Question: In a GSM network, when a Mobile Station (MS) is on a Voice Channel and utilizes the CMEA Encryption for Voice Channel Data Digits as per 3GPP specifications, what is the maximum total byte length that can be encrypted for a Called Address Message in response to a hookflash?
Option 1: 8 bytes (2 words, each up to 4 bytes)
Option 2: 16 bytes (4 words, each up to 4 bytes as specified, but with an incorrect assumption on word count)
Option 3: 32 bytes (maximum size for general data encoding, not specific to Called Address Message context)
Option 4: 16 bytes (4 words, each up to 4 bytes per word, matching the specification for Called Address Messages)
Explanation: According to the specifications, for a Called Address Message in response to a hookflash, up to 4 bytes per word are encrypted, with a total of 4 words. This directly translates to a maximum of 16 bytes (4 words * 4 bytes/word), making Option 4 the correct answer. This highlights the importance of precise parameter adherence in telecom encryption protocols for specific message types.