What is ISDN?

ISDN (Integrated Service Digital Network) is a set of digital communication standards for the transmission of voice and data. It consists of physical copper and fibre optic lines connected via telephone exchanges across the world.

ISDN has been around for many years and has been considered the main solution for businesses when it comes to their communications.

There are two types of ISDN phone lines – ISDN2 and ISDN30e.

  • ISDN30e services are more about providing high-performance voice services for business that need a minimum of 8 channels.
  • ISDN2 is similar to a standard phone line although with ISDN2 the lines can be used for phone and data calls.

It is worth noting that BT plan to phase out ISDN phone lines by 2025 and that you will no longer be able to purchase any additional lines by 2023. This is a silent nod that IP solutions are achieving the same (if not better) standard of service so they are dedicating time and resource to the new technology.

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