This repository contains a C-language implementation of a Serving GPRS Support Node (SGSN) for 2.5/2.75G (GPRS/EDGE) and 3G (UMTS). It is part of the Osmocom 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

You can find the OsmoSGSN homepage online at https://osmocom.org/projects/osmosgsn/wiki.

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

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

We welcome any osmo-sgsn related discussions in the Cellular Network Infratructure -> 2G/3G Core Network. section of the osmocom discourse (web based Forum).

Discussions related to osmo-sgsn are happening on the [email protected] 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 when posting.

We use the issue tracker of the osmo-sgsn project on osmocom.org for tracking the state of bug reports and feature requests. Feel free to submit any issues you may find, or help us out by resolving existing issues.

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

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.