library implementing the GTP protocol between SGSN and GGSN

 OsmoGGSN 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.
 .
 This library is part of OsmoGGSN and implements the GTP protocol between
 SGSN (Serving GPRS support node) and GGSN.