Do You Know About The ISDN Switch Off?

ISDN Switch Off

Do You Know About The ISDN Switch Off?

In 2017, BT announced its decision to switch off and deactivate its legacy ISDN lines by 2025. The big ISDN switch off involves a move to an entirely IP-based model of voice communication. Although the target date may seem a long way off, the ISDN switch off has already begun. In the following article, we’ll give you a run-down of how this will affect your business and what you should do in preparation.

Firstly, what is ISDN?

Integrated Services Digital Network (ISDN) is the term used to refer to a group of communication standards that transmits voice and data over copper wires. It is a telephone-based network system introduced in the 1980s as the successor to dial-up technology. It allows both voice and data to be combined and transmitted via one digital line.

Although ISDN allowed for speedy connections in a way that was previously impossible, technological advancements have made new broadband internet access more intuitive, easier to maintain, and much faster. The advent of new modern methods like DSL, WAN, and Cable Modems has made ISDN an outdated legacy system.

How will the ISDN switch off affect your business?

This is the big question on many SMEs’ minds. BT’s announcement shows that it’s time for businesses to change their communication systems if they want to avoid service disruption. Recent reports indicate that there are still more than one million businesses with ISDN connections in the UK, meaning the imminent ISDN switch off will cause some difficulty for businesses that are yet to review their options. Examples of such challenges include less flexibility, high costs, loss of competitive edge, etc. On the other hand, businesses that explore new telephony systems to replace ISDN will reap many benefits. These include greater flexibility and a more cost-effective solution.

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What are the options for handling the ISDN switch off?

Businesses of all sizes and industries need to upgrade their communication systems to stay ahead of the coming changes. Thanks to the rise of fast fiber internet, you can make the switch before the ISDN switch off happens . If your current ISDN contract is up for renewal in the next few years, now is the right time to start exploring a more modern system instead of renewing one that will soon be obsolete.

This is where VoIP comes in

Referred to as the future of telecommunications, Hosted Voice over Internet Protocol (VoIP) is a telephone system that’s located in a data center hosted on the cloud. Because it requires an internet connection to run, you won’t have to worry about using costly old-fashioned phone lines across your business.

Here are some of the top benefits of moving to a VoIP telephony system:

Cost savings: You only pay for your internet connection as international calls and calls between your organisation’s offices are free.

Collaboration: VoIP enhances collaboration as remote workers can log in from anywhere in the world and collaborate through voice, video, and instant messaging.

Scalability: VoIP solves the problem of scalability like no other, allowing for the addition or removal of phone lines depending on your business’ needs.

Rich features: You get access to tons of features, including call forwarding, blocking, caller ID, voicemail, automatic call distribution, and more.


The ISDN has been powering business phone systems for decades now, but that is about to change as BT announced its plans for the ISDN switch off, in favor of online phone systems by 2025. If your telephony contract is up for renewal and you would like to switch to VoIP, we’d love to help. Even if you’re still considering the options and you’re yet to make up your mind, take a look at our VoIP pricing calculator. With prices from as little as £10 per user per month, your business could be saving money and communicating more efficiently sooner than you think.

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ISDN Switch Off