Question: In an MCPTT call, when the IWF floor control server is in the 'G: Floor Taken' state, which of the following timers MUST be running to ensure the floor control process integrity?
Option 1: Timer T1 (End of RTP media)
Option 2: Timer T20 (Floor Granted)
Option 3: Both Timer T1 (End of RTP media) and Timer T20 (Floor Granted)
Option 4: Only Timer T2 (End talking)
Explanation: When the IWF floor control server is in the 'G: Floor Taken' state, it has allowed specific media endpoints to transmit media. Timer T1 (End of RTP media) must run to manage the end of media transmission, ensuring a structured conclusion of the media session. Simultaneously, Timer T20 (Floor Granted) runs to guarantee the reliable delivery of the Floor Granted message, especially if such a request was queued, thus ensuring that all parties are informed of the floor status in a timely manner. While Timer T2 (End talking) can be running, it is not a must, making Option 3 the most comprehensive and correct choice.