--- title: "PSTN Migration for Alarm Systems | SPS Technical" description: "Prepare for the PSTN switch-off. 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[Home](/) 2. [Services](/services) 3. [Intruder Alarms](/services/intruder-alarms) 4. Pstn Migration [Back to intruder alarm systems](/services/intruder-alarms) PSTN Switch-Off — Action Required # PSTN Switch-Off — Is Your Intruder Alarm Still Monitoring? Analogue telephone lines are being disconnected across the UK. Intruder alarms relying on PSTN signalling are losing their ARC connection — and their police response. [Installation](/services/intruder-alarms/installation)[Maintenance](/services/intruder-alarms/maintenance)[PSTN migration](/services/intruder-alarms/pstn-migration)[Monitoring](/services/intruder-alarms/monitoring) Openreach's analogue PSTN telephone network is being switched off across the UK — and any intruder alarm using a phone line to signal an Alarm Receiving Centre is at risk of losing its monitoring path. Over 51% of UK exchanges have already stopped new PSTN connections. When the line goes, the alarm still sounds locally, but no signal reaches the ARC, no keyholder is contacted and no police response is dispatched. Many businesses don't realise their monitoring has been affected until after an incident. SPS Technical audits existing signalling paths and migrates systems to IP or 4G dual-path signalling across Yorkshire, Lincolnshire and the Humber. The problem Openreach's switch-off of the analogue PSTN telephone network is already underway, with over 51% of UK exchanges now stopped for new PSTN connections. When the line goes, any intruder alarm using it to signal an Alarm Receiving Centre loses its monitoring path. The alarm still sounds locally — but no signal reaches the ARC, no keyholder is contacted, and no police response is dispatched. Many businesses don't know their signalling path has been affected until after an incident. ## What Happens When Your PSTN Signalling Path Fails The PSTN switch-off is not a sudden event — it happens exchange by exchange, and many businesses only discover their monitoring has been affected when something goes wrong. The sequence of consequences is predictable and serious. The PSTN switch-off Is your alarm still monitoring? Openreach's analogue telephone network switch-off is already underway. Any intruder alarm using a phone line to signal an Alarm Receiving Centre follows this path. 01 PSTN line disconnected by Openreach 02 Alarm signal path fails silently 03 ARC receives no signal on activation 04 No keyholder contacted 05 No police response dispatched 51%+ UK exchanges already on stop-sell 2027 Full PSTN switch-off deadline IP/4G Dual-path replacement standard **SPS Technical audits existing signalling paths and migrates systems to IP or 4G dual-path signalling** — maintaining police response and ARC compliance throughout the migration. Risk indicators ## How to Tell If Your System Is at Risk If your intruder alarm uses a BT or analogue telephone line to contact your monitoring centre, or if your alarm panel has a built-in dialler rather than an IP or 4G communicator, your signalling path is at risk. SPS Technical can audit your existing setup and confirm whether a migration is needed. Your intruder alarm uses a BT or analogue phone line to contact the monitoring centre Your alarm panel has a built-in dialler rather than an IP or 4G communicator Your maintenance contract hasn't been reviewed for signalling compliance recently You've recently had phone line issues and your monitoring centre didn't alert you Your premises are in one of the 51%+ of exchanges already on the stop-sell list The solution ## How the Migration Works In most cases, migration to IP or 4G dual-path signalling does not require replacing the entire alarm system. A new communicator is fitted to the existing panel, tested and registered with the ARC. The process is straightforward and causes minimal disruption to your monitoring coverage during the transition. 1 Signalling audit We identify your current transmission path and check exchange status 2 Communicator selection IP, 4G or dual-path communicator specified to EN50136 3 Installation New communicator fitted to existing panel in most cases — no full system replacement needed 4 ARC reconnection Monitoring restored and dual-path signalling confirmed 5 Compliance verification EN50136 certificate issued, police URN status confirmed 1 Signalling audit We identify your current transmission path and check exchange status 2 Communicator selection IP, 4G or dual-path communicator specified to EN50136 3 Installation New communicator fitted to existing panel in most cases — no full system replacement needed 4 ARC reconnection Monitoring restored and dual-path signalling confirmed 5 Compliance verification EN50136 certificate issued, police URN status confirmed No full system replacement in most cases ARC monitoring maintained throughout EN50136 compliant on completion Police URN status preserved Free Tool ### PSTN Switch-Off Risk Checker Enter your postcode and current signalling type to get an initial indication of your alarm signalling risk from the PSTN switch-off. No account needed — results in under 2 minutes. Takes 2 minutes — no account needed. Results are indicative only. [Use This Tool](/tools/pstn-checker) Knowledge Centre ## Related Technical Guides [View all guides](/news) [ ![SPS Technical engineer diagnosing a commercial intruder alarm fault](https://media.base44.com/images/public/6989f2350e53aab8836435e3/f7993aae0_generated_image.png) Technical Guide ### Emergency Intruder Alarm Repair and Maintenance: A Business Guide A practical guide to commercial intruder alarm faults, emergency repair, planned maintenance, signalling issues, system takeovers and reducing security downtime. 24 Aug 2026 Read ](/news/emergency-intruder-alarm-repair-maintenance)[ ![Commercial intruder alarm system installed in a UK business premises](https://media.base44.com/images/public/6989f2350e53aab8836435e3/bb9358a60_generated_image.png) Technical Guide ### Commercial Intruder Alarm Systems: A Business & Facilities Manager's Guide A practical guide for business owners and facilities managers on choosing a commercial intruder alarm, including risk, Grades 2 and 3, monitoring, police response, SSAIB certification, integration and lifecycle maintenance. 24 Aug 2026 Read ](/news/commercial-intruder-alarm-systems-guide) [View all guides](/news) ### Request a signalling audit We'll check your current signalling path, assess your exchange status and advise on the migration options available. [Request a signalling audit](/?section=contact&type=pstn) ![SPS Technical](https://media.base44.com/images/public/6989f2350e53aab8836435e3/0ceea3d11_SPSTECHNICALLOGO.jpg) Commercial fire, CCTV, intruder alarm and access control systems — designed, installed, maintained and monitored across Yorkshire, Lincolnshire and the Humber. #### Services - [Fire Alarm Systems](/services/fire-alarms) - [CCTV Systems](/services/cctv) - [Intruder Alarm Systems](/services/intruder-alarms) - [Access Control Systems](/services/access-control) - [System Monitoring](/services/monitoring) - [Guarding & Patrols](/services/guarding-mobile-response-keyholding) - [Maintenance & Compliance](/services/maintenance) - [System Takeovers](/services/takeovers) - [All Services](/services) #### Company - [About SPS Technical](/about) - [Our Story](/about/our-story) - [How We Work](/about/how-we-work) - [Values & Ethos](/about/values-ethos) - [Accreditations & Compliance](/about/accreditations-compliance) - [Sustainability & Social Value](/about/sustainability-social-value) - [Careers](/careers) - [Contractor Support](/contractors) - [Guides](/resources) - [Tools & Resources](/tools) - [Locations & Coverage](/locations) - [Customer Feedback](/customer-feedback) #### Accreditations SSAIB BAFE ISO 9001 SafeContractor Constructionline © 2026 SPS Security Ltd. 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