Osmocom Mobile Switching Centre
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Neels Hofmeyr 06c9ca4927 codecs: for IuUP, use AMR for codec matching
For finding usable codecs / matching codecs with remote call leg, use
AMR in place of IUFP.

On Iu, to the MGW we need to set the codec VND.3GPP.IUFP on the RAN
facing side. On the CN facing side, we indicate AMR instead, so that the
MGW decapsulates the IuUP into plain AMR RTP.

Related: SYS#5092
Change-Id: I752505dd8e2360665417cdba6a93cfa1490e4b70
2022-09-23 19:01:09 +02:00
contrib Set working directory in systemd service file 2022-08-30 19:37:20 +07:00
debian Bump version: 1.8.0.43-2eaaf-dirty → 1.9.0 2022-06-29 11:32:12 +02:00
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include HO Req: include IE Codec List (MSC Preferred) 2022-09-23 19:01:09 +02:00
m4 Drop unneeded ax_check_compile_flag.m4 2022-01-11 18:11:41 +01:00
src codecs: for IuUP, use AMR for codec matching 2022-09-23 19:01:09 +02:00
tests log chosen codec upon Assignment Complete 2022-09-23 19:01:09 +02:00
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README.md

osmo-msc - Osmocom MSC Implementation

This repository contains a C-language implementation of a GSM Mobile Switching Centre (MSC) for 2G (GSM) and 3G (UMTS). It is part of the Osmocom Open Source Mobile Communications project.

OsmoMSC exposes

  • A over IP towards BSCs (e.g. OsmoBSC): 3GPP AoIP or SCCPlite
  • IuCS over IP towards RNCs / HNBGW (e.g. osmo-hnbgw)
  • The Osmocom typical telnet VTY and CTRL interfaces.
  • The Osmocom typical statsd exporter.

OsmoMSC implements

  • 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)

Homepage

You can find the OsmoMSC issue tracker and wiki online at https://osmocom.org/projects/osmomsc and https://osmocom.org/projects/osmomsc/wiki.

GIT Repository

You can clone from the official osmo-msc.git repository using

    git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-msc

There is a web interface at https://gitea.osmocom.org/cellular-infrastructure/osmo-msc

Documentation

User Manuals and VTY reference manuals are [optionally] built in PDF form as part of the build process.

Pre-rendered PDF version of the current "master" can be found at User Manual as well as the VTY Reference Manual

Mailing List

Discussions related to osmo-msc are happening on the openbsc@lists.osmocom.org mailing list, please see https://lists.osmocom.org/mailman/listinfo/openbsc for subscription options and the list archive.

Please observe the Osmocom Mailing List Rules when posting.

Contributing

Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards

We us a gerrit based patch submission/review process for managing contributions. Please see https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for more details

The current patch queue for osmo-msc can be seen at https://gerrit.osmocom.org/#/q/project:osmo-msc+status:open

History

OsmoMSC originated from the OsmoNITB project, which started as a minimalistic all-in-one implementation of the GSM Network. In 2017, OsmoNITB 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.