Osmocom Mobile Switching Centre
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Pau Espin 6710670cb1 Fill Last Used E-UTRAN PLMN Id when in CSFB
Since recently, osmo-bsc behaves strictly as per specs, meaning it will
only send the "Cell selection indicator after release of all TCH and SDCCH IE"
in RR Channel Release iff:
* "Last Used E-UTRAN PLMN Id" was received in the CommonID sent MSC->BSC
* "Last Used E-UTRAN PLMN Id" was received insider "old BSS to new BSS Information"
  in the HandoverRequest sent MSC->BSC.
On the other hand, CSFB_Indicator from ClearCommand MSC->BSC is nw
ignored and not taken into account.

Hence, let's update osmo-msc to also behave correctly by sending the
Last Used E-UTRAN PLMN ID at CommonID tx time to avoid regressions in
CSFB support when running against newer osmo-bsc.

Let's keep sending the CSFB Indicator in ClearCommand as we used too, in
order to keep compatibility with older BSCs (as per spec).

Related: SYS#5337
Change-Id: Ic5f175b179973d0a50d94f00e15f5a3e332605fc
2021-04-29 14:22:33 +02:00
contrib contrib/osmo-msc.spec.in: depend on dbd-sqlite3 2021-03-09 14:48:59 +01:00
debian Bump version: → 1.7.0 2021-02-23 20:22:34 +01:00
doc Support setting rt-prio and cpu-affinity mask through VTY 2020-08-20 08:44:20 +00:00
include Fill Last Used E-UTRAN PLMN Id when in CSFB 2021-04-29 14:22:33 +02:00
m4 move openbsc/* to repos root 2017-07-12 23:17:10 +00:00
src Fill Last Used E-UTRAN PLMN Id when in CSFB 2021-04-29 14:22:33 +02:00
tests tests: Replace deprecated API log_set_print_filename 2021-02-19 14:11:26 +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 Bump version: → 1.7.0 2021-02-23 20:22:34 +01:00
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


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