Question: In a mobile network, which entity is responsible for allocating the Call Reference Number used in call control scenarios?
Option 1: Home Location Register (HLR)
Option 2: Visited Mobile Switching Center (VMSC)
Option 3: Gateway Mobile Switching Center (GMSC)
Option 4: Call Control Mobile Switching Center (MSC)
Explanation: The correct answer is the Call Control Mobile Switching Center (MSC) because, according to telecom principles, the MSC that handles call control functions is responsible for allocating and managing call reference numbers. This ensures efficient tracking and management of calls within the network. The HLR is primarily involved in subscriber data management, the VMSC in handling calls for roaming subscribers, and the GMSC in gateway functions for external communications, making them less directly involved in allocating call reference numbers for internal call control purposes.