Question: In the context of IMS performance management, what is the primary purpose of measuring the mean setup time for successful IMS initial registrations at P-CSCF?
Option 1: To optimize UE (User Equipment) battery life by reducing unnecessary network interactions.
Option 2: To support Vendor Performance Modelling, Operator Traffic Engineering, and Vendor Development Engineering efforts.
Option 3: To directly enhance the end-user's Quality of Experience (QoE) for real-time communication services.
Option 4: To comply with regulatory requirements for network performance transparency.
Explanation: The correct answer aligns with the specified use case, indicating its primary purpose is to inform and improve Vendor Performance Modelling, Operator Traffic Engineering, and Vendor Development Engineering, rather than directly impacting UE battery life, end-user QoE, or regulatory compliance.