Question: What are the primary functions of the SIP-3 reference point, as defined for interactions between two SIP cores in support of Vertical Application Layer (VAL) services?
Option 1: Authentication, Authorization, and Accounting (AAA) management; Network Attachment; Device Management
Option 2: Event Subscription and Event Notification; Session Management; Media Negotiation
Option 3: Quality of Service (QoS) Provisioning; Policy Control and Charging; Mobility Management
Option 4: Service Discovery; Application Function Registration; Data Storage Management
Explanation: The SIP-3 reference point facilitates communication between two SIP cores to support VAL services, primarily managing event subscriptions and notifications for real-time updates, overseeing session management for establishing, modifying, and terminating sessions, and handling media negotiation for effective communication compatibility.