Question: In an MCPTT (Mission Critical Push To Talk) scenario, when an ongoing session is upgraded to an emergency group call with the "mc_implicit_request" fmtp attribute indicated in the SDP offer, what action does the IWF (Interworking Function) floor control server take regarding its state?
Option 1: It transitions to 'Floor Granted' state to prioritize emergency communication.
Option 2: It remains in the 'Not Permitted and Floor Idle' state, awaiting further arbitration logic input.
Option 3: It automatically denies all existing floor requests to accommodate the emergency upgrade.
Option 4: It enters a 'Pending' state until explicit floor request acknowledgement from all participants.
Explanation: According to MCPTT media plane control specifications, upon receiving an implicit floor request due to an upgrade to an emergency group call (indicated by the "mc_implicit_request" fmtp attribute in the SDP offer), the IWF floor control server's primary action is to notify its arbitration logic while maintaining a cautious state. This ensures orderly management of floor control without prematurely granting access, hence it remains in the 'Not Permitted and Floor Idle' state. This approach balances the urgency of emergency communications with the need for controlled, managed access to prevent potential conflicts or disruptions.