ISDN Switch Off 2025

Why wait? Switch over to cloud comms and reap the rewards today

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Call me today on 0800 160 1111 to chat about your ISDN options.

ISDN switch off – Making the switch to modern tech

Back in the late 1980’s ISDN was launched to enable multiple calls to happen at the same time over a single phone line. More than 30 years later and it’s definitely served its time, so ISDN is soon being switched off to make way for more up-to-date technology.

With copper phone lines degrading fast and being replaced by faster, fibre solutions, there are two new technologies that modern businesses are embracing. These new solutions give more flexibility and enhanced functionality at a lower cost.

There are loads more benefits of making the switch to either SIP Trunks or Cloud Telephony and we’re here to help you make the right choice.

The benefits of moving from ISDN to either SIP or Cloud Telephony

  • Lower costs: SIP and Cloud Telephony are more cost-effective, usually including minutes in a single monthly cost.
  • Supports hybrid working: Cloud Telephony supports hybrid working, enabling you to make and receive calls from anywhere on any device.
  • Improved customer experience: Both SIP and Cloud Telephony are feature-rich and will help you provide a far superior customer experience.
  • Quick and easy installation: SIP and Cloud Telephony can both be installed remotely and enable you to keep your existing phone numbers.
  • Scalable with your business: SIP and Cloud Telephony allow for easy scalability which enables your technology to grow with your business.

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Your options for moving away from ISDN

SIP Trunks

With SIP Trunking you can route calls over your business internet connection at lower costs. This is the choice for you if you’ve recently invested in an on-site PBX or just want to keep what’s familiar, while also gaining access to enhanced capabilities.

More on SIP Trunking

Cloud telephony

VoIP cloud phone systems provide advanced calling features and an easy way to answer calls on-the-go on any device. Choose Cloud Telephony if you want to move your communications fully to the cloud and have no on-site hardware to maintain.

More on Business VoIP Phone Systems


ISDN technology will be switched off in 2025 with stop-sell happening in 2023. If you’re one of the million UK businesses still using it, you need a plan to move.

ISDN stands for the Integrated Services Digital Network and was launched in the late 1980’s to make and receive multiple calls into businesses. ISDN splits the traditional copper phone line (PSTN) into multiple digital channels allowing people to make and receive calls simultaneously on the one physical line. With the whole service relying on copper wires, it’s been degrading over the past 30+ years and can’t keep up with the faster connection speeds provided by new fibre technology.

ISDN is now way past its expiry date – just think about your life in the 1980’s compared to today. Are you still wearing a shell suit, creating mixer tapes from the Top 40 countdown and driving a Ford Sierra? No, of course not, you’ve moved on and so should your communications.

Both SIP and Cloud Telephony are robust, mature solutions that millions of businesses use every day to give them flexible communications solutions. Choosing which is right for you is down to one key consideration – whether or not you want to keep your on-site PBX – after that they both have multiple benefits.

Choose SIP if you’ve recently invested in an on-site PBX or just want to keep what’s familiar

Benefits of moving to SIP:

  • Cheaper call and line costs
  • Lines can be quickly and easily added
  • Calls can be easily re-routed
  • Greater resiliency over ISDN

Choose a Cloud-Based Phone System if you want to move your communications fully to the cloud and have no on-site hardware to maintain

Benefits of moving to Cloud Telephony:

  • Cheaper call and line costs
  • Users can be quickly and easily added
  • Calls can be easily re-routed
  • Greater resiliency over ISDN
  • Includes a vast range of call features
  • Enables anywhere, any device calling
  • Facilitates unified communications

Switching your ISDN to Cloud Telephony or SIP can deliver huge savings with averages of around 50% and often up to 70%.

Take a look at our customer example below:

ISDN cost savings

ISDN is being switched off, there’s no avoiding it. So, making the switch now means that you get to enjoy all the benefits of moving over to a modern technology solution sooner.

  • Cash in by reducing your costs now, not in a few years time
  • Benefit from better call features and anywhere comms
  • Improve your customer experience
  • You’ve got to do it anyway, so why wait?

Making the ISDN switchover easy and enjoyable

Switching from ISDN doesn’t have to be expensive or stressful, we can help manage every facet of your transition. Our brochure takes you through all of the benefits of moving away from your legacy tech and why switching now can benefit your business.

Download brochure

The National Domelight Company says goodbye to ISDN

They needed an updated and future-proofed technology that would allow them to work remotely, be productive in any location and provide a better experience to their customers. Have a read to see how we helped them achieve this.

View case study