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Ready your business and realise the endless opportunities by going all-IP


If your business communications are still operating on a PSTN/ISDN network, then now is the time to upgrade to an all-IP solution. 

The Public Switch Telephone Network (PSTN) will close by December 2025. By then, every phone line in the UK will have moved to a fully digital network that uses Internet Protocol (IP) across a fibre-based service.


This won’t just affect voice services, it may also mean you need to upgrade your broadband. Any equipment that currently uses the PSTN will stop working: alarms, EPOS machines, door entry systems, CCTV, faxes, and so on.

By moving to an IP-based solution now, you will future proof your business and avoid any disruption to business-critical communications.  


What is ISDN?

ISDN stands for Integrated service digital network. It's a digital line that runs over a traditional copper wire. The problem with ISDN and PSTNTN is that with  businesses and homes using growing amounts of data, the current infrastructure and bandwidth just isn't sufficient for the modern world. 

Why is it being
switched off?

The UK's current phone network is old and difficult to maintain. As an essentially 20th century technology, the PSTN is increasingly out of kilter with the demands of 21st century communications.

Traditional phone usage is changing everywhere as people switch to mobile and internet communications. We all expect much more from modern phone services than the traditional technologies can deliver.

What do I need to do?

Take the opportunity to consult a reliable communications  expert such as Garnell. We will work with your business to find the best solution for your requirements and fully project-manage the upgrade and solution thereafter 


The benefits of a VoIP solution for your business

Upgrading from traditional ISDN to VoIP will give your business  phone system a greater range of features and flexibility. Plus, with cheaper call rates and no upfront investment, it's cost effective for your business. 

Flexible Working

Our solutions help businesses become more efficent by enabling flexible working enviroments through home working, hot-desking  and extending the service to your mobile or PC.

Lower call costs

Many of our solutions offer all the benefits of IP telephony including free site-to-site calls and cheaper call rates. Plus, IP solutions require no hardware maintenance, reducing your costs even further.

Full control

A VoIP solution puts you in complete control of your business telephony. Benefit from a wide range of call handling and management features, plus you also have the full support of Garnell to manage your system.

Auto Attendent

You can use Auto Attendent to provide callers with call routing optionsfor different areas of the business or create announcements to inform callers of details such as opening hours when the office is closed.

The switch process


Step 1

Finding your right solution 

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Garnell will work with you to establish your business requirements and create a bespoke solution


Step 2


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Planning such as a site survey will be carried out to prepare for the new solution and alleviate any down time.  

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Your account manager and tech team will be on hand for the go-live to make sure you are fully up and running.

Step 3


We work with some of the UK's most innovative hosted providers and manufacturers



SIP is ideal if you already have an existing system and supports a wide range of PBX’s. SIP from Garnell will give your business a more flexible, resilient and scalable, cost efficient solution when compared against ISDN.

Garnell provide clients with a feature management portal, enabling you to monitor and make changes to call flow, any other major changes you would like to implement.

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So what are you waiting for?

It's time to get ready for an all-IP world.


Start your FREE VoIP quote

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