Open BTS
OpenBTS (Open Base Transceiver Station) is a software-based GSM access point, allowing standard GSM-compatible mobile phones to be used as SIP endpoints in Voice over IP (VOIP) networks. The public release of OpenBTS is notable for being the first free software implementation of the lower three layers of the industry-standard GSM protocol stack. It is written in C++ and released as free software under the terms of version 3 of the GNU Affero General Public License (AGPL).
Read more about Open BTS: Open GSM Infrastructure, History, Platforms, Security, Field Tests, See Also
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