Harald Welte, has written on his blog about operating an Open Source GSM network at the recent HAR2009 conference. Photographs and a description and of the setup, run under license of the Dutch regulatory authority, are provided; essentially the setup consisted of a pair of BTS’ (Base Transceiver Stations) running at 100mW transmit power each and tied to a tree. In turn these provided access to the Base Station Controller (BSC), in this case a Linux server in a tent running OpenBSC. The system authenticated users with a token sent via SMS; in total 391 users subscribed to the service and were able to use their phones as if they were on any other network. Independent researchers are increasingly examining GSM networks and equipment, Welte’s work proves that GSM is in the realm of the hackers now and that this realm of mobile networking could be set for a few surprises in the future.
"Regret is the worst of human emotions. There is no going back with regret. There is no future with regret. Regret is not something I live with. If there is something I wished I hadn't done, I don't do it anymore or I forgive myself and try better. My life is my statement and I try to be true to myself and thusly to other people. Whatever my failings are, they are human and I try to perfect it each day." William Shatner