ISDN Becoming Obsolete: How to Future-Proof Your Business with VoIP

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ISDN Becoming Obsolete: How to Future-Proof Your Business with VoIP

BT have begun phasing out ISDN lines in 2020, and will switch them off completely in 2025. What does this mean, and how might it impact your business?

Non-VoIP systems are quickly becoming outdated, as more businesses recognise the numerous advantages of Voice over Internet Protocol (VoIP) systems. VoIP systems provide advanced features, such as call routing, auto attendant services, multiple extensions, and integration with other systems, to ensure your business is future-proof and ready for any challenge. So if you want to ensure that your business is up to date and ready for the future, you should consider making the switch to VoIP.


What is VoIP for businesses?

man working in an office traditional

Think of your basic phone setup at home or in your workplace. Many businesses right now will rely on ISDN lines to carry out their day-to-day business activities. ISDN lines are digital phone lines that allow for faster data transmission than traditional analog phone lines. They are commonly used for internet access, video conferencing, and other data-intensive activities.

Instead of relying on ISDN, many businesses have switched over to using innovative technology such as Voice over Internet Protocol (VoIP) and video conferencing to transmit conversations and meetings over the internet. VoIP technology works by breaking down audio into digital signals, which are then transmitted over the internet, allowing for clear and reliable communication without the need for expensive phone lines. Both VoIP and video conferencing can be used to great effect for business, allowing for a much more cost-effective way of communicating with colleagues, customers and suppliers.

How to check if your business is using ISDN lines

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If your business is still using ISDN lines, you can easily find out by checking your phone bills. Most phone bills will list the type of line you are using, and if you are using ISDN lines, you’ll see the words “ISDN” or “digital” listed there. You can also check with your phone provider to find out more information about the type of lines you are using.

If you're not sure if you are using ISDN lines, you can also check the equipment in your office. ISDN lines usually come in the form of a black box, often with several ports for plugging in phones and other equipment. If you find one of these boxes in your office, then it is likely that you are still using ISDN lines.

Why make the switch to VoIP at all?

woman working from home office remote worker

A VoIP system offers several advantages over traditional phone systems, which often make it the preferred choice for businesses of all sizes. It is usually cheaper than traditional phone systems, and can be used from anywhere with an internet connection. This means that businesses no longer have to be tied to a single location for their communications, but can instead have employees work from anywhere.

It is also more flexible, allowing businesses to easily scale up or down according to their needs. Furthermore, VoIP systems often come with a wide range of features such as call forwarding, voicemail, and conference calls, allowing businesses to stay connected and manage their calls more efficiently. And now with alternative connectivity options becoming obsolete, VoIP will soon become the only option for any business. All in all, VoIP systems are a great choice for businesses looking for an affordable, flexible, future-proofed and feature-rich phone system.

What does my business need to do to switch over to VoIP system?

If your business isn’t on VoIP yet, don’t worry. It isn’t a long and arduous process, but your business will need to make a few important decisions and likely get a partner involved to help you get everything set up exactly the way you need it.

Firstly, you'll need to acquire the necessary hardware and software, such as phones, phones systems, routers, and any additional components that are necessary for your business. Think about your conference rooms as well as desk materials that will need upgrading or replacing.

engineer working on nterworking and connectivity rack

Secondly, you'll need to configure the system, taking into account any potential issues that may arise with such a transition. Mapping out the functionalities that you’re looking to preserve and any upgrades you want to make during the process will help you, and your VoIP integration partner, keep on top of everything.

Finally, you'll need to set up the network, which will involve connecting all the components together, such as the router, modem, and other devices, as well as configuring the settings to ensure that the system is running smoothly and efficiently. You'll also need to make sure that the network is secure, by setting up firewalls, password protection, and other security measures, so that the system is protected from any malicious intruders. Finally, once all the components have been connected and the settings have been configured, you can test the network to make sure that it is working correctly.

Additionally, depending on the complexity of the system and the size of the business, you may need set up long-term support and maintenance with your integration partner. As your systems will now be running over the internet, support will likely be available remotely, saving you call-out and repair costs in the long run.


The phasing out of ISDN lines in 2020 and the switch-off in 2025 is making non-VoIP systems rapidly become obsolete. Businesses should consider making the switch to Voice over Internet Protocol (VoIP) systems in order to future-proof their business and take advantage of the numerous advantages they offer.

With the right preparation and planning, your business will be able to switch over to a VoIP system with minimal disruption. Speak to our networking and connectivity team to handle the process swiftly and efficiently, with a personal touch. If you don't have an internal networking and connectivity team, or an existing external supplier, our team are always happy to answer questions and help you find the right solution.