Projet 2a

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

Depending on the services the Correlation Numbers and Correlation Values are defined in different clauses of ETSI TS 133 108 V13.4.0:

Service Definition

Packet data domain (UMTS network access) ETSI TS 133 108 V13.4.0 §6.1.3 Multi-media domain ETSI TS 133 108 V13.4.0 §7.1.3 Evolved Packet System (EPS and non-3GPP ETSI TS 133 108 V13.4.0 §10.1.3 access)

IMS Conference service ETSI TS 133 108 V13.4.0 §11.1.4 IMS-based VoIP Services ETSI TS 133 108 V13.4.0 §12.1.4

Table 6-4: ETSI TS 133 108 Services

6.3.6 Timestamp

6.3.6.1 Time synchronisation

The precision of the timestamps generated by the CSP’s systems with respect to the reference time base must be within +/- 5 seconds.

The following server is defined as the reference time base:

Alias NTP time server: ntp.metas.ch

It is suggested to use the Network Time Protocol (NTP) according to IETF RFC 5905 for synchronisation, but any other system (e.g. DCF77, GPS, etc.) may also be used as long as the offset from the reference time base remains within the range of +/- 5 seconds.

6.3.6.2 Timestamp formats

The format of the timestamps delivered by the CSP may differ depending on the handover interface used to deliver intercepted data to the PTSS.

For the handover interfaces defined in ETSI TS 101 671 V3.12.1 and ETSI TS 133 108 V13.4.0 the timestamp can be provided either in:

a) Local time: as GeneralizedTime with the winterSummerIndication

parameter.

or

b) UTC time

For the handover interface defined in ETSI TS 102 232-1 V3.11.1 the timestamp can be provided either as:

a) GeneralizedTime: as UTC time with the time zone indication.

or

b) MicroSecondTimeStamp: with seconds and microseconds, a.k.a UNIX time epoch.

The timestamp in UTC time and with an accuracy to the millisecond is preferred.

6.3.7 Transmission of identifiers