Question: In the context of the EFAAeM (Automatic Answer for eMLPP Service) feature on a Subscriber Identity Module - Mobile Equipment (SIM-ME) interface, how are priority levels that allow the mobile station to automatically answer incoming calls encoded?
Option 1: Corresponding bits set to 1 for allowed priority levels, with reserved bits always set to 0.
Option 2: Corresponding bits set to 0 for allowed priority levels, with all reserved bits set to 1.
Option 3: A dedicated byte is allocated for each priority level, with the presence of the byte indicating automatic answer capability.
Option 4: Priority levels are encoded in a sequential binary format, requiring bit-wise calculation to determine auto-answer permissions.
Explanation: According to the EFAAeM specification, each eMLPP priority level is represented by a single bit within the EF (Elementary File). For any given priority level, if the mobile station is configured to automatically answer incoming calls of that priority, the corresponding bit is set to '1'. Conversely, a '0' indicates no automatic answering for that priority level. Additionally, reserved bits (like b8) are always set to '0', ensuring clarity and consistency in the encoding scheme. This approach efficiently communicates auto-answer permissions for multiple priority levels within a compact binary format.