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ETSI TS 101 158 describes the general requirements of Network Operators (NWOs), Service Providers (SvPs) and Access Providers (APs) relating to the provision of lawful interception, with particular reference to the Handover Interface (HI). The provision of lawful interception is a requirement of national law, which is usually mandatory. From time to time, a NWO and/or SvP and/or AP will be required, according to a lawful authorization, to make available results of interception, relating to specific identities, to a specific Law Enforcement Agency (LEA).

The general approach of the HI described in the present document is to be applied for every network technique, present or future, as long as the intercept requirements can be satisfied.