Prepare for the PSTN switch off before it impacts your business
The PSTN switch off deadline is approaching and doing nothing is not an option. Legacy phone lines, ISDN services, and connected systems will stop working by 2027, forcing organisations to act now. Resonate helps you move your phone system to the cloud, simplify complexity, and turn your migration into an opportunity to modernise communication and unlock long-term value.
The Challenge
Why PSTN switch-off is more complex than it looks
Unclear visibility of legacy dependencies
Many organisations underestimate how many services rely on legacy lines — from PBX systems to alarms and payment systems.
Risk of service disruption
Without a structured plan, the PSTN switch off business deadline creates risk to critical operations when legacy services stop working entirely.
Complex migration decisions
Choosing how to migrate PBX to teams, and implement SIP trunk migration to deliver isdn replacement for your business can introduce technical and commercial complexity, especially as in many telephony estates there is limited awareness of services being used today.
Scaling transformation across the estate
Global sites, legacy infrastructure, and hybrid environments make legacy pbx replacement and cloud migration difficult to execute consistently.
The Solution
A structured approach to PSTN switch-off and migration
Resonate delivers a structured approach to help organisations move their phone systems to the cloud and transition from legacy infrastructure.
- Assess your current estate,
- Identify dependencies,
- Design the right approach
- Migrate your legacy pbx to a cloud voice solution, including SIP trunk migration.
- Specialists in solutions from multiple providers such as Microsoft Teams, Cisco Webex and Ring Central, means we can deliver the best solution for your organisation
Our methodology ensures minimal disruption while enabling you to modernise your communications platform and fully prepare for the pstn switch off deadline.
Time is running out act now on PSTN switch-off
- Avoid disruption by preparing for the pstn switch off business deadline
- Reduce complexity through legacy pbx replacement and consolidation
- Enable flexible working and Improve cost control with scalable cloud-based communication platforms
- Unlock long-term value by choosing to modern your communication platforms
Your partner on PSTN switch-off transformation
Resonate combines deep voice expertise with a structured delivery approach to support your pstn switch off business journey. From discovery and planning through to migration and optimisation, we guide you through how to migrate to teams phone or alternative cloud solutions. We ensure your transition is seamless, scalable, and aligned to your wider communication strategy — turning mandatory change into strategic advantage.
01What is the PSTN switch off and how does it affect my business?
The pstn switch off business refers to the retirement of the UK’s legacy copper-based phone network by January 2027. Any services relying on traditional phone lines will stop working and must be replaced with digital, IP-based alternatives.
02What is the best way to move phone system to cloud?
The best way to move phone system to cloud depends on your current environment. Options include migrate pbx to teams, SIP trunk migration, or full cloud telephony replacement, depending on your needs.
03What is ISDN replacement for business?
ISDN replacement business involves replacing legacy ISDN and PSTN systems with modern alternatives such as VoIP, SIP, or Microsoft Teams-based voice solutions that use internet connectivity instead of copper lines.
04How do I migrate PBX to Teams?
To migrate your PBX to teams, organisations typically assess their current estate, select a calling model (Direct Routing, Operator Connect, or calling plans), and migrate users and services in phases to avoid disruption.