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 onre 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

OsmoSGSN packages are created as part of the Osmocom nightly Debian/Ubuntu builds, see NightlyBuilds


TODO list

For details see the Issue tracker above. Roughtly, 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