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The Public Switched Telephone Network (PSTN) has been in use in this country since 1876, so it’s understandably grown old and tired, and it’s becoming increasingly costly to maintain. Therefore, it needs replacing with new and modern technology, fit for the digital world we now live in.

The PSTN is simply the copper wires we currently use to make and receive telephone calls but, with technology moving forward at a rapid rate, it’s no longer necessary, or as effective, to make calls using the old, degrading system.

Instead, it’s cost-effective and more reliable to use alternative methods such as a Voice over Internet Protocol (VoIP) solution or a SIP Trunking product.

As a result, the PSTN will reach end of life in December 2025 and will cease operation after then. At the end of December 2025, these fixed lines and services will be switched off and services withdrawn. If any businesses or consumers have failed to switch to alternative telephony, they will ultimately be left without service.

Here at Daisy, we are proactively contacting customers ahead of the switch off to ensure that you are well prepared with new services and technology in order to remain unaffected. 

What do you need to do?

We’re one of only a handful of providers that are actively involved in industry planning meetings regarding the PSTN switch-off so, don’t worry, we’ll keep you in the loop.

If you’re currently on an ISDN contract, you don’t need to do anything at the moment. But, be mindful that when your contract is up for renewal, you’ll probably need to switch to a hosted telephony solution.

In Salisbury and Mildenhall, there’s already activity, and Openreach has begun withdrawing services with a view to switching off the PSTN in these areas by December 2022. Replacement products will be launched early in these areas to ensure that everyone is well prepared. If your business is located in Salisbury or Mildenhall, we’ll be in touch!

For everyone else outside these areas, there’ll be no new installations on the PSTN network from 2023 and, in 2025 it’ll all be switched off.

What are the dates?

, PSTN & ISDN Switch Off

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The Big 2025 Switch Off

An Essential Guide to ISDN and PSTN Switch Off

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Frequently Asked Questions

The Public Switched Telephone Network (PSTN) has been in use in this country since 1876, so it’s understandably grown old and tired, and it’s becoming increasingly costly to maintain. Therefore, it needs replacing with new and modern technology, fit for the digital world we now live in.

As a result, the PSTN will reach end of life in December 2025 and will cease operation after then. However, the PSTN supports several products from Openreach which are sold to businesses including Integrated Services Digital Network (ISDN) lines.

Depending on the size of business you operate, you could have either ISDN2 or ISDN30 lines. However, at the end of December 2025, these fixed lines and services will be switched off and services withdrawn.

Find out more about the switch off here.

November 2017 – BT Group announces its intentions to switch off the PSTN network in 2025.

Septemeber 2018 – Openreach commences workshops with service providers that responded to the initial consultation. Daisy were a part of this and continue to be involved.

Summer 2019 – New single order broadband products undergo an early marketing launch. The products will replace existing line rental and broadband offerings.

December 2019 – Six years until the switch off.

December 2020 – Five years until the switch off.

December 2023 – Customers cannot install a new line or increase the number of lines they have on ISDN or multi-line services

December 2025 – PSTN network is permanently switched off.

The 2025 switch-off will affect all businesses currently operating ISDN or PSTN and will likely have consequences for anyone still relying on fixed landlines for communication. If your business has Ethernet in the First Mile, Fibre Ethernet or FTTP services will not be impacted.

If you have an ISDN line you will need to consider new options for your business telephone communications such as VoIP (Voice over Internet Protocol).

Telephone services no longer have to rely on the degrading copper infrastructure from the past and instead, services can be provided using VoIP where your data transmits over the internet
However, for your new VoIP system to work, you’ll need a good quality internet connection so that your VoIP solution can run seamlessly.

If you’ve currently got an ISDN line, you’ll have to upgrade your telephony before December 2025.

If you’re currently on an ISDN contract, you don’t need to do anything at the moment. But, be mindful that when your contract is up for renewal, you’ll probably need to switch to a hosted telephony solution.

However, if you’re looking to upgrade and futureproof your business now, you’ll need to ensure you’ve got a business-grade broadband solution and you’ll need to assess your hosted telephony options to make sure you’re getting the most out of your services.

From September 2023, Openreach will issue a full ‘Stop Sell’ of new supply and there will be no new line installation for Single PSTN Lines or ISDN. Consumer rights during this period will still be upheld so line transfers will be accepted, providing there is no change to the installation when the line moves from one provider to another.

Your provider will strive to migrate all PSTN services to alternative solutions before the December 2025 deadline. However, if services still remain on the PSTN network, then they will be withdrawn in December 2025. If any businesses or consumers have failed to switch to alternative telephony, they will ultimately be left without service.

If you currently have a broadband service that is supported on a single line, your provider will be in touch to migrate this to an alternative single order broadband.

This means that your broadband will move to a single service with no line rental. If you’re using your line for voice you will be offered a Voice Over Internet Protocol (VOIP) alternative. If you already have an ultrafast broadband or ethernet product and do not use any traditional voice services, you won’t see any changes as you’re already using new digital technology.

We’re one of only a handful of providers that are actively involved in industry planning meetings regarding the PSTN switch-off so, rest assured, we’ll keep all of our customers in the loop.

Openreach started trialling the withdrawal of services in two exchanges in September 2019, the first being in its Salisbury exchange, Wiltshire. There is a second site, the Mildenhall exchange, Bury St. Edmunds, which will also begin trial shortly.

Both sites are focused on a complete withdrawal of services by December 2022 with other exchanges not due to enter withdrawal until much closer to December 2025.

VoIP (Voice over Internet Protocol), is a phone system that allows you to make calls over the internet. This will replace traditional PBX telephone systems.

A variety of products will also be released over the next few months that will provide businesses with a broadband equivalent without the analogue phone services they currently receive.

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What is VoIP?

Daisy Hosted Voice Explainer Video

Following the PSTN Switch Off you’ll need to move to new phone system technology, VoIP. Here’s a simple video that explains exactly how Daisy Hosted Voice, our VoIP product, works.

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