ISDN Switch Off

With the year we’ve had, upgrading your business’ phone system is probably one of the last things on your mind, however BT are switching off their ISDN in 2025, so it’s worth thinking about sooner rather than later!

BT currently has around 2 million ISDN customers that will be affected by the switch off, meaning businesses won’t be able to use their old phone systems anymore, making all old equipment redundant. Change is inevitable and needn’t be a bad thing, so if your current ISDN phone contract is up for renewal soon, then don’t waste any time switching.

The main reason for the change is due to the recent investment in new fibre infrastructure. Whilst analogue data (PSTN and ISDN) is sent over copper wires, fibre optic cables allow digital data to travel through fine hair-like glass fibres, by carrying light transmitted by an LED or laser. Fibre is not only faster than copper, but is also more cost effective, and more importantly for businesses, more resilient.

The takeover of fibre lines means that IP internet-based solution such as VoIP and SIP are the top alternatives, but what is the best solution for your business’s telecommunications needs? At Delta 365, we look at the needs of each business and suggest a bespoke solution based on your requirements.


The most popular telephony solution is VoIP. VoIP (Voice over Internet Protocol) is a digital cloud-based telephony solution which hosts your phone system online and allows you to make calls over your internet connection. VoIP is extremely flexible; you can use your phone anywhere there’s an internet connection, so you are always in touch with your customers via a crisp, clear and reliable connectivity- none of the intermittent issues that can freely occur over telephone lines.

During the national lockdowns in 2020 and 2021, modern technology allowed many businesses to keep running by utilising remote working. VoIP was also a leading force in the switch to remote working, allowing employees to stay connected as if they were in the office, via an app on their mobile.

So think of the ISDN switch off as a good thing! It will allow businesses to rethink how they operate. With less need for office space due to remote working, money can be spent on other parts of the business, such as recruitment and marketing. Although the 2025 deadline still a while away little way out, businesses have the opportunity to take control of their future and turn a technology change into an operational advantage.

For more information on how VoIP could help to transform your business’s communications strategy, contact us today on 08081 691 365 or email and let us tailor a reliable bespoke telecoms solution for your business.


There is no comment on this post. Be the first one.

Leave a comment