of artificial intelligence. Having attended Microsoft’s AI Tour last year, Pete was interested to see how the conversation had evolved over the past 12 months. What became clear throughout the day was that the discussion around AI has matured significantly. A year ago, many organisations were still asking what AI could do. Today, the focus is increasingly on how to adopt it…
Critical PHP vulnerabilities: do you know who owns the fix?
When websites and applications sit with different teams and suppliers, the first challenge is knowing who needs to act. Critical vulnerabilities have been disclosed affecting PHP, a technology widely used across websites, web applications and other software products. The technical advice is clear: identify affected systems and apply the available updates. But for many organisations, the first challenge is understanding where PHP is being used, who manages those systems and who is responsible for taking action. To help you identify potential exposure, we have created a PHP Security Checker to determine whether your systems have…
Beyond the Filing Cabinet: What Document Management Actually Saves You
Document Management for Small Offices with DocuWare For many small offices, document management still means a filing cabinet, a shared drive with inconsistent folder names, and a lot of time spent searching for the one contract or invoice somebody needs right now. DocuWare replaces that with a structured, searchable system that sits behind your everyday paperwork. What does DocuWare mean in practice? Giving Office Managers time back For an Office Manager who is often the person holding the whole administrative process together, this is time back. Fewer interruptions to find a document for a colleague,…
Copilot vs. Claude
Why Microsoft 365 Copilot fits every day work A plain-English guide for people trying AI at work: what Copilot does, how it differs from a separate assistant such as Claude and where to start. The short answer Claude is a separate AI workspace. Copilot sits inside the Microsoft apps many teams already use and can work with the emails, files and meetings each person is allowed to access. A separate assistant helps when: Copilot helps when: – You need help creating or developing content from scratch. – The task is focused research, reasoning or code….





