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+Free Software for the GSM protocol side
+
+As we see an increased use of Free and Open Source Software (FOSS) in mobile
+devices, some of them with GSM or UMTS cellular network connection, this FOSS
+adoption exclusively happens on the "Application Processor" side. To the
+contrary, the GSM protocol stack on the 'digital baseband' CPU is typically
+treated like if it was the biggest invention since sliced bread, and a most
+valuable and proprietary one.
+
+In fact, the entire GSM and UMTS protocol are specified in public documents,
+available free of cost to anyone from the ETSI (European Telecommunications
+Standardization Institute) or the 3GPP.
+
+So there is no lacking information preventing any FOSS implementation of
+those protocols. It is merely the fact how the cellular industry is currently
+structured. It's an oligopol, with very few players in the market, and
+artificial entry barriers for anyone who would want to compete with any part
+of the stack.
+
+In 2007, the THC GSM project developed tools called gsm-tvoid, gssm and gsmsp
+as first humble attempts of an Open Source implementation of a GSM protocol
+analyzer, based on the USRP and gnuradio software defined radio (SDR) platform.
+
+In 2008, two independent Free Software projects for the GSM network side have
+been release: OpenBTS and OpenBSC.
+
+In 2009, Harald has been starting to work on the detailed hardware and software
+architecture of an open source GSM development board, capable of running both
+the MS (cellphone) and BTS (cell tower) side.
+
+This presentation will give an overview about the existing FOSS efforts on the GSM
+protocol side, their current status and future directions.
personal git repositories of Harald Welte. Your mileage may vary