Question: In a Mobile Subscriber ISDN Number (MSISDN) structure, what primary purpose do the Country Code (CC) and National Destination Code (NDC) serve in the context of signaling within a telecom network?
Option 1: To uniquely identify a subscriber's terminal equipment for billing purposes.
Option 2: To provide routing information for messages to the home location register of the MS.
Option 3: To determine the type of supplementary services available to the subscriber.
Option 4: To encode sub-address information for call setup operations.
Explanation: The Country Code (CC) and National Destination Code (NDC) within an MSISDN are crucial for providing routing information, ensuring messages can be efficiently directed to the home location register of the Mobile Station (MS), a fundamental aspect of managing and routing communications in telecom networks.