The register
Ribbon Communications UK Ltd, Maidenhead, Berks, holds a Home Office sponsor licence covering 2 routes: Global Business Mobility: Senior or Specialist Worker and Skilled Worker. It has been on the register since at least 2026. Its rating on the register is Worker (A rating).
Companies House lists it as Ribbon Communications UK Limited, number 04992536, incorporated 2003: 22 years of filings behind the name. Registered office: Bray House, Westacott Way, Maidenhead, Berkshire, SL6 3QH, SL6 3QH. By its SIC codes the business is in it, software and media. It has traded under other names before, including Genband Telecommunications (UK) Limited, Nextpoint Networks Limited.
A licence says an organisation may sponsor; it does not say it is hiring today. The way to find out is the same as for any employer: the careers page, the job boards, and a direct approach with a UK-style CV that says early that sponsorship would be needed.