Question: What is a primary purpose of configuring distinct PSIs and/or wildcarded PSI ranges in the Home Subscriber Server (HSS) for an Application Server (AS) hosting a Public Service Identity (PSI)?
Option 1: To enable direct billing for services accessed through the PSI
Option 2: To facilitate handover between different access networks (e.g., from Wi-Fi to LTE)
Option 3: To authorize and verify access as a 'PSI user' for AS-originating requests without requiring full IMS user subscription information
Option 4: To prioritize traffic for PSIs over standard IMS services within the network
Explanation: Configuring distinct PSIs and/or wildcarded PSI ranges in the HSS is crucial for managing access to Public Service Identities hosted by an Application Server. This configuration specifically aims to enable authorization and verification processes for 'PSI users' without necessitating full subscription/access information, ensuring secure and controlled access to PSI-hosted services while streamlining authentication.