Charterhouse Capital, a private equity firm, agreed to invest in Telio, a developer, installer and operator of communications and media systems for correctional facilities. Financial terms were not disclosed. “We are delighted to be partnering with Charterhouse as we embark on the next stage of Telio’s growth. Charterhouse will contribute significant international expansion and transaction expertise that will support the execution of our strategy. We are confident that Charterhouse is the right partner to help Telio become a global powerhouse in our chosen markets," Oliver Drews, Telio Chairman.