Question: In a Policy and Charging Control (PCC) architecture, what is the required value for the Flow-Direction AVP within the Routing-Filter AVP sent from the PCEF to the PCRF?
Option 1: UNIDIRECTIONAL
Option 2: DOWNLINK
Option 3: UPLINK
Option 4: BIDIRECTIONAL
Explanation: The correct answer is BIDIRECTIONAL because, according to PCC specifications, the Flow-Direction AVP must be set to 'BIDIRECTIONAL'. This ensures the routing filter applies to both incoming and outgoing traffic, crucial for effective policy enforcement and charging control in telecom networks.