--- title: PSTN Switch-off Planning | Resonate description: Resonate offers a fully managed SIP trunking and Teams Direct Routing service. --- - [Resources](https://migrateresources.resonate-ucc.com) - [Resellers](https://migration.resonate-ucc.com/resonate-resellers) - [Contact](https://migration.resonate-ucc.com/contact-us) - - - - Voice for Teams - Solutions - [Teams Direct Routing](https://migration.resonate-ucc.com/voice-for-teams-direct-routing) - [SIP Trunking](https://migration.resonate-ucc.com/sip-trunking) - [Teams Mobile](https://migration.resonate-ucc.com/teams-mobile) - [Contact Centre](https://migration.resonate-ucc.com/teams-contact-centre) - [Teams Phone Management](https://migration.resonate-ucc.com/crest-tooling-for-teams) - [SBC Management](https://migration.resonate-ucc.com/teams-sbc-management) - Services - [Automation, Analytics & AI](https://migration.resonate-ucc.com/custom-teams-solutions) - [Change & Adoption](https://migration.resonate-ucc.com/change-and-adoption) - [PSTN Switch-off Planning](https://migration.resonate-ucc.com/pstn-switch-off-planning) - [PBX Removal](https://migration.resonate-ucc.com/legacy-pbx-removal) - [Voice Consultancy](https://migration.resonate-ucc.com/voice-consultancy) - [Hybrid Working Support](https://migration.resonate-ucc.com/hybrid-working) - Meetings for Teams - Solutions - [Room Systems](https://migration.resonate-ucc.com/teams-room-systems) - [Video Interoperability](https://migration.resonate-ucc.com/video-interoperability) - [Live Events & CDN](https://migration.resonate-ucc.com/cdn-teams-live-events) - Power Platform - Solutions - [Power Platform Overview](https://migration.resonate-ucc.com/power-platform) - [Crest Voice Management](https://migration.resonate-ucc.com/crest-tooling-for-teams) - [Crest Voice Manager](https://migration.resonate-ucc.com/crest-voice-manager) - [Crest Voice Insights](https://migration.resonate-ucc.com/crest-voice-insights) - Services - [Bespoke App Development](https://migration.resonate-ucc.com/bespoke-app-development) - [Centre of Excellence Services](https://migration.resonate-ucc.com/centre-of-excellence-services) - About - Industries - [Energy](https://migration.resonate-ucc.com/energy-industry-specialism) - [Financial Services](https://migration.resonate-ucc.com/financial-services-industry-specialism) - [Retail](https://migration.resonate-ucc.com/retail-industry-specialism) - [Healthcare](https://migration.resonate-ucc.com/healthcare-energy-specialism) - [Legal Services](https://migration.resonate-ucc.com/legal-industry-specialism) - [Manufacturing](https://migration.resonate-ucc.com/manufacturing-industry-specialism) - Company - [Our Story](https://migration.resonate-ucc.com/resonate-about-us) - [Meet the team](https://migration.resonate-ucc.com/en/meet-the-team) - [Recruitment](https://migration.resonate-ucc.com/resonate-careers-and-vacancies) - [Case Studies](https://migration.resonate-ucc.com/resonate-case-studies) [Request A Call Back](http://go.resonate-ucc.com/request-a-callback) - Voice for Teams - Solutions - [Teams Direct Routing](https://migration.resonate-ucc.com/voice-for-teams-direct-routing) - [SIP Trunking](https://migration.resonate-ucc.com/sip-trunking) - [Teams Mobile](https://migration.resonate-ucc.com/teams-mobile) - [Contact Centre](https://migration.resonate-ucc.com/teams-contact-centre) - [Teams Phone Management](https://migration.resonate-ucc.com/crest-tooling-for-teams) - [SBC Management](https://migration.resonate-ucc.com/teams-sbc-management) - Services - [Automation, Analytics & AI](https://migration.resonate-ucc.com/custom-teams-solutions) - [Change & Adoption](https://migration.resonate-ucc.com/change-and-adoption) - [PSTN Switch-off Planning](https://migration.resonate-ucc.com/pstn-switch-off-planning) - [PBX Removal](https://migration.resonate-ucc.com/legacy-pbx-removal) - [Voice