Openreach sets January 31, 2027 for the PSTN switch-off

A facilities estate discovers its alarm lines are on borrowed time

Picture an IT operations lead at a 400-person manufacturer with three sites, a maintenance contract that renews in March, and a fire panel in each building that has dialled out over copper since it was installed. The renewal paperwork mentions nothing about telephony. The letter that matters arrived at the communications provider, not at the manufacturer, and it says the public switched telephone network is switched off on January 31, 2027 with no extensions.

That is the position Openreach has put providers in this week. The infrastructure arm of BT Group circulated a warning to the comms providers that use its network, telling them that any customer still on legacy PSTN connections is at risk of disruption when the service is retired at the end of January 2027. The date has slipped before, after the government asked providers not to force vulnerable customers using phone-network systems such as TeleCare to switch until fixes were in place. This time the message is that it will not slip again.

The estate in question is not a call centre. It is the long tail of equipment that treats a dial tone as a guaranteed utility: point-of-sale terminals, fire and security alarms, personal care alarms for elderly and vulnerable people, and the out-of-band modems that let an engineer reach a router or a switch when the main network is down. None of these appear on a software asset register, which is why they are the ones still connected.

Openreach's own framing is that the easy work is done. James Lilley, the company's Director of All-IP, said the straightforward migrations have largely been completed and what remains are the complex connections that underpin critical operations, requiring careful planning, supplier coordination and thorough testing. For the operations lead above, that translates into three suppliers to chase, three panels to test and one quarter in which to do it.

The deadline is fixed, but the migration path is not one product

The wider programme is a government scheme to move the UK onto all-digital networks running on fibre, and the copper-dependent phone service was standing in the way. For a household that still wants a landline, the changeover means plugging the handset into the back of a broadband router to reach a Digital Voice service. For a business, the equivalent step depends entirely on what the line is attached to.

Openreach has previously told The Register that customers without a fibre connection will likely be moved to SOTAP for Analog, the Single Order Transitional Access Product, where equipment is installed in the local telephone exchange so the old phone line can be used as before. That is a transitional answer rather than a destination, and it is the detail an operations team needs to pin down with its provider before it plans anything else.

The risk is not evenly spread. A fax gateway that sends an occasional purchase order can be replaced by an email workflow in an afternoon. A fire panel that must raise an alarm over a monitored line is a life-safety system with a maintenance contract, a testing regime and an insurer who wants evidence. The same deadline lands on both, but only one of them can be handled by the IT team alone.

That asymmetry is why the deadline matters more than the technology. Openreach has warned that commercial customers who delay migration risk significant disruption and unnecessary costs, and that leaving it until the last minute could make it harder to secure the requisite engineering support before the deadline hits. Engineering capacity, not equipment, is the scarce item in the final quarter.

Waiting is already costing money on the rental line

The financial argument for moving now is already on the invoice. Earlier this year Openreach stepped up its charges to service providers and companies still operating legacy business lines, and those customers will by now be paying double the rental cost compared with last year. The penalty for inaction is not a future risk; it is a line item that has already doubled.

For a finance business partner, that changes the shape of the business case. The migration does not have to justify itself against a hypothetical outage. It has to beat a rental charge that is twice what it was, on a service with a published end date, for equipment that will need replacing anyway. The remaining question is whether the replacement is capital spend this quarter or an operational cost carried by the communications provider.

The less visible cost is the audit itself. Nobody has a complete list of what is still dialling out, because the lines were installed by facilities, by the alarm contractor and by a predecessor in the IT team. Building that list is the first task and it is not free: it means walking sites, reading panel labels and asking each supplier what their equipment expects from the line.

Pescatore's point about public awareness cuts both ways inside a business. The people who know a care alarm or a lift phone exists are not usually the people who read Openreach's letters to communications providers. The operations lead who assumes the provider has told everyone is making the same assumption the provider is making about its customer.

