03.603GPPGeneral Packet Radio Service (GPRS)Release 1998Service descriptionStage 2TS
This example is basically the same as described in subclause "Data Routeing for an MS in its Home PLMN to and from an External PDN". When the GGSN receives the GTP PDU and decapsulates the PDP PDU, it detects that the destination address is also in the GPRS network. Then, the PDP PDU that is sent by one MS is treated the same way as the PDP PDU that is received from the external data network.
– In case of connection-oriented protocols (e.g., X.25) an additional DTE/DCE conversion may need to be performed in the GGSN.
Figure C.3: MS-to-MS Data Routeing via the Same GGSN