Consultancy](https://migration.resonate-ucc.com/voice-consultancy) - [Hybrid Working Support](https://migration.resonate-ucc.com/hybrid-working) - Meetings for Teams - Solutions - [Room Systems](https://migration.resonate-ucc.com/teams-room-systems) - [Video Interoperability](https://migration.resonate-ucc.com/video-interoperability) - [Live Events & CDN](https://migration.resonate-ucc.com/cdn-teams-live-events) - Power Platform - Solutions - [Power Platform Overview](https://migration.resonate-ucc.com/power-platform) - [Crest Voice Management](https://migration.resonate-ucc.com/crest-tooling-for-teams) - [Crest Voice Manager](https://migration.resonate-ucc.com/crest-voice-manager) - [Crest Voice Insights](https://migration.resonate-ucc.com/crest-voice-insights) - Services - [Bespoke App Development](https://migration.resonate-ucc.com/bespoke-app-development) - [Centre of Excellence Services](https://migration.resonate-ucc.com/centre-of-excellence-services) - About - Industries - [Energy](https://migration.resonate-ucc.com/energy-industry-specialism) - [Financial Services](https://migration.resonate-ucc.com/financial-services-industry-specialism) - [Retail](https://migration.resonate-ucc.com/retail-industry-specialism) - [Healthcare](https://migration.resonate-ucc.com/healthcare-energy-specialism) - [Legal Services](https://migration.resonate-ucc.com/legal-industry-specialism) - [Manufacturing](https://migration.resonate-ucc.com/manufacturing-industry-specialism) - Company - [Our Story](https://migration.resonate-ucc.com/resonate-about-us) - [Meet the team](https://migration.resonate-ucc.com/en/meet-the-team) - [Recruitment](https://migration.resonate-ucc.com/resonate-careers-and-vacancies) - [Case Studies](https://migration.resonate-ucc.com/resonate-case-studies) [SIP Trunking](https://migration.resonate-ucc.com/sip-trunking) [Direct Routing](https://migration.resonate-ucc.com/voice-for-teams-direct-routing) [Voice Tooling](https://migration.resonate-ucc.com/crest-tooling-for-teams) # PSTN Switch-off Planning [ASSESSMENT](http://go.resonate-ucc.com/isdn-pstn-switch-off-assessment) [FIND OUT MORE](https://migrateresources.resonate-ucc.com/an-introduction-to-the-isdn-pstn-switch-off) [BOOK A CALL](https://migration.resonate-ucc.com/contact-us) ![Untitled design - 2022-11-03T102017.713](https://7385976.fs1.hubspotusercontent-na1.net/hubfs/7385976/Untitled%20design%20-%202022-11-03T102017.713.png) ## Overview From late 2023, sales of new PSTN lines will cease and, in 2025, the UK PSTN network will be switched off. By then, all phone lines will need to have moved to a fully digital (IP) network. Like most deadlines, it will be here much faster than many expect. Resonate offers a fully managed SIP trunking and Teams Direct Routing service. We also have a team of expert solutions architects, who can help you move to, or integrate your legacy services with, Microsoft Teams.  #### Is your organisation still relying on legacy services? - Don’t fully understand your voice telephony estate, which might have built up over time and been managed on a site-by-site basis? - Can’t identify which legacy phone services you still use and whether they need to be migrated or integrated into a Teams solution? - Experiencing rising legacy phone bills  - Struggling to find a way to add or extend your service? [TAKE OUR READINESS ASSESSMENT](http://go.resonate-ucc.com/isdn-pstn-switch-off-assessment) ![AdobeStock_215936359](https://7385976.fs1.hubspotusercontent-na1.net/hubfs/7385976/AdobeStock_215936359.jpeg) #### Ensure voice continuity when switching to an IP-based solution Resonate has seamlessly migrated tens of thousands of users to fully cloud-based or hybrid solutions using Teams and Direct Routing. - You can BYO SIP or port your numbers to our  highly resistant, single-vendor SIP network - Our