What the shortlist looks like once the audit is done

Once the estate is listed, the decision reduces to a small number of options per line, and the choice is driven by what the equipment can accept rather than by price. A router-based digital voice service, a transitional exchange-based product, a mobile or IP replacement for the alarm path, or a managed service from the communications provider that takes the whole problem off the internal team.

The table below is the shortlist an operations lead ends up with after the audit, and the columns that decide it. Prices are not published in the material Openreach has circulated, so the honest entry for cost is to ask the provider for a per-line figure and a termination position on the existing contract.

The one option that should not survive the shortlist is doing nothing and hoping for an extension. Openreach has pushed the date back at least once, but the current letter states plainly that the deadline will not be postponed, and the doubled rental charge applies in the meantime.

The sequence that gets a business to January with the alarms still working

The order of work matters more than the choice of product, because the long-lead items are the ones attached to life-safety and payment systems. Start with the audit, then the suppliers, then the testing, and leave the plain voice lines until last because they are the easiest to move and the least damaging to get wrong.

Openreach's own advice to consumers is to call their service provider as soon as possible to ensure service is not interrupted, and its advice to businesses is to audit remaining analog services and work with their communications provider on a migration plan today. That is the whole checklist in two sentences, but the internal work behind it is what takes the quarter.

The checklist below is the one to hand to the operations lead, in the order it should be worked. Each step produces something the next step needs, and the testing step is the one that most often slips because it depends on a contractor being on site.

The final item is the one that decides whether the migration was a success or a near miss. A line that has been replaced but never tested under alarm conditions is not migrated; it is merely disconnected from the old network and waiting to fail on the day it is needed.

The checklist to hand over this quarter

First, list every line and what it feeds: handsets, point-of-sale terminals, fire and security alarms, personal care alarms, lift phones and out-of-band admin modems. Second, ask each equipment supplier in writing whether their device works over a router-based digital voice service, over SOTAP, or only over a mobile or IP path, and get the answer before choosing a product.

Third, take the list to the communications provider and ask for a per-line price, a contract term and a written position on what happens when the transitional product ends. Fourth, book the engineering resource now, because Openreach has warned that last-minute demand makes support harder to secure. Fifth, test every migrated line end to end with the monitoring centre or the alarm receiving centre on the call, and record the result.

Sixth, keep the old line live until the test passes, then cancel it and confirm the rental charge has stopped. The doubled rental is the reminder that the old estate is still being paid for, and the January 31, 2027 date is the reminder that it will not be paid for indefinitely.

What the deadline actually asks of an IT team

The PSTN switch-off is not an IT project in the usual sense. It is an inventory problem followed by a supplier coordination problem, and the technology is the easy part. The businesses that come through it cleanly will be the ones that treated the audit as the deliverable and started it this quarter rather than next.

Openreach's letter to providers is a warning aimed at them, but the operational consequence lands on the customer's estate. The date is fixed, the rental has doubled, and the remaining connections are the complex ones. That is enough to justify the audit before the next contract renewal, whatever the provider says about extensions.

The decision rule for the operations lead

If the estate has any life-safety or payment line on copper, the audit starts this month and the provider conversation starts the week after. If the estate is plain voice only, the router-based digital voice path is the default and the work is scheduling rather than engineering. In both cases the test record is the artefact that proves the migration happened, and it is the thing to keep when the auditor or the insurer asks.

Where the risk sits in the final quarter

The risk is not that the network fails on February 1. It is that the engineering capacity to move a fire panel is booked out by December, and the business that started in January is competing with everyone else who waited. Openreach has said the straightforward migrations are largely complete. The queue that remains is the one nobody wanted to join.

What to ask the provider before signing

Ask what product replaces the line, what it costs per line, what the term is, and what happens at the end of any transitional arrangement. Ask for the answer in writing, because the person who answers the phone today may not be the person answering it in January. Then test the line before the old one is cancelled.

The number to carry into the renewal

The number is January 31, 2027, and the second number is double last year's rental on every legacy business line still in service. Those two figures are enough to move the migration from a future project to this quarter's work, and they are the ones to repeat in the vendor call.