Vorlage 3a

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

(consecutive) empty fields there are four field separators present in total, etc...

The format depicted in the figures below illustrates this clarification.

d) The service octets 19 (TMR), 20 (BC octet 3), and 21 (HLC octet 4) shall be present even

if a parameter is not available (Note). In the latter case a value “FF” hex shall be entered.

NOTE: The term “available” refers to the presence of a parameter in the signaling messages, i.e. denotes “when provided” by the function that is subject to interception.

6.5.2.1.2 Format of the Called Party Subaddress Information Element

ETSI TS 133 108 V13.4.0 Table J.2.5 specifies the format of the Called 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.2.5 shall be supported as detailed in this section.

Some of the parameters contained in the Called Party Subaddress are of variable length.

Depending on their length they appear in different instances of the Called Party Subaddress while retaining the order.

For the LI specific parameters of the Called 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 and including the final

Field separator which is either in an odd (final Field separator shall be mapped into bits “4321”) or an even (final Field separator shall be mapped into bits “8765”) position within the half-octet structure. It does not include the spare field, if any, at the end.

b) For parameters with a numeric value that spans more than one half-octet (these are

Operator-ID and CIN) the Most Significant Digit (MSD) is the half-octet with the lowest number.

c) The value to be entered into a spare half-octet is undefined in ETSI TS 133 108 V13.4.0.

It shall be set the value of “0000”. At the receiving side spare shall be ignored, i.e. the message containing the Called Party Subaddress shall not be rejected because a spare bit is set to “1”.