I’ve been working on a peer to peer call routing system for the past four and some odd years. I gained interest in this when I worked at the now Google owned Gizmo5. I’ve been working with the p2psip WG on the RELOAD base protocol draft where many ideas blend. My p2p and voip background are now collectively one. I’ve completed a peer to peer telephony system(like Skype) with presence, data transfers and call routing. It is 100% cross platform C++ and running on Mac OS X, Windows, Linux and iPhone OS. I don’t plan to unveil this for several months but here are some old screenshots of the test system in use.
This system requires only a single server to install a working infrastructure while being autonomous, distributed, load balanced and redundant.