Projet 2a

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

The identifiers are to be transferred as follows:

1. CC HI3 interface:

For the delivery in the circuit switched domain the identifiers shall be transmitted in the D-Channel (that is, in the D-Channel of the respective CC link of the HI3 interface) when a CC link is established, using a DSS1 SETUP Message, within the Calling Party and Called/Calling Party Subaddress information elements. Subaddress option according to ETSI TS 101 671 V3.12.1 Annex E or ETSI TS 133 108 V13.4.0 Annex J apply.

For the delivery in the packet switched domain the identifiers shall be transmitted in the packet data unit according to ETSI TS 102 232-1 V3.11.1 Annex A.2 or ETSI TS 133 108 V13.4.0 Annex B.

2. IRI HI2 interface: The necessary identifiers shall be transmitted within every IRI record, to allow correlation at the LEMF.

6.3.8 FTP file naming and parameters for IRI records delivery

For the HI2 handover interfaces defined in ETSI TS 101 671 V3.12.1 and ETSI TS 133 108 V13.4.0 the IRI records are delivered to the LEMF with the FTP protocol. The sub-sections below specifies the file naming and the necessary parameters to operate the FTP

connection.

6.3.8.1 File naming

The composition of the filename is based on the file naming method B according to ETSI TS 101 671 V3.12.1 Annex C.2.2 or ETSI TS 133 108 V13.4.0 Annex A.2.

<Filenamestring> of the format ABXYyymmddhhmmsseeeet

Where:

‘AB’ ASCII letters are assigned by PTSS to the CSP

‘XY’ ASCII letters can be chosen by the CSP

6.3.8.2 FTP parameters

When transferring data via FTP the systems of the CSP act as sender (i.e. FTP client), and those of PTSS as recipient (i.e. FTP server).

PTSS operates several LEMF systems; therefore, the CSP shall be able to configure multiple FTP accounts in the mediation function(s) to reach the different LEMF systems. The

minimum number shall be 3.

The values of these parameters (e.g. IP address, username and password for the FTP account) are defined during the compliance assessment procedure.

The following rules apply in general:

1. Multiple IRI data sets can be treated as a single file. In case of ASN.1 encoded data, for example, an ‘IRI sequence’ is used for this.