osmo-sgssn - Osmocom SGSN Implementation
========================================

This repository contains a C-language implementation of a GSM Serving GPRS
Support Node (SGSN) for 2G (GSM) and 3G (UMTS).  It is part of the
[Osmocom](https://osmocom.org/) Open Source Mobile Communications
project.

OsmoSGSN exposes
 * Gb towards PCUs (e.g. OsmoPCU): Various GbIP flavors + Gb/FR/E1
 * GTP towards a GGSN (e.g. OsmoGGSN);
 * IuPS over IP towards RNCs / HNBGW (e.g. osmo-hnbgw)
 * The Osmocom typical telnet VTY and CTRL interfaces.
 * The Osmocom typical statsd exporter.
 * GSUP (custom MAP-like protocol) towards osmo-hlr

OsmoSGSN implements
 * GPRS mobility management
 * GPRS session management

Homepage
--------

You can find the OsmoSGSN issue tracker and wiki online at
<https://osmocom.org/projects/osmosgsn> and <https://osmocom.org/projects/osmosgsn/wiki>.


GIT Repository
--------------

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

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

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


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](https://ftp.osmocom.org/docs/latest/osmosgsn-usermanual.pdf)
as well as the [VTY Reference Manual](https://ftp.osmocom.org/docs/latest/osmosgsn-vty-reference.pdf)


Mailing List
------------

Discussions related to osmo-sgsn are happening on the
osmocom-net-gprs@lists.osmocom.org mailing list, please see
<https://lists.osmocom.org/postorius/lists/osmocom-net-gprs.lists.osmocom.org/> for subscription
options and the list archive.

Please observe the [Osmocom Mailing List
Rules](https://osmocom.org/projects/cellular-infrastructure/wiki/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-sgsn can be seen at
<https://gerrit.osmocom.org/#/q/project:osmo-sgsn+status:open>


History
-------

OsmoSGSN originated from the OpenBSC project, as a separate program within
openbsc.git. In 2017, OpenBSC was split in separate repositories, and hence
OsmoSGSN was given its own separate git repository.