Question: When Fixed Dialling Mode is enabled on a User Equipment (UE), what happens to bearer services/teleservices with destination addresses not stored in the Fixed Dialling Number (FDN) entries, except for those explicitly excluded?
Option 1: They are automatically redirected to a default service center for processing.
Option 2: The Mobile Equipment (ME) prevents their establishment on a per bearer service/teleservice basis, unless specifically exempted by their service code stored in the SIM/USIM.
Option 3: They are allowed but with reduced quality of service (QoS) to discourage non-FDN usage.
Option 4: The UE prompts the user to authenticate with PIN2 before allowing or blocking the service.
Explanation: According to the Fixed Dialling feature's specifications, when enabled, an ME supporting this feature must prevent the establishment of bearer services/teleservices to destination addresses not in FDN entries, on a per bearer service/teleservice basis. Exceptions are made for services listed in the SIM/USIM as exempt from this check, characterized by their service code. This ensures controlled access to only pre-programmed numbers and specific exempted services when Fixed Dialling Mode is active.