Tech-invite3GPPspecsSIPRFCs
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Content for  TS 33.107  Word version:  16.0.0

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C  Information flows for the invocation of Lawful Interception for Packet Data with multimedia |R5|Word‑p. 307

C.0  General |R12|

The following figures show the information flows for the invocation of Lawful Interception for Packet Data with multimedia. The figures show some of the basic signalling messages of the target Packet Data communication and the events on the X2 interfaces. The dotted lines indicate signalling depending on whether IRI information has been requested. The figures illustrate interception in the visited network.
The figures in this annex only apply to scenarios where the P-CSCF is located in the visited network. In some operator deployment scenarios, the P-CSCF will be in the Home Network. Where the P-CSCF is located in the Home Network and UE to P-CSCF signalling encryption is applied, all SIP messages between the P-CSCF and the UE will be encrypted within the visited network and therefore plain text interception in the visited network may not be possible.
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C.1  Multimedia registration

Figures C.1.1 and C.1.2 show the intercept of the Multimedia registration for the case of visited network interception (refer to TS 23.228 clauses 5.3.2.4 and 5.3.2.5).
Figures C.1.1 and C.1.2 show the intercept of the Multimedia registration for the case of visited network interception, where the P-CSCF is located in the Visited Network (refer to TS 23.228 clauses 5.3.2.4 and 5.3.2.5).
Figure C.1.1: Intercept of Start of Multimedia Registration
[not reproduced yet]
Figure C.1.2: Intercept of Continuation of Multimedia Registration
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C.2  Multimedia Session Establishment and AnswerWord‑p. 309
Figure C2 shows the intercept of the Multimedia Establishment and Answer in the visited network, where the P-CSCF is located in the Visited Network (refer to TS 23.228, clause 5.7.1).
[not reproduced yet]
Figure C.2: Intercept of Multimedia Establishment and Answer at Visiting Network
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C.3  Multimedia ReleaseWord‑p. 310
Figure C.3 shows the intercept of the Multimedia Release in the visited network, where the P-CSCF is located in the Visited Network (TS 23.228, clause C.2.1 reference available).
[not reproduced yet]
Figure C.3: Intercept of Multimedia Release at Visiting Network
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C.4  Multimedia with Supplementary Service - Call Forwarding

Not defined in this release.

C.5  Multimedia with Supplementary Service - Explicit Call Transfer

Not defined in this release.

C.6  Multimedia with Supplementary Service - Subscriber Controlled input

Not defined in this release.

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