Question: When a VLR/SGSN/MME receives service state information from the HSS/HLR for each barring of outgoing calls program, what is the expected action regarding storage of this information?
Option 1: The VLR/SGSN/MME shall discard the service state information to maintain storage efficiency.
Option 2: The VLR/SGSN/MME may optionally store the service state information based on network load.
Option 3: The VLR/SGSN/MME shall store the service state information received from the HSS/HLR.
Option 4: The VLR/SGSN/MME will store the information only if the subscriber's MS supports Phase 2 control.
Explanation: To ensure proper implementation of call barring services, the VLR, SGSN, or MME must retain the service state information. This storage enables accurate handling of outgoing calls based on the subscriber's service settings received from the HSS or HLR. Storing this information is crucial for effective call management and adhering to the subscriber's configured preferences.