BotBuilder-RealTimeMediaCalling extends the BotBuilder to enable bots to engage in Skype audio-video calling. It provides real-time, programmable access to the voice, video, and screen sharing streams of a Skype call. The bot is a direct participant in a Skype 1:1 call.
The docs on this page have a link to requirements. When clicked, it takes you back to the same page: https://github.com/Microsoft/BotBuilder-RealTimeMediaCalling