Question: In a 3GPP network, which of the following statements accurately describes the support for Control Plane (CC) interception in MBMS Multicast services when using multicast stream routing to serving base stations/NodeB?
Option 1: CC interception is always supported through GSNs for all MBMS Multicast services.
Option 2: CC interception is not supported for MBMS Multicast services due to the lack of target identities in point-to-point bearers.
Option 3: CC interception for MBMS Multicast services relies on BM-SC to UE point-to-point bearer LI functionality exclusively.
Option 4: In multicast stream routing scenarios, GSNs may not intercept the MBMS stream due to unassociated IP addresses or target identities, limiting CC interception capability.
Explanation: This is correct because when MBMS content is routed via multicast streams to serving base stations/NodeB, the underlying transport bearer LI (e.g., GSNs for GPRS) may not be able to intercept the stream if no IP address or target-related identities are associated with it. This limitation affects the Lawful Interception (LI) capability for Control Plane (CC) in such MBMS Multicast scenarios.