OpenBTS is an implementation of the GSM air interface (Um) that allows cellular handsets to be used directly as SIP endpoints. It uses the USRP for its radio interface and Asterisk or FreeSWITCH as its network interface.
It is an important step
great soft, ideal choice for understanding GSM!
this will help deploy DIY GSM antennas in developing countries
great tool for understanding GSM networks
Has cleared the GSM telephonic concept in a precise manner ...THANKS
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