What Happens When BT Phases Out ISDN?


ISDN, or Integrated Services Digital Network, is a technology that has been used for digital telephone calls and data transmission since the 1980s. The UK’s leading telecommunications provider, BT, is planning to phase out its traditional ISDN lines by 2025. This will have a major impact on businesses that rely on ISDN for their phone and internet services.

ISDN has been the backbone of business communications for decades, but BT has now decided to switch to newer technologies, such as VoIP (Voice over Internet Protocol). This means that businesses will need to upgrade their equipment and find alternative solutions for their phone and internet services.

The good news is that there are plenty of options available, and with a little planning, businesses can make the transition with minimal disruption.


Some businesses may be apprehensive about this change, as ISDN has been a reliable technology for many years. However, there are a number of reasons why VoIP is a better option for businesses, including:

Cost Savings: VoIP is typically cheaper than ISDN, both in terms of monthly service fees and equipment costs.

Flexibility: VoIP offers more flexible call routing options, which can be beneficial for businesses with multiple locations.

Scalability: VoIP is easily scalable, so businesses can add more lines as needed without incurring significant additional costs.

Despite the advantages of VoIP, some businesses may still be hesitant to make the switch. However, by following the below simple tips, you can make sure your business is prepared for when BT phases out ISDN. With a little planning, the transition can be seamless and you can continue to provide excellent customer service.


Here are some tips to keep in mind to make the switch easier when BT phases out ISDN:

  1. Upgrade your equipment

If you want to keep using your existing phone numbers, you’ll need to upgrade your equipment to an IP-based system. While VoIP service fees are typically lower than ISDN, you’ll still need to invest in quality VoIP equipment such as phones and adapters. This can be a major investment for small businesses, but there are a number of options available to help spread the cost.

  1. Find an alternative provider

There are a number of providers who offer alternatives to BT ISDN, so it’s worth shopping around to find the best deal. You may also want to consider VoIP (Voice over Internet Protocol) as an alternative to ISDN.

  1. Make a plan

Make sure you have a plan in place so you know what needs to be done and when. The last thing you want is to be caught off guard when BT phases out ISDN. Employees will need to be trained on how to use the new VoIP system, so make sure to allow for sufficient time and resources for this process.


When BT announced that it would be phasing out traditional ISDN lines, there was a lot of speculation about what would happen next. Many businesses rely on these lines for their day-to-day operations, so the thought of them being cut off is a worrying one.

Mint Technology can help businesses to stay connected even when BT phases out ISDN. We have a range of solutions that can keep you up and running, so you don’t have to worry about losing your connection.

To find out more about how we can help your business switch to VoIP, get in touch with us today. We’ll be happy to discuss your options and find the best solution for your business.


If you’re looking to implement VoIP phone systems and you need a specialist who can get you up and running in no time with minimal disruption, get in touch with us today. With years of experience in supporting businesses, we have the knowledge to help you get set up with the latest phone systems.

Call us on 01384 887733 or drop us an email at sales@wearemint.tech.

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