Why ISDN is coming to an end

The Big BT Switch Off- What does the end of ISDN mean for your business?

Last year BT announced that by 2025 they will be switching off their PSTN and ISDN networks and migrating them to a single IP core network. As the date draws closer we look at what this means for UK businesses.

What is ISDN?

ISDN (Integrated Services Digital Network) is a set of communication standards for the transmission of voice and data traffic over the traditional circuits of the PSTN (public switched telephone network).

If you’re reading this article, it’s most likely the service used to run your business telephony system.
Switching from traditional ISDN to an IP based service is simple, especially since companies like ours are available to do all the legwork for you.

What does the switch off mean for my business?

In short, it means that your traditional telephone system will eventually become obsolete. However, there is no need to worry- there’s still time to migrate to an alternative solution.

What are the alternatives?

The most popular alternative for ISDN is a VoIP (Voice Over IP) solution. As the name suggests, VoIP works by transmitting voice data over your existing internet connection.


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Over 1.5 million business users have already made the switch from traditional telephony to VoIP as part of their unified communications strategy. The driving force is the myriad of benefits that come with IP based solutions, such as cost savings, scalability, mobility and simple integration.

When do I need to migrate?

Since the announcement, ISDN is now viewed as a legacy network. This has resulted in a lack of investment from providers, making it harder to effectively manage and maintain. Its expected that by 2020 businesses are unlikely to be able to purchase any systems that run on the ISDN network.

The truth is, the sooner you switch to an IP based service, the sooner you can start reaping the benefits such as cost savings, remote access and disaster recovery.

How should you migrate?

 Contact Arden Group today to find out more about upgrading your business telephony.

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