There are many solutions available to build Real-Time Communications infrastructures. Some of them combine the incredible value of mature applications with active, responsive Open Source communities.
Here's a list of applications we recommend our customers to adopt, depending on their needs.
For more about VoIP, VoIP in the cloud, Kamailio, WebRTC, Docker, take a look at Giacomo Vacca's slideshare presentations.
Presentations and other material: