Avamprogetto 2a

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

The figure below depicts the format of the Called Party Subaddress for a five digit CIN.

octet bit

8 7 6 5 4 3 21

1 Called party subaddress information element identifier 0 1 1 1 0 0 01

2 Length of calling party subaddress contents (9 octets in this case)

0 0 0 0 1 0 01

3 ext. Type of subaddress Odd/ev Spare en 1 0 1 0 0 0 00

(even)

4 Operator-ID Operator-ID (MSD) NOTE

0 0 0 0 1 0 01

5 Operator-ID Operator-ID 0 0 0 0 0 0 00

6 Field separator Operator-ID (LSD)

1 1 1 1 0 0 01

7 CIN CIN (MSD)

8 CIN CIN

9 Field separator CIN (LSD)

1 1 11

implementation option)

10 Field separator or Spare (IIF Field separator 1/0 1/0 1/0 1/0 1 1 11

Figure 6-3: Called Party Subaddress Information Element ETSI TS 133 108 V13.4.0

NOTE: In this Called Party Subaddress the Operator-ID value is set as an example to

„90001“.

The LEMF shall take the parameter “CIN” as the last parameter in the Called Party

Subaddress when followed by at least two consecutive Field separators and no further fields other than Field separator or Spare, otherwise the Called Party Subaddress contains a “National parameter” to be treated by LEMF.

6.5.2.1.3 Format of the Calling Party Subaddress Information Element

ETSI TS 133 108 V13.4.0 Table J.2.6 specifies the format of the Calling Party Subaddress information element including the Lawful Interception specific parameters to be sent as part of the setup message to LEMF when a CC-link is being established. The format according to ETSI TS 133 108 V13.4.0 Table J.2.6 shall be supported as detailed in this section.

Some of the parameters contained in the Calling Party Subaddress are of variable length. Depending on their length they appear in different instances of the Calling Party Subaddress while retaining the order.

For the LI specific parameters of the Calling Party Subaddress ETSI TS 133 108 V13.4.0 Annex J.2.3 applies with the following clarification:

a) The odd/even indicator defines the number of half-octets up to an including the Field

separator subsequent to the parameter “Direction” which is either in an odd (Field

separator shall be mapped into bits “4321”) or an even (Field separator shall be mapped into bits “8765”) position within the half-octet structure. It does not include the spare field, if any, between the last Field separator and octet 19.

b) For parameters with a numeric value that spans more than one half-octet (this is LIID) the

Most Significant Digit (MSD) is the half-octet with the lowest number.