OsmoBSC is an implementation of a GSM BSC (Base Station Controller), i.e. it offers
  • an A-bis interface towards the BTSs
  • an A-over-IP (AoIP) interface towards an MSC (e.g. OsmoMSC).
  • an Media Gateway Control Protocol (MGCP) interface towards a MGW (e.g. OsmoMGW for handling the RTP user plane (voice call codec frames)

History / Naming / SCCPlite

Until 2017, we used to have an osmo-bsc part of the old openbsc.git repository which implemented a smaller sub-set of the BSC functionality with an SCCPLite based A interface. This legacy program is now called osmo-bsc-sccplite and continues to be available for legacy users. However, it is not actively developed anymore. SCCPlite protocol support has been re-introduced in the new osmo-bsc from osmo-bsc.git. Users should not use the obsolete and unmaintained osmo-bsc-sccplite anymore.

OsmoBSC in the Osmocom architecture

Signaling Plane only

Signaling + User (Media) Plane

BTS Support

OsmoBSC supports currently all BTSs running the OsmoBTS software (such as sysmoBTS), as well as ip.access nanoBTS devices. Other Abis/IP devices may be supported.

Support for legacy E1/T1 TDM based BTSs (like those supported by OsmoNITB is on the roadmap.

Binary Packages

Osmocom provides binary packages for several flavors of Debian and Ubuntu GNU/Linux on a variety of architectures (i586, x86_64, armhf, armv7l). Unless you are a software developer interested in developing on Osmocom, it is recommended you use those packages instead of building from source.

For more details see Binary_Packages

User Manuals

Source code

The source code is available from (module osmo-bsc).

Public read-only access is available via

git clone

You can browse it via gitea:

Contributions are welcome via Gerrit.

Test Suite

We have a TTCN-3 test suite as part of our Titan_TTCN3_Testsuites

Contact / Getting Help

Contact us via the openbsc@ mailing list, see Mailing Lists.

You can file issues (bugs / feature requests) using the redmine project you're currently viewing.

Authors / Credit

The old OsmoBSC-SCCPlite was created by Holger Freyther based on the earler OpenBSC/OsmoNITB code by Dieter Spaar, Harald Welte, Holger Freyther and contributors.

3GPP AoIP support was developed by sysmocom. Today, OsmoBSC is maintained by Harald Welte and his team at sysmocom.

Commercial Support

Commercial support as well as development, system integration and training services for this project are available from sysmocom

Updated by laforge 14 days ago ยท 22 revisions

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