Question: In VGCS (Voice Group Call Service), when a mobile station responds to a notification without a voice group call channel description, how is a talking service subscriber requested to join the voice group call channel?
Option 1: Immediately via a Channel Release Procedure
Option 2: Via either a Channel Assignment Procedure, a Handover Procedure, or a Channel Mode Modify Procedure
Option 3: Only after switching to listener mode
Option 4: Not requested until the dedicated connection is released
Explanation: According to VGCS protocols, if the service subscriber is already engaged in talking when the network is ready for them to join the voice group call, the network utilizes specific resource allocation or modification procedures to ensure seamless integration without interrupting the ongoing communication. This is achieved through a Channel Assignment Procedure (for new resources), a Handover Procedure (for transferring between different types of connections), or a Channel Mode Modify Procedure (for adapting the existing channel to the required mode for the group call). This approach ensures that the subscriber can join the voice group call as a talker without interruption.