03.333G security3GPPLawful InterceptionStage 2TS
The following picture contains the reference configuration for the lawful interception for GPRS systems. The various entities and interfaces are described in more detail in the succeeding sections. Interception takes place within the SGSN. As a national option, the GGSN may be used for interception.
There is one Administration Function (ADMF) in the network. Together with the delivery functions it is used to hide from the SGSN and GGSN that there might be multiple activations by different Law Enforcement Agencies (LEAs) on the same target.
Figure B.1: Reference configuration for GPRS
The GSN (GPRS Support Node) can be SGSN or GGSN. The reference configuration is only a logical representation of the entities involved in lawful interception and does not mandate separate physical entities. This allows for higher levels of integration.