This repository contains a C-language implementation of a GSM Mobile Switching Centre (MSC) for 2G (GSM) and 3G (UMTS). It is part of the Osmocom Open Source Mobile Communications project.
OsmoMSC exposes * A over IP towards BSCs (e.g. OsmoBSC): 3GPP AoIP or SCCPlite * IuCS over IP towards RNCs / HNBGW (e.g. osmo-hnbgw) * The Osmocom typical telnet VTY and CTRL interfaces. * The Osmocom typical statsd exporter.
OsmoMSC implements * mobility management * call control (either via built-in MNCC handler or external osmo-sip-connector) * USSD (exposed via GSUP) * SMS (either via built-in SMSC or external via GSUP)
You can clone from the official osmo-msc.git repository using
git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-msc
There is a web interface at https://gitea.osmocom.org/cellular-infrastructure/osmo-msc
User Manuals and VTY reference manuals are [optionally] built in PDF form as part of the build process.
Discussions related to osmo-msc are happening on the email@example.com 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.
Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards
We us 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-msc can be seen at https://gerrit.osmocom.org/#/q/project:osmo-msc+status:open
OsmoMSC originated from the OsmoNITB project, which started as a minimalistic all-in-one implementation of the GSM Network. In 2017, OsmoNITB 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.
OsmoMSC was one of the parts split off from the old openbsc.git.