Callisto Communications is a St. Louis-based provider of telecommunications, audio/visual, and video conferencing solutions. With our national reach and diverse experience, Callisto assists clients in numerous vertical markets by lowering costs, envisioning and achieving goals, and reducing stress points in the evolving and merging technologies of voice and data. In addition to TDM and VoIP, Callisto's competencies include new technologies in SIP and UC, as well as VC, AV, wireless, and core data solutions.