OpenBSC » History » Revision 3
Revision 2 (laforge, 02/19/2016 10:47 PM) → Revision 3/45 (laforge, 02/19/2016 10:47 PM)
'''OpenBSC''' is the current name for a software program that started with the name bs11-abis.
== What is OpenBSC ==
It is a [wiki:BSC] (Base Station Controller) side implementation of the A-bis protocol, as implemented in the GSM Technical Specification 08.5x and 12.21. It implements a minimal subset of the [wiki:BSC], [wiki:MSC] and [wiki:HLR]. It does not implement ant of the interfaces (like the A and B interfaces) between the higher-order GSM network components.
The goal of the project is to
* provide a basis for experimentation and security research with GSM from the network side
* document, publicized and point out any security related issues that we find as part of that
* learn more about GSM networks on a lower level, particularly the practical aspects with real-world equipment
We '''are not interested''' in
* building a stable/reliable BSC/MSC for deployment in actual networks
* building something that follows the GSM spec to the last detail
* disrupting actual commercial GSM network
== Requirements ==
OpenBSC runs only on Linux systems and requires a [wiki:E1] interface card compatible with [wiki:mISDN]
It requires a GSM [wiki:BTS]. The only currently tested configuration is with a Siemens [wiki:BS-11] microBTS.
== Source code ==
You can check out the source code via
{{{
svn checkout http://bs11-abis.gnumonks.org/svn/trunk/openbsc
}}}
or browse it at http://bs11-abis.gnumonks.org/trac/browser
== Mailing list ==
There's a developer mailing list called openbsc@lists.gnumonks.org
Subscription is available at [http://lists.gnumonks.org/mailman/listinfo/openbsc/]
== Project status ==
=== Things that work ===
* [wiki:OML] Initialization of the BTS
* [wiki:RSL] bringup, channel allocation, Channel required / Immediate Assign
* Very simplistic [wiki:HLR] implemented as sqlite database
* Non-secure Authentication using [wiki:IMEI]/[wiki:IMSI] and regular SIM cards.
* [wiki:IMEI]/[wiki:IMSI] skimming of all phones that try to register with OpenBSC
* [wiki:SMS] reception and [wiki:SMS] sending (simplistic, not possible to route them yet)
* Transmission of MM INFO packets with operator name and local time / timezone
* Extremely simplistic call control for MO (Mobile Originated) calls
* TCH/F support.
=== Things that are implemented but don't work ===
* unfinished support for multiple [wiki:TRX] in one [wiki:BTS]
* paging group calculation
=== Things that are missing ===
* Cell Broadcast
* processing/switching of calls from one phone to another
* demultiplex of the four 16k sub-channels with voice data contained in one [wiki:E1] timeslot
* transcoding of voice data
* TCH/H voice calls
* [wiki:CSD] calls
* handover between multiple [wiki:BTS]
* emergency call handling
* Discontinuous TX and RX ([wiki:DTX] / [wiki:DRX]) support
== Authors ==
OpenBSC was mainly developed by [http://laforge.gnumonks.org/ Harald Welte]. Contributions by Holger Freyther, Stefan Schmidt, Daniel Willmann, Jan Luebbe and Thomas Seiler.
Thanks to Dieter Spaar for his [wiki:BS11-Init], without which we would not have been able to make progress as quickly as we did.
