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The objective of this paper is to show the implementation experience of a GSM Base Transceiver System (BTS) by using Universal Software Radio Peripheral, which is a multi-purpose motherboard for Software Defined Radio (SDR), and a Personal Computer (PC). The OpenBTS project provides a software suite, created for the GNU Radio environment, and able to mimic the behavior of a GSM BTS. In order to allow GSM users to make calls and send text messages, it is necessary to operate some hardware modifications on the SDR motherboard, to set up a Session Initiation Protocol (SIP) server, to configure the server for providing connectivity between the mobile devices and the VoIP backhaul.
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