ATLANTA, May 15, 2019 / — Colo Atl, an American Tower company and the leading provider of carrier-neutral colocation, data center and interconnection services at 55 Marietta Street in Atlanta, announces today that CallTower, a global leader in delivering cloud-based enterprise-class unified communications and collaboration solutions, has selected Colo Atl for colocation and interconnection services. CallTower headquarters in South Jordan, UT…