Cyber Resilience
Protect your business from cyber risk.
View Services
PSTN Switch-Off Telephony
Prepare your organisation for the full transition from traditional telephony to a secure, flexible internet-based voice and collaboration platform.
Why the switch matters
In 2027, the traditional ISDN/PSTN network that underpins analogue and legacy telephony will be switched off by BT Openreach, requiring migration to a VoIP (Voice over Internet Protocol) cloud-based solution.
Waiting until the last moment puts your business at risk: installation demand may surge, transition complexity can increase, and business continuity may be threatened.
What are your options to get ready for the PSTN switch-off?
VoIP will become the technology behind your communication infrastructure. This will allow you to communicate over the internet via voice, video, images, and files. Part of your communication may already be using this technology if you are using applications such as Teams, Zoom, WhatsApp and FaceTime for calls and video. Benefits include:
Cost-savings & simplified billing with no hardware purchases, fewer call charges.
High availability & continuity with 99.999% uptime, inbound call diversion ready.
Remote & hybrid working support with voice & video, messaging across any device.
Scalability & flexibility through self-service management without needing major equipment upgrades.
All provided with local end-user support through our dedicated team.
How we work
We follow a clear, phased approach so you get a smooth migration from legacy telephony to modern voice and collaboration:
- Discovery & readiness
We assess your current setup, usage patterns, call flows and future needs. - Planning & design
Choose the right VoIP/cloud platform, map migration paths, and set timelines to avoid end-of-line pressure. - Implementation & migration
Deploy the cloud-voice infrastructure, migrate users and features, configure self-service options and ensure business continuity. - Training & support
Equip your team with the tools and knowledge to use the new system effectively. - Ongoing monitoring & evolution
Telephony doesn’t stand still; we’ll review usage, optimise features and adapt as your business grows.
The result is a seamless, future-ready telephony solution that keeps your business connected and collaborative. Get in touch today to start planning your transition with our specialists.
Frequently asked questions
-
BT Openreach has scheduled the full withdrawal of the traditional network for 2027, which means every business still using legacy telephony must migrate before that date.
-
Yes, it’s wise to begin the transition early. Waiting risks installation delays, limited vendor availability and potential disruption to your operations.
-
Absolutely. Modern platforms go beyond voice and include video calls, messaging and screen-sharing, all beneficial for remote and hybrid work.
-
Without migration, you risk loss of service or status at the switch-off date. Legacy hardware may become unsupported, and your business continuity may be jeopardised.
-
Yes. The cloud-based model allows you to scale user numbers, features and devices without major new hardware investment.
Keep your telephony connected, agile and resilient
Don’t wait for the network switch-off to force your hand. With Net-Defence’s PSTN Switch-Off Telephony Services, you’ll gain a robust, modern communications platform that ensures you’re ready for the future.