Avamprogetto 2a

Technical requirements for the handover interfaces for the execution of telecommunications surveillance

Clause Selection of ETSI options for Additional requirements ETSI TS Switzerland

133 108

V13.4.0

7 Multi-media domain

The provision of the lawful

interception of services supported by the IP Multimedia Core Network Subsystem (IMS) shall be carried out in conformity with the provisions of the technical specification

corresponding to RELEASE 7 or higher, according to the releases in which the telecommunications services in question are found at each time.

7.1 Identifiers

Interception is performed on an IMS identifier(s) associated with the interception subject including

identifier types such as SIP URI and Tel URI and IMEI if available.

NOTE: MSISDN and IMSI can be represented in the user part of the SIP URI and Tel URI if available.

7.1.1 Lawful Interception Identifier (LIID)

The use of a single LIID for multiple target public user identities (e.g. SIP URI and TEL URI) all pertaining to the same target is required.

7.1.2 Network identifier

The operator-Identifier is composed of 5 digits provided by PTSS.

The Network-Element-Identifier (NEID) parameter shall be provided. 7.2.1 Timing

IMS specific timestamp shall have a precision to the millisecond.

7.3 Security aspects

The delivery of the IRI records uses one of the delivery networks as described in VD-ÜPF Annex 2. It shall be agreed between the CSP and PTSS.

7.4 Quantitative aspects

As the realisation of the IMS-based VoIP services is depending on the user equipments and the CSP network capabilities, the PTSS cannot provide meaningful guidance for the dimensioning of the target interceptions to be supported.

8. 3GPP WLAN

8 3GPP WLAN interworking