Telecoms: The ISDN switch off

By Neil Hutchinson, Business Development Director, Everything Voice

Introduced in the 1980’s, ISDN (or Integrated Services Digital Network) is still a common method of connecting a business telephone system to the Public Telephone Network. When it was first introduced to replace Analogue telephone lines, ISDN also offered Direct Dial Numbers and the ability to transfer a call externally. Eventually the vast majority of businesses used ISDN for their inbound and outbound telephone calls.

Fast forward into the 21st century and sales of ISDN have been in steady decline for years as businesses find new and more innovative ways of deploying their business communications. During this period, an extensive IP (Internet Protocol) network has been built which runs alongside the old Public Telephone Network – and about time, since this has been in place since the 1800’s! It therefore comes as no real surprise that BT has announced the run down and eventual switch off of their ISDN service which so many businesses are still using today.

What are the timescales?

In 2020 orders of ISDN will no longer be possible, and in 2025 Openreach will effectively cease ISDN services which means that if you have one of the existing 2.5 million ISDN services currently running, your business needs to take time to plan a migration.

Upgrade to VoIP for FREE

Everything Voice has been deploying enterprise-grade VoIP telephony solutions for many years and have already helped many hundreds of people transition away from ISDN.

If your business is looking to make this transition – you may want take just one minute to apply for one of our FREE VoIP systems which are currently available – please click below.

Alternatively, please read our guide below on the benefits of Hosted VoIP, or contact us for some advice on 0330 055 3570 or

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