BT ISDN Switch Off: Essential Information

If you are curious to discover how BT’s ISDN switch off will impact your business, you are in the right place. 

PSTN and ISDN are now considered outdated technologies. PSTN is the same phone line that most people have at home (unless you live in a relatively newly built house) where analogue voice data travels over circuit-switched copper phone lines. 

Maintaining multiple legacy networks can be very costly for BT. By transitioning to VoIP technology and converging all services – voice, data, video, and even broadcasting – onto the IP protocol, BT streamlines operations by maintaining only one network instead of several.

In summary, BT is moving its entire voice network to voice over IP (VoIP) with the PSTN scheduled to be switched off in January 2027, a notable change from the originally planned December 2025.

Since 2020, businesses have been unable to purchase any systems that utilize PSTN or ISDN, especially with the ISDN switch off approaching. With January 2027 less than 2 years away, if your current traditional telephony contract is up for renewal within the next 12 months or if you’re looking to embrace the latest technology, now is the perfect time to explore the benefits of VoIP technology and assess your business broadband options.

While VoIP technology does not consume as much data as other services like video, it's essential to ensure that you have sufficient bandwidth to support voice communication alongside your office's other activities. By reaching out to us, we can provide guidance on the best connectivity solutions and business broadband options available, especially in light of the ISDN switch off.

After reading this page, the next logical step is to get in touch with us. We can arrange in-person meetings or an online conference call to discuss how we can assist you with your business broadband needs, especially in light of the ISDN switch off and the advantages of VoIP technology.