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As of 2025-03-10 (I0d58e6d84418f50670c8ab7cf8490af3bc2f5c26 merge) OsmoMGW supports an SDP extension that enables the use of TW-TS-001 and TW-TS-002 enhanced RTP formats for FR/EFR and HRv1, respectively; libosmo-mgcp-client likewise supports a mechanism to request these extensions. At the present time OsmoMGW rtpbridge endpoints don't do anything different when these extensions are enabled (they originate from OsmoBTS in this case), but for E1 Abis endpoints the new MGCP extension controls whether or not these MGW endpoints emit the enhanced RTP formats in question. Changes to OsmoBSC: 1) Allow TW-TS-001 and TW-TS-002 to be enabled on all E1 BTS - previously not allowed. 2) Whether E1-based or IP-based BTS are used, when RTP extensions have been enabled by CN request (BSSMAP IE of TW-TS-003), pass them to the MGW endpoint controlled by this BSC. The second change makes RTP extensions work on E1 BTS, and also paves the way for future OsmoMGW rtpbridge improvements where the MGW might do additional processing that needs to be disabled when TW-TS-* extensions are in use. Depends: osmo-mgw.git I0d58e6d84418f50670c8ab7cf8490af3bc2f5c26 Change-Id: Iaa6e4c56313f06b79852c06dcec686f21950e638
osmo-bsc - Osmocom BSC Implementation
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).
Homepage
You can find the OsmoBSC homepage with issue tracker and wiki online at https://osmocom.org/projects/osmobsc/wiki.
GIT Repository
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
Documentation
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.
Forum
We welcome any osmo-bsc related discussions in the Cellular Network Infrastructure -> 2G/3G RAN (GERAN) section of the osmocom discourse (web based Forum).
Mailing List
Discussions related to osmo-bsc are happening on the openbsc@lists.osmocom.org 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.
Issue Tracker
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.
Contributing
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
History
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.