(Cross-posted from The Free Speech Zone)
“We make GSM look like a wireless access point. We make it that simple,” describes one of the project’s three founders, Glenn Edens.
The technology starts with the “they-said-it-couldn’t-be-done” open source software, OpenBTS. OpenBTS is built on Linux and distributed via the AGPLv3 license. When used with a software-defined radio such as the Universal Software Radio Peripheral (USRP), it presents a GSM air interface (“Um”) to any standard GSM cell phone, with no modification whatsoever required of the phone. It uses open source Asterisk VoIP software as the PBX to connect calls, though it can be used with other soft switches, too. (More stats in a minute that I promise will blow away your inner network engineer.)