The text discusses server-side VoIP software like FreeSWITCH, Kamailio / OpenSIPS, and Yate, which each have unique configurations, resource needs, capabilities, and goals. It highlights the challenges of testing these applications in a production environment and emphasizes the importance of maintaining consistent configurations. Docker is introduced as an open-source container virtualization platform that can help address these issues by creating isolated environments for applications. The benefits of using Docker include speed, repeatability, packaging, scalability, and enabling innovation in telecommunications.