I've proposed Free Real-Time Communication as a topic in Outreachy this year. The topic will also be promoted as part of GSoC 2017.
If you are interested in helping as either an intern or mentor, please follow the instructions there to make contact.
Even if you can't participate, if you have the opportunity to promote the topic in a university or any other environment where potential interns will see it, please do so as this makes a big difference to the success of these programs.
The project could involve anything related to SIP, XMPP, WebRTC or peer-to-peer real-time communication, as long as it emphasizes a specific feature or benefit for the Debian community. If other Outreachy organizations would also like to have a Free RTC project for their community, then this could also be jointly mentored.