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OpenBTS ( Open Base Transceiver Station) is a software-based access point, allowing standard GSM-compatible to be used as SIP endpoints in Voice over IP (VoIP) networks. OpenBTS is open-source software developed and maintained by . The public release of OpenBTS is notable for being the first implementation of the lower three layers of the industry-standard GSM . It is written in C++ and released as free software under the terms of version 3 of the GNU Affero General Public License.


Open GSM infrastructure
OpenBTS replaces the conventional GSM operator core network infrastructure from layer 3 upwards. Instead of relying on external base station controllers for radio resource management, OpenBTS units perform this function internally. Instead of forwarding call traffic through to an operator's mobile switching center, OpenBTS delivers calls via SIP to a VOIP soft switch (such as or yate) or PBX (such as ). This VOIP switch or PBX software can be installed on the same computer used to run OpenBTS itself, forming a self-contained cellular network in a single computer system. Multiple OpenBTS units can also share a common VOIP switch or PBX to form larger networks

The OpenBTS Um air interface uses a software-defined radio with no specialized GSM hardware. The original implementation used a USRP from Ettus Research, but has since been expanded to support several digital radios in implementations ranging from full-scale base stations to embedded .


History
The project was started by Harvind Samra and David A. BurgessBort, Julie. Burning Man's open source cell phone system could help save the world, Network World, August 30, 2010. Retrieved December 6, 2011. with the aim of the project to drastically reduce the cost of GSM service provision in rural areas, the developing world, and hard to reach locations such as oil rigs.Naone, Erica. Build Your Own Cellular Network, Technology World, May 2010. Retrieved on December 7, 2011. The project was initially conducted through Kestrel Signal Processing, the founders' consulting firm.

On September 14, 2010, at the Fall 2010 , the original authors launched as a start up company to commercialize OpenBTS-based products.Takahash, Dean DEMO: Range Networks rings in cell-phone service for $2 a month VentureBeat, September 14, 2010. Retrieved December 6, 2011.

In September 2013, Burgess left Range Networks and started a new venture called LegbaFinley, Klint Out in the Open: This super-cheap cellphone network brings coverage almost anywhere Wired, June 9, 2014. and started a close collaboration with Null Team SRL, the developers of Yate. In February 2014, Legba and Null announced the release of YateBTS, a fork of the OpenBTS project that uses Yate for its control layers and network interfaces.


Platforms
A large number of experimental installations have shown that OpenBTS can run on extremely low overhead platforms. These including some CDMA handsets - making a GSM gateway to a network. Computer security researcher Chris Paget reported Paget, Chris. OpenBTS on Droid, Chris Paget's Blog, February 19, 2010. Retrieved Dec. 6 2011. that a handheld device, such as an Android phone, could act as a gateway base station to which handsets can connect; the Android device then connects calls using an on-board server and routes them to the via SIP over an existing 3G network.


Security
At the 2010 conference, it was demonstrated with OpenBTS that GSM calls can be intercepted due to the fact that in GSM the handset does not authenticate the base station prior to accessing the network.Paget, Chris. Practical Cellphone Spying, DEF CON 18, July 30, 2010. Retrieved Dec. 6 2011.

OpenBTS has been used by the security research community to mount attacks on cellular phone baseband processors.Claburn, Thomas. Google Bets $20,000 You Can't Hack Chrome, Information Week, February 04, 2011. Retrieved December 6, 2011. Previously, investigating and conducting such attacks was considered impractical due of the high cost of traditional cellular base station equipment.


Field tests
Large scale live tests of OpenBTS have been conducted in the United States in Nevada and northern California using temporary radio licenses applied for through Kestrel Signal Processing and , Inc.


Burning Man
During the festival in August 2008, a week-long live field test was run under special temporary authorization license.Federal Communications Commission, WD9XKN Experimental Special Temporary Authorization, August 24, 2008. Retrieved December 6, 2011.Burgess, David. The OpenBTS Project - an open-source GSM base station LWN.net, September 4, 2008. Retrieved December 6, 2011. Although this test had not been intended to be open to Burning Man attendees in general, a number of individuals in the vicinity succeeded in making real out-going calls after a mis-configured Asterisk PBX installation allowed test calls prefixed with an international code through. The Unofficial Non-Carrier of Burning Man 2008 OpenBTS website. Retrieved December 6, 2011. The Burning man test successfully connected about 120 phone calls to 95 different numbers in area codes over North America.

At the 2009 Burning Man festival, a larger test setup was run using a 3-sector system.Burgess, David. OpenBTS Nevada Test Site Astricon 2009, October 13, 2009. Retrieved December 7, 2011. For the 2010 festival, an even larger 2-sector 3-carrier system was tested.

At the 2011 festival, the OpenBTS project set up a 3-site network with gateway and worked in conjunction with the Voice over IP services company to provide much of the off-site call routing.Burgess, David. Burning Man 2011 - Yes we were there The OpenBTS Chronicles, September 6, 2011. Retrieved on December 7, 2011.


"RELIEF" Exercises
RELIEF is a series of disaster response exercises managed by the Naval Postgraduate School in , USA. Range Networks operated OpenBTS test networks at the RELIEF exercises in November 2011 and February 2012.


Niue
During 2010, an OpenBTS system was installed on the island of and became the first installation to be connected and tested by a telecommunication company. Niue is a very small island country with a population of about 1,700 - too small to attract mobile telecommunications providers. The cost structure of OpenBTS suited Niue, which required a mobile phone service but did not have the volume of potential customers to justify buying and supporting a conventional GSM basestation system.Burgess, David. FAKALOFA LAHI ATU, The OpenBTS Chronicles, March 7, 2010. Retrieved on December 7, 2011.

The success of this installation and the demonstrated demand for service helped bootstrap later commercial services. The OpenBTS installation was later decommissioned ~February 2011 by Niue Telecom, a commercial grade GSM 900 network with Edge support was instead launched few months later (3x sites in Kaimiti O2, Sekena S2/2/2 and Avatele S2/2/2) this provided full coverage around the island and around the reef, the installation included a pre-pay system, USSD, Int. SMS and new Int. Gateway.


Defcon 20
From July 26 to July 29, 2012, the Ninja Networks team set up a "" in the Vendor area of Defcon 20 (at the Rio Hotel/Casino in Las Vegas.) It used OpenBTS and served a small network of 650 phones with custom SIM cards.


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