L.2 Definition of Conference LI Correlation header

33.1083G Security3GPPHandover interface for Lawful Interception (LI)Release 17TS

ConfLIC-header is defined in ASN.1 [5] (see annex B.11.2) and is encoded according to BER [6]. It contains the following attributes:

– Object Identifier (hi3DomainId)

– Lawful Interception Identifier (lIID, optional). The handling of Lawful Interception Identifier is done according to national requirements.

– Conference Correlation (confCorrelation). This is defined in B.11.1 and the handling of the same is described in clause 11.

– Time Stamp (timeStamp, optional). The handling of time-stamp is done according to national requirements.

– Sequence Number (sequence-number). Sequence Number is an integer incremented each time a T-PDU is delivered. Handling of sequence number is done according to national requirements.

– TPDU direction (t-PDU-direction) indicates the direction of the T-PDU and it accommodates the following possibilties:

– From the target (from-target). The Conf-CC-PDU is coming from the target to the conference mixer.

– To the target (to-target). The Conf-CC-PDU is sent towards the target from the conference mixer.

– Not known (not known). This is used when the TPDU direction cannot be determined.

– Conference target (conftarget). This value is to be used when conference itself is the target.

– From the Mixer (from-mixer). The Conf-CC-PDU is coming from the conference mixer.

– To the Mixer (to-mixer). The Conf-CC-PDU is sent towards the conference mixer.

– Combined (combined). The Conf-CC-PDU is combined consists to and from the conference mixer or to and from the target.

– National parameters (national-HI3-ASN1Parameters, optional)
This parameter is encoded according to national requirements.

– Media ID (mediaID, optional)
This indicates media information being exchanged by parties on the conference. This includes the following two:

– ConfPartyInformation (sourceUserID, optional). This includes the conference side of the SDP information.

– Stream ID (streamID, optional). This includes the stream ID from the SDP.