Question: What triggers the counting of 'Attempted SRNS Relocation Intra MSC-S from UMTS to UMTS' in a Core Network (CN) Circuit Switched (CS) domain?
Option 1: Receipt of a 'RELOCATION_COMPLETE’ service indication
Option 2: Receipt of an 'IU_RELOCATION_REQUIRED’ service indication
Option 3: Handover initiation from GSM to UMTS
Option 4: Cell update procedure in the same MSC Server
Explanation: The correct answer is Option 2 because the counting is triggered by the receipt of an 'IU_RELOCATION_REQUIRED’ service indication, indicating a need for relocation within the same MSC Server, highlighting the importance of service indications in managing and measuring network performance during handover procedures.