Content for  TS 33.126  Word version:  16.2.0

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5  General interception lifecycle and model

5.1  Lifecycle

Figure 5.1 depicts the general Lawful Interception lifecycle.
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Figure 5.1: Generic Lawful Interception lifecycle
After a LEA Warrant is delivered to the CSP, the interception is provisioned. In the ACTIVE state, the Lawful Interception system elements detect, capture and deliver Interception Product to the LEA (labelled "production" in Figure 5.1). These three production actions occur each time a targeted communication is identified, and therefore may happen many times during the lifecycle.
Depending on requirements, once provisioned, the LI system can enter directly into the ACTIVE state, or enter into the INACTIVE state, in which it still requires a RESUME transition to enter the ACTIVE state. The "production" activities of detect, capture, and deliver from figure 5.1 happen only in the ACTIVE state. It is in this ACTIVE state only that Interception Product is delivered to the requesting LEA.
A transition from INACTIVE to ACTIVE will resume the process from the detect action. Conversely, a transition from ACTIVE to INACTIVE will immediately suspend delivery to the LEA (i.e., if there are communications that have been detected or captured, they will be discarded and not delivered to the LEA).
If provisioning enters the INACTIVE state, the RESUME transition is the equivalent of a delayed start.
Some jurisdictions may not support the INACTIVE state of the interception. In such cases, the production actions start directly upon provisioning, and stop directly upon de-provisioning.

5.2  ModelWord‑p. 9
Figure 5.2 depicts the general interception model. Lawful Interception (LI) is implemented in a 3GPP Communication Service Provider (CSP) network by the logical elements shown in the figure. Detailed LI architecture and functions are found in TS 33.127, while delivery details are found in TS 33.128.
The Administration Function (ADMF) provides the CSP's administrative functions for the LI capability, including provisioning and de-provisioning the Point(s) Of Interception (POI(s)) and the Mediation and Delivery Function (MDF).
A POI detects and captures the target's communications, based on information provided by the ADMF, passing the Interception Product to the Mediation and Delivery Function.
The MDF performs any necessary mediation of the Interception Product before delivering it on to the LEA's Law Enforcement Monitoring Facility (LEMF).
The LEMF is the logical element in the LEA which receives Interception Product.
[not reproduced yet]
Figure 5.2: Generic Lawful Interception model

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