PSTN Landline
replacement solutions
Seamlessly transition from legacy PSTN connections to our future-proof LANDLINE-4G solution with multi-network redundancy and real-time monitoring.
PSTN is ending – is your business ready?
The UK’s legacy phone network—the PSTN—is being permanently shut down by January 2027. That means every traditional phone line and analogue connection will need to transition to digital alternatives over a fibre-based IP network.
At ControlFreq, we specialise in helping businesses seamlessly upgrade to modern, reliable communication systems—ensuring continuity, compliance, and zero downtime. Let us help you prepare for a smooth transition away from PSTN.
How our 4G Landline replacement works
Our solution provides a seamless transition from traditional PSTN lines to advanced 4G-VoLTE technology, ensuring your critical systems remain operational.
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1. Simple Installation
Connect our LANDLINE-4G device to your existing system with standard RJ11 connectors. No technical expertise required.
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2. Automatic Connection
The device automatically connects to the strongest available network, with multi-network redundancy for maximum reliability.
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3. Monitor Performance
Access our optional WebAlarm cloud platform to monitor device status, connection quality, and receive real-time alerts.
Which technologies still rely on PSTN?
Our PSTN Landline Replacement Solutions upgrade critical systems—like lift phones, alarm panels, and entry controls—by replacing outdated PSTN lines with reliable, future-proof digital connectivity.
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Emergency Lift Phones
Maintain critical communication in elevators for contacting maintenance or emergency services during breakdowns or entrapments.
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Fire & Security Systems
Ensure reliable transmission of fire detection, intruder alerts, and security monitoring signals to monitoring centres.
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CCTV Systems
Ensure security camera systems and monitoring equipment continue to transmit data and alerts without relying on PSTN lines.
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Door Entry Systems
Maintain access control in residential and commercial buildings, allowing seamless communication between entrances and occupants.
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ATM Machines
Keep ATM machines operational to ensure uninterrupted cash withdrawals and banking services in all locations.
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Critical Infrastructure
Maintain essential systems like traffic lights, railway signals, and motorway signage that previously relied on PSTN connections.
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Telecare Devices
Ensure reliable communication for personal alarms used by elderly or vulnerable individuals during emergencies like falls or medical distress.
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Custom Solutions
Need a specialised solution? Our team can develop custom configurations to meet your specific industry requirements.
4G Landline device features
Our solution offers enterprise-grade reliability with cutting-edge technology to ensure your critical systems never go offline.
4G-VoLTE Technology
Utilises advanced 4G-VoLTE technology to provide crystal-clear voice communication with minimal latency, ensuring reliable operation of your critical systems.
Multi-network Redundancy
Automatically connects to the strongest available network with seamless failover between multiple carriers, ensuring maximum uptime even during network outages.
Universal Compatibility
Features standard RJ11 connectors to seamlessly integrate with your existing equipment without requiring any modifications to your current setup.
Battery Backup
Includes an integrated battery backup system that provides up to 24 hours of continuous operation during power outages, ensuring critical communications remain available.
Technical specifications
| Specification | Details |
|---|---|
| Connectivity | 4G-VoLTE with multi-network SIM |
| Power Input | 100-240V AC, 50/60Hz |
| Battery Backup | Up to 24 hours (Li-ion 5200mAh) |
| Interfaces | 2x RJ11, 1x Ethernet, USB-C (power) |
| Dimensions | 180 x 120 x 45 mm |
| Operating Temperature | -10°C to +50°C |
| Certifications | CE, FCC, RoHS, ISO 9001 |
| Warranty | 3 years standard, extendable to 5 years |
Optional add-on
WebAlarm™ cloud monitoring
Our optional cloud-based monitoring platform provides real-time insights into your LANDLINE-4G devices, ensuring maximum uptime and peace of mind.
Real-time monitoring
Track the status and performance of all your LANDLINE-4G devices from a single dashboard, with detailed metrics on signal strength, battery status, and connection quality.
Instant alerts
Receive immediate notifications via email, SMS, or push notifications when any issues are detected, allowing for proactive maintenance before critical failures occur.
Comprehensive reporting
Generate detailed reports on device performance, uptime statistics, and historical data to help optimise your communication infrastructure.
Remote management
Configure and update your devices remotely, perform diagnostics, and troubleshoot issues without the need for on-site visits, saving time and resources.
Ready to upgrade?
Say goodbye to PSTN before it’s too late.
Modernise your critical systems with our reliable, digital landline alternatives. Whether it’s for lift phones, alarm panels, or intercoms—we’ve got your upgrade covered.
Schedule a personalised consultation with our remote monitoring experts to discuss your specific needs and discover the perfect solution for your business. Here's what to expect:
Initial discussion
We'll discuss your current setup, challenges, and specific monitoring requirements to understand your needs better.
Solution overview
Our expert will demonstrate relevant features and explain how our solutions can address your specific challenges.
Implementation plan
We'll outline a clear roadmap for implementing the solution, including timeline and integration process.
Frequently asked questions
Find answers to common questions about LANDLINE-4G solutions.
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The PSTN switch-off is scheduled for December 2025 in the UK, with many exchanges already being phased out. Different countries have different timelines, but most developed nations are in the process of decommissioning their PSTN networks in favor of digital alternatives.
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Yes, LANDLINE-4G is designed to be universally compatible with any system that currently uses a standard PSTN connection. It features standard RJ11 connectors that plug directly into your existing equipment without requiring any modifications or additional adapters.
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LANDLINE-4G includes an integrated battery backup system that provides up to 24 hours of continuous operation during power outages. This ensures that critical communications remain available even when mains power is unavailable, similar to how traditional PSTN lines operated independently of power.
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LANDLINE-4G utilizes multi-network SIM technology that automatically connects to the strongest available network with seamless failover between multiple carriers. This redundancy actually provides greater reliability than traditional PSTN lines, which were vulnerable to physical line damage. Our solutions typically achieve 99.99% uptime.
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No, WebAlarm is an optional add-on service. LANDLINE-4G devices function perfectly without it. However, WebAlarm provides valuable real-time monitoring, alerts, and management capabilities that many customers find essential for mission-critical applications. It's available as a monthly subscription service with different tiers based on your needs.