osmo-msc

Osmocom Mobile Switching Centre

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Harald Welte d43c22ef65 switch from libdbi to lbsqlite3 The choice of libdbi was one of the biggest early mistakes in (back then) OpenBSC development. A database abstraction library that prevents you from using proper prepared statements. Let's finally abandon it and use sqlite3 directly, just like we do in osmo-hlr. I decided to remove the database migration code as it would be relatively cumbersome to port all of it to direct sqlite3 with prepared statements, and it is prone to introduction of all kinds of errors. Since we don't have a body of older database files and comprehensive migration tests, it is safer to not offer migration code of uncertain quality. The last schema revision (5) was introduced 5 years ago in 2017 (osmo-msc v1.1.0), so it is considered an exceptionally rare case. People can install osmo-msc 1.1.0 through 1.8.0 to upgrade to v5 before using this new 'direct sqlite3' version of osmo-msc. Change-Id: Ia334904289f92d014e7bd16b02b3b5817c12c790 Related: OS#5559, OS#5563, OS#5564		2022-05-17 14:04:44 +02:00
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README

About OsmoMSC
=============

OsmoMSC is an implementation of the 3GPP MSC (Mobile Switching Centre)
network element.  It implements the following core functionality within
the 2G (GSM) and 3G (UMTS) networks:

* 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)

Historically, OsmoMSC 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.

OsmoMSC was one of the parts split off from the old openbsc.git. Before,
it was the libmsc part of the old OsmoNITB. Since a true A interface and
IuCS for 3G support is available, OsmoMSC exists only as a separate
standalone entity.

OsmoMSC exposes
- GSUP towards OsmoHLR (or a MAP proxy);
- A over IP towards a BSC (e.g. OsmoBSC);
- IuCS towards an RNC or HNB-GW (e.g. OsmoHNBGW) for 3G voice;
- MNCC (Mobile Network Call Control derived from GSM TS 04.07);
- SMPP 3.4 (Short Message Peer-to-Peer);
- The Osmocom typical telnet VTY and CTRL interfaces.

Find OsmoMSC issue tracker and wiki online at
https://osmocom.org/projects/osmomsc
https://osmocom.org/projects/osmomsc/wiki