Question: In an MCPTT call initiated scenario, as per 3GPP standards, what action does the originating IWF (Interworking Function) floor participant take if it receives a floor control message before receiving the SIP 200 (OK) response?
Option 1: Immediately act upon the floor control message
Option 2: Store the floor control message until the SIP 200 (OK) response is received
Option 3: Discard the floor control message and wait for the SIP 200 (OK) response
Option 4: Send an error response to the sender of the floor control message
Explanation: This action ensures that the IWF floor participant handles potential processing delays in the SIP core correctly, by temporarily storing the floor control message until the call setup is confirmed with the SIP 200 (OK) response, thus maintaining the integrity of the call setup process.