Question: In Lawful Interception (LI) for 3G security, how is the Network Element Identifier (NEID) typically conveyed when the Mediation Function is connected to the network using Signalling System Number 7 and ISDN User Part (ISUP)?
Option 1: Embedded within the Called Party Number information element
Option 2: Transmitted as a separate, dedicated LI parameter
Option 3: Carried by the Calling Party Number information element, with coding based on the type of network access
Option 4: Encoded in the Nature of Address field for national specific use
Explanation: The correct answer, Option 3, reflects the specified method for conveying the NEID in the context of Lawful Interception, emphasizing its inclusion within the Calling Party Number information element. This approach aligns with the need to identify the network element involved in the communication, facilitating effective interception and monitoring as per regulatory requirements. The other options are incorrect because they either misplace the NEID (Option 1), suggest a non-standard transmission method (Option 2), or limit its application to national specifics without addressing the general case (Option 4).