The original 'GSM in a box': a single application that presents a GSM air interface on a USRP and routes calls/SMS over SIP/Asterisk, replacing the traditional RAN+core. A self-contained alternative to the Osmocom stack for fake-BTS / IMSI-catcher work; build via the RangeNetworks 'dev' environment.
Last functional commit upstream is from March 2017, with only a copyright-year commit in 2021 and build-fix PRs left unmerged. Osmocom's osmo-bts is actively maintained (last commit August 2026). See instead: OsmoBTS (Osmocom GSM stack). Source · checked 2026-09-28