ISDN SWITCH OFF:
WHAT WILL REPLACE IT?
Did you know the UK is set to switch off ISDN phone lines by 2027?
From 31st January 2024 all businesses will say goodbye to analogue lines, and move to VoIP. The ISDN switch off will impact 6 million businesses that are yet to upgrade broadband or phone systems.
The demise of the ISDN line certainly isn’t negative for business though. VoIP systems, deliver many benefits and will transform your comms for the better both now and into the future whilst providing cost and productivity advantages. It’s time to think about switching now – fill in the form below to see how we can help.

One of the 6 million businesses still ISDN phone systems or ADSL broadband?
Consider upgrading now as Openreach will soon be switching off the PSTN network.
WHAT IS THE ISDN SWITCH OFF?
The ISDN switch-off refers to the process of discontinuing the use and support of ISDN technology by telecommunications companies in favour of more modern and advanced technologies powered by broadband internet.
Many UK businesses are still using the ISDN system and will require upgrade to a newer system before the end date.
WHEN WILL ISDN BE SWITCHED OFF?
The current set date of the ISDN switch off is 31st January 2027. This date is an extension from the previous date which was December 2025.
If there are further extensions we will update when any are announced.
ISDN SWITCH OFF TIMELINE
WHAT ARE THE RISKS OF THE ISDN SWITCH OFF?
The largest risk facing businesses around the subject of the ISDN switch off is complete loss of phone communication. If a businesses are not prepared before the switch off date they might find that they’re at a back of a long queue of instillations whilst also having no telephone system. This could cost businesses customers and revenue.
WILL ANYTHING ELSE BE AFFECTED BY THE ISDN SWITCH OFF?
Some CCTV and Alarm systems use the ISDN / PSTN network and might be affected by the ISDN switch off. Get in contact with your providers to ensure your business is still protected.
WHAT ARE PSTN AND ISDN?
WHAT WILL REPLACE ISDN AND PSTN?
VoIP – VOICE OVER INTERNET PROTOCOL
WHAT IS VoIP?
THE BENEFITS OF VoIP
CALL QUALITY
MULTI-FUNCTIONALITY
SECURITY
PORTABILITY
FEATURE PACKED
COST EFFECTIVE
SIP TRUNKS
PSTN or ISDN circuits enable you to make external business calls, but they will be phased out in 2027. SIP Trunks are the modern way of transferring your external calls over the Internet.
Do you need to invest in SIP Trunks? No, Not with Enconvo Contact. Our business telephony solution comes with embedded SIP trunks, which means you have one bill, and all your external & internal calls will be managed by us. Enconvo integrated SIP Trunking offers better flexibility & cost efficiency. We also have built-in disaster recovery, which can be scaled up or down without additional physical line installation.
BENEFITS
- Cost savings of up to 50%
- No more physical infrastructure
- No costly hardware investment
- Simple management
- Increased reliability
- Keep your existing numbers
- Better flexibility
- Built-in disaster recovery
- Totally scalable
- Perfect for remote working
A business telephone system is a phone system which improves your company’s ability to communicate at scale.
Traditional phone systems are built using analogue technology, this system is expensive and lacks features which modern businesses require to be successful.
Modern features such as:
- Multi line holding
- Auto attendant
- Download Voicemails
- Call recording
- CRM software connections
- Mobile integration
Modern day VoIP business phone systems use the Internet instead of a landline to transfer voice data at a much faster speed and at a lower cost.
The system is made up of a phone, computer, internet connection and a PBX box either hosted in the office or on the cloud. Cloud hosted PBX boxes help businesses become more dynamic with their work allowing for employees to work from home whilst retaining an office phone number and all the system features.
No, if you transfer your number to a new VoIP system you can almost always transfer your current number.
Depending on the phone system you choose we have many options to help you install the phones.
In many cases the system will be a simple plug and play. If you occur problems our support team have exceptional facilities to live video guide you through installation.
We provide free on site support for large installations or issues unresolvable by call/video.
The following Openreach products will no longer be available when analogue services are switch off in 2027:
- WLR3 analogue
- ISDN2
- ISDN30
- LLU SMPF
- SLU SMPF
- Narrowband Line Share
- Classic Products
All of these products may also be known as WLR products.
Yes, when you upgrade to a VoIP service we can provide you a single order broadband such as SoGEA. This will remove the need for a phone line but ensure your business remains connected.
You will not be able to opt out of the ISDN switch-off. If your business has not upgraded to a VoIP service by 31 January 2027, your phone and/or broadband services will cease.

Openreach are tracking the entire shift from analogue lines to VoIP. Since 2022 Openreach has gathered data to identify edge cases, ensuring solutions can be found for all industry. Below is a list of fact sheets, including alarms, energy, healthcare, water, telecare and lift industry direct from Openreach.

ARE YOU READY FOR THE ISDN SWITCH OFF?
PREPARE TO MAKE THE SWITCH
ISDN will soon be a thing of the past : what will replace it?
The end of ISDN is approaching, but what should you do?
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HERE’S WHY YOU SHOULD CHOOSE ENCONVO
25 YEARS OF AWESOME
25 years in telecoms has taught us many things and brought us multiple awards. In the UK we’ve helped over 5,000 businesses just like yours and throughout Europe, the group has over 2 million users – all communicating more efficiently, being more productive, saving time, money and stress.
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HERE’S WHY YOU SHOULD CHOOSE ENCONVO
WITH YOU ALL THE WAY
Working wonders for you is what our amazing people do. Your dedicated Account Manager and in-house engineering team really know their stuff and are always on hand when you need them. Most importantly, they make every contact a breeze and interactions a delight.
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HERE’S WHY YOU SHOULD CHOOSE ENCONVO
COMMUNICATION, NOT HANDSETS
We turn handsets, advanced software and innovative tech into money saving, business boosting, award winning solutions for you. We’re continually tracking down new products so you can take advantage of all the whistles and bells of the very latest in business communications.
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HERE’S WHY YOU SHOULD CHOOSE ENCONVO
SOLID AS A ROCK
We know how critical contact is to your business so think of us like a faithful friend – always there for you, never letting you down. Nobody’s perfect, so if ever there is a problem, we’ll be on it in a heartbeat, with no drama, getting you back on track in a jiffy.