Chicago's top-managed IT services company. Since 2004, CTI has been the goto organization for IT services and IT support throughout the Chicago region. We service all the collar counties from our home base in Elgin, IL. CTI Technology provides outsourced IT Services and IT support to organizations throughout the Chicagoland region. Think of CTI as your outsourced IT department for your Chicago business. As your trusted Chicago IT services company, we can support all your business IT support and IT service needs.