Question: What is the primary purpose of maintaining a list of dispatcher identities (ISDN/MSISDN numbers) in the context of Voice Group Call Service (VGCS)?
Option 1: To facilitate roaming services for dispatchers across different networks.
Option 2: To enable the anchor MSC to verify and establish dedicated communication paths for voice group call setup and teardown by authorized dispatchers.
Option 3: To provide a directory service for subscribers to look up dispatcher contact information.
Option 4: To prioritize voice group calls over regular voice calls in the network.
Explanation: The correct answer highlights the crucial role of dispatcher identities in VGCS for security and connectivity purposes. By verifying these identities, the anchor MSC ensures that only authorized dispatchers can initiate or terminate voice group calls, maintaining the integrity and control of the service.