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?

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

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

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


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