scope:

The present document specifies Lawful Interception for an Access Provider that has access to layer 2 session information and that is not required to have layer 3 information. In this case, the focus of Lawful Interception (LI) for IP Network Access is on the portion of the network, commonly referred to as "layer 2 interception", that facilitates subscriber access to the Public IP network.

The present document describes the LI at the interception domain of the access network.

The specification contains:

• a stage 1 description of the Lawful Interception service;

• a stage 2 description of the information flows between the functional entities (including the information elements involved) and triggering events; and

• a stage 3 description of the protocol and procedures to be used in mapping from stage 2 information flows and elements to Intercept Related Information (IRI) and Content of Communication (CC).

The present document is consistent with the definition of the Handover Interface, as described in TS 102 232 [2].

NOTE 1: Layer 3 interception is described in TS 102 234 [12].

NOTE 2: Layer 2 interception is not applicable to the PS domain of the GSM/UMTS networks (TS 123 060 [15]).