Question: In a Policy and Charging Control (PCC) architecture, what is the primary purpose of the Callee-Information AVP (AVP code 565) in relation to the Policy and Charging Rules Function (PCRF)?
Option 1: To authenticate the User Equipment (UE) for network access
Option 2: To provide Quality of Service (QoS) parameters for a specific application
Option 3: To manage the policy for roaming subscribers
Option 4: To enable volume-based charging by providing callee information in PCC rule decisions
Explanation: The Callee-Information AVP is crucial for identifying the callee in an AF (Application Function) service session. This information is utilized by the PCRF to make informed PCC rule decisions, particularly for implementing volume-based charging accurately. This highlights its role in billing and charging processes within telecom networks, making Option 4 the correct answer.