osmo-msc

Osmocom Mobile Switching Centre

Go to file

Pau Espin 017ba1fa30 vlr_sgs: Balance use_count incremented in vlr_sgs_loc_update During a recent pcap trace, it was spotted that subscriber coming from SGs had a use count with 16 "SGs" items, and later it incremented to 17. Further investigation shows that the related use_count item was never decreased, meaning every time an SGs-LU was sent by the MME, the item was incremented further and never decremented. Let's rename the item to be referenced while in LU, and then decremented when LU is done. At that time, either the LU was accepted and the subscriber object has a use_count item "attached", or it was rejected and we already sent the reject messages, so we are fine deleting it if needed. Related: SYS#5337 Change-Id: I22c386f02ffa57428f700b003cc2cf23133598d0		2021-08-24 14:59:27 +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	running.adoc: add section about MGCP configuration	2021-08-03 11:36:25 +02:00
include	vlr_sgs: Balance use_count incremented in vlr_sgs_loc_update	2021-08-24 14:59:27 +02:00
m4	move openbsc/* to repos root	2017-07-12 23:17:10 +00:00
src	vlr_sgs: Balance use_count incremented in vlr_sgs_loc_update	2021-08-24 14:59:27 +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
.gitignore	.gitignore: Ignore new autofoo tmp files	2021-02-04 12:51:41 +01:00
.gitreview	update .gitreview to new repo url	2017-08-08 17:26:28 +02:00
.mailmap	add .mailmap file for mapping git author name/mail in shortlog	2016-08-08 17:40:28 +00:00
AUTHORS	move openbsc/* to repos root	2017-07-12 23:17:10 +00:00
COPYING	move openbsc/* to repos root	2017-07-12 23:17:10 +00:00
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
README.vty-tests	Remove obsolete ./configure option	2017-11-29 14:24:54 +00:00
TODO-RELEASE	support A5/4 in inter-BSC handover	2021-06-24 01:44:17 +02:00
configure.ac	configure.ac: Depend on newer libosmo-ranap	2021-02-23 20:47:57 +01:00
git-version-gen	git-version-gen: Don't check for .git directory	2018-07-24 18:05:46 +02:00
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