Vladislav Yurov is a professional IT manager with more than 20 years of experience. The work invested by the author in creating the book will be appreciated by IT specialists of medium and large companies (100 employees or more) interested in reducing costs within their organization .Elastix is based on the Asterisk telecommunications server. Asterisk is the most widespread and functional free VoIP server. The main convenience of choosing Elastix is ease of installation and use. All components of the platform are integrated, “out of the box” the user receives a ready-made platform that supports Unified Communications. Here is what the author writes about the idea of writing a book dedicated to this topic: “Due to the lack of structured information on the Internet on setting up and maintaining Elastix (how in Russian and in English), notes were made for our own needs and for employees servicing Elastix at Icraft. At some point, there were so many entries that there was very little left before a full-fledged book. When processing materials for the book, I tried to focus on the least covered features of the Elastix setup on the Internet, as well as simplify the description of the necessary settings as much as possible.”