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

Updated by laforge 21 days ago ยท 28 revisions

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