Question: In a Policy and Charging Control (PCC) scenario, if a Flow-Direction AVP is set to UNSPECIFIED (0) in a UE-initiated procedure, how should the service data flow detection apply the filter for uplink traffic?
Option 1: Ignore the filter for uplink traffic since no specific direction is declared.
Option 2: Apply the filter for uplink traffic as if the filter was bidirectional.
Option 3: Only apply the filter for downlink traffic to the UE, as per default behavior.
Option 4: Reject the request due to unspecified direction in UE-initiated procedures.
Explanation: According to the specifications, when the Flow-Direction AVP is set to UNSPECIFIED (0) in a UE-initiated procedure, the service data flow detection shall apply the filter for uplink traffic as if the filter was bidirectional. This ensures consistent handling of traffic direction when the direction is not explicitly specified by the UE but inferred for network management purposes.