OpenGGSN is a Gateway GPRS Support Node (GGSN). It is used by mobile operators as the interface between the Internet and the rest of the mobile network infrastructure. The project also developed an SGSN emulator suitable GPRS core network testing.
OsmoSGSN is an Open Source implementation of a SGSN (Serving GPRS Support Node). It provides a 3GPP Gb/IP interface towards PCUs like OsmoPCU as well as a Gp (GTP) interface towards GGSNs like OsmoGGSN and a GSUP interface towards OsmoHLR.
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