Question: In a 3GPP-compliant IP-based environment, what is the primary purpose of a third-party provider supplying detailed charging information to the telecom operator?
Option 1: To facilitate real-time billing for Voice over IP (VoIP) services only.
Option 2: For enhancing Quality of Service (QoS) parameters in multimedia transmissions.
Option 3: To enable effective charging for Value-Added Services (VAS), including accurate determination of service type, duration, and outcome.
Option 4: Solely for tracking network congestion and terminating party busy statuses.
Explanation: The detailed charging information is crucial for the telecom operator to accurately charge users for various Value-Added Services (VAS) in an IP environment, determining service type, duration, and outcome, which directly impacts billing.