expert Solutions Architects have the knowledge to design migration and ‘interop’ solutions for the most complex of organisations - We offer a proven legacy estate mapping methodology ![AdobeStock_214243982](https://7385976.fs1.hubspotusercontent-na1.net/hubfs/7385976/AdobeStock_214243982.jpeg) ## A cost-effective and flexible alternative to legacy telephony built within Teams - With 270 million users and growing - Teams is the most popular business tool for on-net voice calling and collaboration - Resonate's solutions will work with any unmovable analogue technology -  Maintain your voice continuity - our voice experts will manage your end-to-end migration from current telephony solutions to our resilient fully managed service [Learn More](https://migration.resonate-ucc.com/voice-for-teams-direct-routing) [Talk to Us](https://migration.resonate-ucc.com/contact-us) ### Case Study: Top 5 Global Energy Giant This multi-national needed to reduce infrastructure complexity and cost while providing tools to enable flexible working, encourage collaboration and exploit innovation. - 90,000 desk phones were removed - 200 legacy PBXs removed too - 60% cost savings after successful rollout ![pexels-george-milton-7014599](https://7385976.fs1.hubspotusercontent-na1.net/hubfs/7385976/pexels-george-milton-7014599.jpg) ## Resources Get the latest information on Microsoft Teams, Power Platform and the world of UCC in our resources area [![](https://7385976.fs1.hubspotusercontent-na1.net/hubfs/7385976/Untitled%20design%20-%202024-06-27T144856.783.png)](https://migrateresources.resonate-ucc.com/empowering-frontline-and-on-the-move-workers-with-microsoft-technology) Empowering Frontline and On-Th ... Frontline workers and on-the-move employees are a cornerstone of the economy. These team members make up around 80% of the global workforce. Yet many still feel they don’t hav ... [READ MORE](https://migrateresources.resonate-ucc.com/empowering-frontline-and-on-the-move-workers-with-microsoft-technology) [![](https://7385976.fs1.hubspotusercontent-na1.net/hubfs/7385976/AdobeStock_313319277-2-1.jpeg)](https://migrateresources.resonate-ucc.com/a-message-from-our-ceo) A message from our CEO Today, we are sharing some incredibly exciting news. [READ MORE](https://migrateresources.resonate-ucc.com/a-message-from-our-ceo) [![](https://7385976.fs1.hubspotusercontent-na1.net/hubfs/7385976/Untitled%20design%20-%202024-02-20T143803.919-1.png)](https://migrateresources.resonate-ucc.com/press-release-resonate-is-now-an-scc-business) Press Release - Resonate is no ... SCC Strengthens its Microsoft and Unified Communications and Collaboration Portfolio with Acquisition of Resonate [READ MORE](https://migrateresources.resonate-ucc.com/press-release-resonate-is-now-an-scc-business) #### Working Smarter with Microsoft Your trusted partner on your Microsoft journey. #### Follow Us #### Useful Information - [Contact](https://migration.resonate-ucc.com/contact-us) - [About](https://migration.resonate-ucc.com/resonate-about-us) - [Resources](https://migrateresources.resonate-ucc.com) - [More about SCC](https://www.scc.com/) ![Resonate Footer Badges (2)](https://migration.resonate-ucc.com/hubfs/Resonate%20Footer%20Badges%20(2).png) #### Sign up to our Newsletter #### Contact Us E:  [info@resonate-ucc.com](mailto:info@resonate-ucc.com) UK T:  [+44 (0) 20 7898 9958](tel:+44%20(0)%2020%207898%209958) US T:  [+1 302 268 6258](tel:+1%20302%20268%206258) Slovakia T:  [+421 55230 19 58](tel:+421%2055230%2019%2058) Benelux T:  [+31 10 899 5258](tel:+31%2010%20899%205258) - [Terms & Conditions](https://migration.resonate-ucc.com/terms-and-conditions) - [Privacy Policy](https://migration.resonate-ucc.com/privacy-policy) - [Cookies](https://migration.resonate-ucc.com/cookies) ©2026 Resonate UCC. 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