Question: What is the primary purpose of the Sp reference point between the Subscription Profile Repository (SPR) and the Policy and Charging Rules Function (PCRF) in a telecom network?
Option 1: To enable direct data transfer between User Equipment (UE) and the PCRF for real-time policy enforcement.
Option 2: To facilitate communication between the SPR and other external policy servers for roaming scenarios.
Option 3: To allow the PCRF to request and receive subscription information related to IP-CAN transport level policies from the SPR based on specific identifiers.
Option 4: To manage the allocation of IP addresses to User Equipment (UE) across different PDN connections.
Explanation: The Sp reference point's key function is enabling the PCRF to retrieve subscription information pertinent to IP-CAN transport level policies from the SPR. This allows the PCRF to make informed decisions based on a subscriber's profile, ensuring network policies are applied correctly and dynamically updated if subscription information changes.