TEC 2021: Allegion Presents Overtur, A Cloud-Based Collaboration Platform for Security Integrators May 7, 2021 | Home / May 7, 2021 rave-video / TEC 2021: Allegion Presents Overtur, A Cloud-Based Collaboration Platform for Security Integrators TEC 2021: Allegion Presents Overtur, A Cloud-Based Collaboration Platform for Security Integrators