Question: Upon expiry of Timer T20 (Floor Granted), what action does the IWF floor control server take regarding sending a Floor Granted message, if counter C20 hasn't reached its upper limit?
Option 1: It sends a Floor Release message to all participants and moves to 'Idle' state.
Option 2: It sends a Floor Granted message with specified fields (Duration, Floor priority, and possibly Floor Indicator) to the granted floor participant.
Option 3: It pauses Timer T20 without sending any messages until further input from the group call controller.
Option 4: It automatically denies the floor to the current participant and grants it to the next in queue.
Explanation: Upon Timer T20 expiry, if counter C20 hasn't reached its limit, the IWF server is specified to send a Floor Granted message. This message must include the Duration (value of timer T2), the granted priority, and under specific group call conditions, the Floor Indicator field. This ensures continuous management of floor control within the constraints set by the timers and counters, maintaining orderly communication in critical scenarios like emergency or broadcast group calls.