This repository contains a C-language implementation of a GSM Base Station Controller (BSC). It is part of the Osmocom Open Source Mobile Communications project.

OsmoBSC exposes

• A over IP towards an MSC (e.g. osmo-msc): 3GPP AoIP or SCCPlite
• Abis interfaces towards various kinds of BTS (e.g. osmo-bts, sysmobts, nanoBTS, Siemens, Nokia, Ericsson)
• The Osmocom typical telnet VTY and CTRL interfaces.
• The Osmocom typical statsd exporter.
• Cell Broadcast Service Protocol (CBSP) towards a CBC (Cell Broadcast Centre, such as osmo-cbc).
• Lb interface towards a SMLC (Serving Mobile Location Centre, such as osmo-smlc).

You can find the OsmoBSC homepage with issue tracker and wiki online at https://osmocom.org/projects/osmobsc/wiki.

You can clone from the official osmo-bsc.git repository using

    git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-bsc

There is a web interface at https://gitea.osmocom.org/cellular-infrastructure/osmo-bsc

User Manuals and VTY reference manuals are [optionally] built in PDF form as part of the build process.

Pre-rendered PDF version of the current "master" can be found at User Manual as well as the VTY Reference Manual

There also is an Abis reference Manual describing the OsmoBTS specific A-bis dialect, as well as a CBSP Reference Maunal describing the level of CBSP conformance.

We welcome any osmo-bsc related discussions in the Cellular Network Infrastructure -> 2G/3G RAN (GERAN) section of the osmocom discourse (web based Forum).

Discussions related to osmo-bsc are happening on the [email protected] mailing list, please see https://lists.osmocom.org/mailman/listinfo/openbsc for subscription options and the list archive.

Please observe the Osmocom Mailing List Rules when posting.

We use the issue tracker of the osmo-bsc project on osmocom.org for tracking the state of bug reports and feature requests. Feel free to submit any issues you may find, or help us out by resolving existing issues.

Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards

We use a Gerrit based patch submission/review process for managing contributions. Please see https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for more details

The current patch queue for osmo-bsc can be seen at https://gerrit.osmocom.org/#/q/project:osmo-bsc+status:open

OsmoBSC originated from the OpenBSC project, which started as a minimalistic all-in-one implementation of the GSM Network. In 2017, OpenBSC had reached maturity and diversity (including M3UA SIGTRAN and 3G support in the form of IuCS and IuPS interfaces) that naturally lead to a separation of the all-in-one approach to fully independent separate programs as in typical GSM networks.

OsmoBSC was one of the parts split off from the old openbsc.git. Before, it worked as a standalone osmo-bsc binary as well as a combination of libbsc and libmsc, i.e. the old OsmoNITB. Since the standalone OsmoMSC with a true A interface (and IuCS for 3G support) is available, OsmoBSC exists only as a separate standalone entity.