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Osmocom Mobile Switching Centre
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Neels Hofmeyr ae98b97382 implement CM Re-Establish for voice calls 
Related: SYS#5130
Change-Id: I6fa37d6ca9fcb1637742b40e37b68d67664c9b60
 		2021-07-29 22:40:59 +02:00
contrib contrib/osmo-msc.spec.in: depend on dbd-sqlite3 2021-03-09 14:48:59 +01:00
debian Bump version: 1.6.1.98-cad22-dirty → 1.7.0 2021-02-23 20:22:34 +01:00
doc add sequence_charts/call_reestablishment.msc 2021-07-28 18:37:48 +02:00
include implement CM Re-Establish for voice calls 2021-07-29 22:40:59 +02:00
m4 move openbsc/* to repos root 2017-07-12 23:17:10 +00:00
src implement CM Re-Establish for voice calls 2021-07-29 22:40:59 +02:00
tests msc_a.c: Allow MSC_A_EV_CN_CLOSE in state MSC_A_ST_RELEASING 2021-07-12 16:37:24 +02:00
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Makefile.am manuals: generate vty reference xml at build time 2020-07-12 12:30:28 +00:00
README README update. Explain more what it is than just the history 2021-01-06 13:13:46 +01:00
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TODO-RELEASE support A5/4 in inter-BSC handover 2021-06-24 01:44:17 +02:00
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osmoappdesc.py osmoappdesc.py, tests: switch to python 3 2019-12-12 09:29:19 +00:00

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