Question: What is the primary purpose of the SIP-2 reference point between the SIP core and the SIP Application Server (SIP AS) in the context of Service Enabler Architecture Layer for Verticals (SEAL)?
Option 1: To facilitate session management, media negotiation, and security for VAL services, including notifications, event subscriptions, and multicast operations.
Option 2: Exclusively for handling mobility management and location updates for User Equipment (UE) in vertical services.
Option 3: Primarily for billing and charging interfaces between the SIP core and external Vertical Application Servers.
Option 4: To manage Quality of Service (QoS) parameters for non-IP data delivery in SEAL environments.
Explanation: The correct answer, Option 1, accurately reflects the multifaceted role of the SIP-2 reference point as outlined in the context. It encompasses various critical functions necessary for the operational support of VAL services, including session establishment, security measures, event handling, multicast setup, and media parameters negotiation.