Question: What happens when a Voice Group Call Service (VGCS) subscriber's group ID is in a deactive state on their SIM/USIM, and they receive a notification for that group?
Option 1: The mobile station automatically switches the group ID to an active state to receive the call.
Option 2: The mobile station ignores any notification for that group, and the subscriber cannot initiate voice group calls to the group.
Option 3: The subscriber is prompted to activate the group ID before deciding whether to receive or ignore the call.
Option 4: The network (HLR) overrides the local setting on the SIM/USIM to ensure receipt of the notification.
Explanation: According to VGCS principles, a subscriber has control over the active/deactive state of their group IDs on the SIM/USIM. When a group ID is set to deactive, the mobile station is instructed to ignore notifications for that group, preventing the subscriber from receiving unwanted calls but also disabling their ability to initiate voice group calls to the same group until it's reactivated. This setting ensures subscribers have direct control over their participation in voice group calls on a per-group basis.