Question: In a Mobile Originated Call (MOC) record, how is the mobile station roaming number encoded?
Option 1: As per GSM Association guidelines for roaming agreements
Option 2: According to the structure defined for numbering and addressing
Option 3: Based on the encoding scheme used for IMSI (International Mobile Subscriber Identity)
Option 4: Coded according to a standard providing format for charging data description
Explanation: The correct answer is Option 4 because the roaming number field in an MOC record is specifically coded according to a charging data standard, ensuring consistency across network elements for billing and charging purposes, particularly aiding seamless interoperability between operators in roaming scenarios.