Extending VoIP to the GSM Air Interface

OpenBTS is an open-source system that allows ordinary GSM handsets to be used as SIP or IAX clients.  The project's goal is to enable a new type of hybrid cellular telephony for greenfield deployments in the developing world, using the GSM air interface as the "last mile" in rural VoIP networks.  In this talk, project co-founder David Burgess will describe some of the ideas that came together to inspire this project and will outline the project's approach to mapping GSM services to IP-based protocols using open-source applications like Asterisk, MySQL and Kannel.