Even the most well-planned technology projects can uncover hidden risks. A PSTN migration is no different. Legacy contracts, undocumented services, and siloed teams consistently derail timelines and inflate costs. Many organisations see this transition as a daunting, mandatory step, and even when you try to cover every angle, unforeseen pitfalls emerge.
Understanding these common challenges and getting ahead of them is the key to a successful migration. Otherwise, you risk increased costs, significant delays, and critical operational disruption.
So, what are the common planning mistakes that most teams make?
Four Hidden Risks in Every PSTN Migration
Most businesses approach their PSTN migration like a simple system upgrade. In reality, it’s more like pulling a live wire from an old building—until you know exactly what’s connected, you don’t know what could suddenly go dark.
The challenge isn’t just about the infrastructure; it’s about uncovering the friction points hidden in your operating model. These are the four that consistently cause the biggest problems.
Legacy Contract Lock-Ins
Before you start, review all your supplier contracts. Are you locked into long-term agreements that prevent commercial flexibility? Unforeseen penalties for early termination can inflate your costs before the project has even begun. A thorough contract audit is a non-negotiable first step to ensure you can move when you need to, without financial penalty.
The Incomplete Service Inventory
No matter how well you plan, unrecorded lines for fax machines, lift phones, alarms, and door entry systems almost always surface during the migration. These are often leftovers from previous mergers or are managed by facilities teams, sitting completely outside of IT’s visibility. It is absolutely critical to engage with facilities and operational teams from day one to ensure nothing—and no one—is missed.
Vendor Overload and Misalignment
Coordinating multiple vendors for voice, data, and security is a recipe for complexity and delay. It creates unnecessary communication overhead, conflicting schedules, and friction between suppliers. This fragmentation not only impacts productivity but also creates gaps in accountability. A single, unified partner removes this headache and ensures a cohesive migration strategy.
The Flaw of ‘Lift and Shift’ Thinking
Treating the PSTN switch-off as a simple like-for-like replacement is the biggest missed opportunity of all. This “lift and shift” approach ignores huge potential for optimisation, resilience, and cost savings (such as re-routing expensive 08/03 non-geographic numbers). Failure to re-engineer your network for an all-IP world can lead to future performance bottlenecks, security vulnerabilities, and a disconnected communications strategy. This is your chance to modernise, not just replace.
Don’t Forget Security in Your New All-IP World
As you move to a fully digital infrastructure, your security posture must evolve with it. Ensure that robust encryption and modern perimeter defences are central to your migration plan. We strongly recommend integrating voice traffic into your centralised MDR and SASE frameworks to gain complete, end-to-end visibility and control.
Finally, validate that your new solution complies with all sector-specific standards (such as PCI-DSS in retail or HSCN in healthcare). This ensures you adhere to best practices and meet all mandatory security requirements from day one.
Maintel’s Value: From Uncertainty to Operational Certainty
With a 30-year track record in complex communications and infrastructure transformation, Maintel brings a unique advantage to PSTN projects: operational certainty.
From initial discovery to secure, seamless migration, we ensure that your modernisation journey doesn’t interrupt your mission-critical services. We’ve managed this transition across every major sector, and we bring that experience to de-risk your project.
Start your journey with confidence. Access our PSTN Readiness Assessment here
Book a no-obligation consultation with one of our experts to kick-start your PSTN discovery today.