Question: During S-GW relocation for an intercepted IMS session, what action does the new S-GW/BBIFF take upon receiving instruction from the LMISF regarding CC interception?
Option 1: Drops all media packets associated with the IMS Signalling Bearer to prevent information leakage.
Option 2: Delivers the packets from the Media Bearer associated with the IMS Signalling Bearer to the LMISF for further processing as CC.
Option 3: Notifies the UE of the S-GW relocation and requests acknowledgement before proceeding.
Option 4: Buffers the media packets temporarily until the old S-GW confirms the completion of its relocation role.
Explanation: Upon S-GW relocation, to maintain uninterrupted lawful interception (both IRI and CC), the new S-GW/BBIFF must continue forwarding relevant traffic. For Content of Communication (CC) interception, this involves delivering media packets associated with the intercepted IMS session's signalling bearer to the Lawful Interception Management System Function (LMISF) for onward transmission to the Delivery Function (DF3). This ensures continuity of interception without disrupting the ongoing communication or the lawful intercept process.