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Osmocom Mobile Switching Centre
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Neels Hofmeyr dd04c7ecd9 CC: fix sanity expectations for call establishment 
Recent 'add full SDP codec information to the MNCC...' patch has added a strict
CC state sanity check, which is too strict:

In tests with 200 concurrent calls, situations came up where the MNCC is faster
than the Abis in establishing a call. If that happens, the CC state machine is
already in GSM_CSTATE_ACTIVE when the RR channel assignment completes.

Also allow GSM_CSTATE_ACTIVE state for accepting an Assignment Complete.

Change-Id: I0e0767ec10232615bbf063181fc7f8738ef94f28
 		2022-01-11 19:52:59 +01:00
contrib Bump version: 1.7.0.43-aefbf-dirty → 1.8.0 2021-11-16 17:44:54 +01:00
debian Bump version: 1.7.0.43-aefbf-dirty → 1.8.0 2021-11-16 17:44:54 +01:00
doc add full SDP codec information to the MNCC socket 2022-01-11 19:52:59 +01:00
include add full SDP codec information to the MNCC socket 2022-01-11 19:52:59 +01:00
m4 move openbsc/* to repos root 2017-07-12 23:17:10 +00:00
src CC: fix sanity expectations for call establishment 2022-01-11 19:52:59 +01:00
tests add full SDP codec information to the MNCC socket 2022-01-11 19:52:59 +01:00
.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 Announce IuFP audio codec for UTRAN conns in CRCX towards MGW 2022-01-05 13:58:15 +01:00
configure.ac Bump version: 1.7.0.43-aefbf-dirty → 1.8.0 2021-11-16 17:44:54 +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