In this blog, you’ll learn:
- Why security and resilience are now board-level priorities for UK enterprises.
- What organisations often get wrong when designing communications networks.
- What a secure, resilient communications network looks like in practice.
Secure and resilient communications networks matter more than ever. For UK enterprises, communications networks have gone beyond being solely an IT concern. Now, they’re a critical part of the operational infrastructure.
Business continuity depends on always-on connectivity. The ecosystem now envelops cloud platforms and contact centres, through to Microsoft Teams, mobile workforces and IoT-enabled sites. When that connectivity fails, the impact is immediate and costly.
Poor connectivity costs UK businesses £11 billion per year, driven by outages, degraded performance and network incidents. Persistent outages, when combined with increased cyber risks and regulatory pressures, makes the matter more pressing.
Telecommunications networks form part of the UK’s Critical National Infrastructure (CNI). Both providers and large organisations are legally required to maintain security, integrity and availability of communications services under UK law.
What does this mean for UK businesses? It means that secure, resilient networks are foundational for modern communication needs.
What do businesses often get wrong?
Despite rising risk, many organisations still approach communications resilience in fragmented ways.
Treating voice, connectivity and security as separate problems
Enterprises often fall into the trap of relying on multiple vendors. They buy connectivity from one supplier, voice from another, security as a bolt-on, and cloud services from elsewhere. This creates a complex, fragile architecture with unclear ownership when incidents occur.
Resilience must be designed across the whole network. Even Ofcom has made statements on the importance of network security and resilience.
Underestimating the impact of outages
Downtime is still routinely underestimated. Larger enterprises are at risk of losing at least £8000 per minute of downtime. Those initial losses can soon be followed by reputational damage and a drastic drop in productivity.
It’s why resilience now encompasses limiting the blast radius and improving recovery time, rather than just preventing network failure.
Delaying legacy migration decisions
The UK’s PSTN network is being retired, with full switch-off expected by January 2027. Yet, despite the impending deadline, over 500,000 business lines haven’t switched away from PSTN.
A delayed migration increases risk and complexity, with the chance of service disruption being more likely.
Designing for ‘normal’ conditions only
Many networks are built for average demand. There’s a key lack of consideration for failure scenarios.
UK government guidance stresses the importance of designing for compromise, including power loss, supplier failure, cyber incidents and physical outages. While building for peak traffic feels like the network’s primary objective, continuity is a necessity.
How to build a secure, resilient communications network?
A resilient communications network tends to be designed, rather than assembled. It brings together connectivity, voice, cloud and security into a single, coherent architecture.
Resilient networks start with strong foundations. Think about carrier-grade connectivity, alongside redundant routing and access paths. Voice services should be network-led, as opposed to app-only.
This approach reduces dependency on single platforms and limits failure impact when systems degrade.
Security must also be built-in, and never just seen as a bolt-on. Adopting SASE principles, whereby security and network converge, and implementing continuous monitoring allows improved incident response readiness. The added focus on security comes at a time when the National Cyber Security Centre stresses that cyber resilience has become a leadership and governance responsibility, and not just another IT task.
A communications network should also be designed with multi-site resilience in mind. These enterprises, such as retailers, should look to implement consistent network policies everywhere, with central visibility across all locations and local survivability if a site loses connectivity.
Multi-site failure is now one of the biggest operational risks for large UK organisations, especially in retail, manufacturing, logistics and healthcare.
Organisations, if they’re not already, should be planning to migrate away from legacy infrastructure. Early migration helps organisations audit hidden dependencies, avoiding any high risk, rushed transitions and designing redundancy properly.
Finally, resilient networks require clear responsibility. There needs to be defined accountability for network availability, in addition to supplier assurance and governance. Regular testing of continuity and recovery plans only makes a network more secure and resilient.
What should organisations do next?
Secure, resilient communications networks aren’t built by accident. They’re the result of deliberate design and early, effective decision-making. Network-first thinking is critical in building these resilient networks.
Organisations should be looking at working with a provider who understands network resilience. A managed service provider like this has the knowledge in designing a network fit for purpose. It’s a network that establishes the foundations for future innovation and digital transformation.
Failures are an inevitability. But rather than focusing on preventing every failure, UK enterprises should be looking towards continuity in the face of outages. That’s what a secure, resilient network really means.
Quick Answers: How to Build a Secure, Resilient Communications Infrastructure
What is network resilience in business communications?
Network resilience is the ability of a communications network to continue operating, and recover quickly, during disruption, whether caused by outages, cyber incidents, carrier failure or site-level connectivity loss. It focuses on design, redundancy and governance, rather than just applications or licences.
Why is network resilience now business‑critical for UK organisations?
Modern businesses rely on always‑on communications for operations, revenue and customer experience. As legacy PSTN infrastructure ages and cyber risk increases, outages now have direct operational and reputational impact. Resilience has now transitioned into a core business requirement.
How does the PSTN switch‑off increase resilience risk?
The PSTN switch‑off exposes hidden dependencies on ageing infrastructure that was never designed for modern availability expectations. Organisations that delay migration often discover resilience gaps late, increasing the risk of disruption during unplanned or rushed transitions.
What is the difference between network‑led and app‑led communications?
Network‑led communications are built on carrier‑grade infrastructure, redundancy and routing at the network level. App‑led services rely primarily on a single platform or cloud application, increasing dependency and potential single points of failure during outages.
Why does network‑led design improve resilience?
By controlling connectivity, routing and resilience at the network layer, failures can be isolated and managed without taking entire services offline. This reduces blast radius when platforms degrade and improves recovery speed when incidents occur.
Why are network‑first providers more credible in resilience conversations?
Providers that own and operate network infrastructure can design, test and guarantee resilience outcomes more effectively than SaaS‑only vendors, who often depend on third parties for availability and recovery.
