Question: In a network deploying multiple, separately addressable Home Subscriber Servers (HSSs), what is the primary function of the Subscription Locator Function (SLF) or Diameter Proxy Agent in the User identity to HSS resolution mechanism?
Option 1: To determine the HSS identity based on user identity and optionally load values, then forward requests directly to the determined HSS.
Option 2: To manage server farm architectures for single HSS solutions.
Option 3: To handle Cx request routing between I-CSCF and S-CSCF without involving HSS.
Option 4: To provide Diameter base protocol specifications for Dx interface implementation.
Explanation: The correct answer highlights the key role of the SLF or Diameter Proxy Agent in resolving HSS identities, determining the appropriate HSS based on user identity and optionally load values, before forwarding the Cx request to the determined HSS. This process is crucial for efficient communication in networks with multiple HSSs.