Serving GPRS Support Node (SGSN). As such it implements the GPRS Mobility Management (GMM) and SM (Session Management).

The SGSN implements
  • the Gb interface to the BSS's (like the OsmoPCU or an ip.access nanoBTS)
  • the Gp interface with its GTP protocol to one or more Gateway GPRS Support Node (GGSN) like OsmoGGSN.
  • the IuPS interface with its RANAP protocol to one or more RNCs or HNB-GWs like OsmoHNBGW
  • the GSUP Interface/Protocol towards OsmoHLR

OsmoSGSN is available from the repository. In order to build it, you will need a libgtp installation from the OsmoGGSN project.

Position in a typical Osmocom network

For a more complete graph, see Osmocom Network In The Box

Setup / Configuration

For more information regarding the setup + configuration, refer to OpenBSC_GPRS

Binary Packages

Osmocom provides binary packages for several flavors of Debian and Ubuntu GNU/Linux on a variety of architectures (i586, x86_64, armhf, armv7l). Unless you are a software developer interested in developing on Osmocom, it is recommended you use those packages instead of building from source.

For more details see Binary_Packages

User Manuals

Source code

The source code is available from (module osmo-sgsn).

Public read-only access is available via

git clone

You can browse it via gitea:

Contributions are welcome via Gerrit.

Test Suite

We have a TTCN-3 test suite as part of our Titan_TTCN3_Testsuites

Contact / Getting Help

Contact us via the osmocom-net-gprs mailing list, see Mailing Lists.

You can file issues (bugs / feature requests) using the redmine project you're currently viewing.

TODO list

For details see the Issue tracker above. Roughly, the following areas are in need of attention:

  • secondary PDP contexts
  • persistent storage of GMM and SM state
  • recovery from GGSN outages
  • SMS delivery via GPRS
  • network-initiated PDP context activation

Commercial Support

Commercial support as well as development, system integration and training services for this project are available from sysmocom

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