Liaison and studies into the impact of lawful interception on TIPHON and TIPHON access networks. This shall include the following specific tasks: Review of IUR, CALEA and ETR 331 to assess applicability to TIPHON and report findings to TC-SEC-L1 in addition to EP-TIPHON; Review of TIPHON access networks to determine capability to support L1 requirement; Act as primary liaison with TC-SEC-L1 during development of packet data handover interface ensuring that it is suited to TIPHON.