Avamprogetto 2a

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

b) the „rest“ of bearer services with the structure and codepoints defined in ETSI ETS 300

974 (2000) ASN.1 encoding BearerServiceCode.

The Teleservice Code allows two formats, the choice being a CSP option:

a) the PLMN-specific teleservices, individually defined by each Home Public Land Mobile

Network Operator, with codepoint for bits “4321” from 0 through F (Hex) with leading bits “8765” indicating the group PLMN “1101”, see ETSI ETS 300 974 (2000) ASN.1 encoding TeleserviceCode set from allPLMN-specificTS through plmn-specificTS-F.

b) the „rest“ of bearer services with the codepoints for bits „87654321“ defined in ETSI ETS

300 974 (2000) ASN.1 encoding TeleserviceCode.

6.5.1.1.4 Service octets for fix networks

For Fix networks the Calling Party Subaddress contains three parameters that allow

identifying the profile of the Content of Communication of the intercepted call. These are:

 Octet 19: The parameter Transmission Medium Requirement (TMR), see ETSI TS 101

671 V3.12.1 Table E.3.5.

 Octet 20: The parameter Bearer Capability (BC), see ETSI TS 101 671 V3.12.1 Table

E.3.5.

 Octet 21: The parameter High Layer Compatibility (HLC), see ETSI TS 101 671 V3.12.1

Table E.3.5.

ITU-T Recommendation Q.699 specifies how, among others, analog signaling, the

information elements of DSS1 SETUP, and parameters of ISUP IAM (Initial Address

Message) are to be used in specific call scenarios.

The service information available in principle at the Switch where the IIF resides depends on the connection from the calling party (target or third party) to the IIF which could be either ISDN or non-ISDN:

a) For ISDN, ITU-T Q.699 (09/97) § 2.1.1.1, in particular Table 1 in ITU-T Q.699 (09/97) (for

TMR), Table 3 in ITU-T Q.699 (09/97) (for User Service Information parameter, USI) and Table 6 in ITU-T Q.699 (09/97) (for User Teleservice Information parameter, UTI) applies.

b) For non-ISDN, including third calling ISDN with intermediate interworking, ITU-T Q.699

(09/97) § 2.2.1.1 applies. In relation to TMR, the value is 3.1 kHz audio. Neither the USI nor the UTI are present.

The following table describes the availability of service information within the switch where the IIF resides for various call scenarios in terms of ISUP parameters (TMR, USI, UTI), and defines the mapping of information contained in the ISUP parameters TMR, USI and UTI into the Calling Party Subaddress to be done by the IIF. It should be noted that the information on the service profile that is provided by the calling party, which could be the target or a third party, and is passed via signaling to the IIF is mainly relevant for the contents of octets 19, 20 and 21 in the Calling Party Subaddress.

In the case that an analog target terminates a call, there are implementation options as follows, the choice being a CSP option:

 Option a.: All parameters available in the switch where the IIF resides are mapped into

the octets 19 (TMR), 20 (USI), and 21 (UTI) of the Calling Party Subaddress.  Option b.: Only TMR is mapped into the octet 19 of the Calling Party Subaddress, while

20 (USI), and 21 (UTI) are set to “FF” (hex).