The 2025 PSTN and ISDN Switch Off – Frequently Asked Questions

Frequently asked questions about the PSTN and ISDN switch off

So, the PSTN and ISDN switch off is happening, below we answer your frequently asked questions on the subject.

What do we know so far?

In 2025 BT are switching off their Public Switched Telephone Network (PSTN) and Integrated Services Digital Network (ISDN) services. This change will affect all residential and business customers and aligns with the Government’s promise to see 15 million premises connected to fibre by 2025. 

For businesses, your phone services will be affected as well as other services that run on your phone lines using the PSTN network. These services include PDQ machines, fire alarm notifications, emergency phones in lifts and burglar alarm monitoring to name a few.

Q: How can I be prepared for the 2025 PSTN Switch off?

A: Ensuring that your current telephony system can support SIP Trunking or opt for a Hosted Telephony Service.

Q: Will I be able to have a fast broadband connection at home?

A: Yes, however, you will have to upgrade to either FTTP (Fibre to the Premises) or to SoGEA (Single order Generic Ethernet Access).  With SoGEA you only get a broadband data service and no telephone line. Therefore, for telephone service, you will have to have a connection to a hosted phone system, or an IP based phone system.

Q: What is the benefit of SoGEA?

A: Depending on location, SoGEA can provide downloads of up to 80Mbs using the current FTTC technology.

Q: After the 2025 PSTN Switch off can I still use my existing telephony equipment such as fax, DECT phone etc at home?

A: Yes, with a hosted phone system and ATA adapter. Connecting these traditional analogue devices to a SIP to Analogue convertor (ATA), will enable them to register on the hosted phone system.

Q: What happens if I haven’t migrated to SIP in December 2025?

A: Any business or consumer who hasn’t migrated to an alternative telephony service will be left without service.

Q: What happens in 2023?

A: In September 2023 Openreach will no longer supply single PSTN lines, ISDN2, ISDN30 or add additional channels to existing services. For more information on the switch off, please join us on our hosted telephony Lunch and Learn where we can answer any of your queries.

Lunch and Learn Registration

5 Things You Didn’t Know About the PSTN and ISDN Switch Off

Things you didnt know about the PSTN and ISDN switch off

In 2025, British Telecom (BT) will permanently switch off analogue phone lines. This may seem some time away, something to worry about later, but businesses must understand the implications of the change and how to prepare for it in good time. Which services are being switched off? What will it mean for your business, and what are the alternatives? There are also some points which you may not know about the switch off which may surprise you!

BT has announced its plans to switch off all public switched telephone network (PSTN) services by 2025. The PTSN consists of the telephone lines, ISDN Lines, and other hardware required to allow traditional analogue telephones to work.

The final switch-off is scheduled for 2025, but BT is phasing out ISDN (Integrated Services Digital Network) and PSTN from 2020 when it will stop allowing businesses to acquire these services.

So here are a few points which you may not have thought about, that aren’t just about phones!

  • Redcare/Alarm lines that are on analogue PSTN lines will be affected
  • Emergency Phones in lifts that are connected to analogue PSTN lines will be affected
  • Domestic analogue telephone lines will be affected
  • PDQ Machines that are connected to PSTN Lines will be affected
  • Broadband Connections such as ADSL and FTTC (Fibre to the Cabinet) will be affected

So, if you do have any of these other services, you will also need to think about how these will be managed and moved ahead of the switch-off.

You can find out more by attending our Lunch and Learn on the 19th August 2021 at 12:30pm. Register by clicking the link below.

Lunch and Learn Registration