FRAFOS is a startup with offices in Berlin and Prague. We are a team of seasoned and young VoIP enthusiasts who have made significant contributions to the development of SIP session border controllers, WebRTC and VoIP open source platforms such as SEMS and JsSIP.

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The ABC platform is a revolutionary interpretation of what border control element should be. The supported session border control (SBC) as well as WebRTC gateway functionalities scale smoothly from a small enterprise to a carrier-grade solution. With the out of the box support for cloud deployments, rich audio processing capabilities and open interfaces, the ABC Platform provides operators with the needed intelligence for facing the challenges of an ever changing industry.


The communication industry is exciting and dynamic. Customer expectations keep changing and new applications continue to emerge. To overcome these challenges innovative VoIP infrastructure components are needed. These components must not only be cost effective and reliable but also open, cloud ready and easy to extend and integrate.