Question: Upon receiving RTP media packets from an MCPTT (Mission Critical Push To Talk) media endpoint, what action does the IWF (Interworking Function) floor control server take regarding timer T1 (End of RTP media) for the participant sending the RTP packet?
Option 1: Stops timer T1 immediately to prevent overlap
Option 2: Resets timer T1 only if another participant requests the floor
Option 3: Leaves timer T1 unchanged, as it's not relevant to receiving packets
Option 4: Restarts timer T1 for the participant from which the RTP packet was received
Explanation: Restarting timer T1 (End of RTP media) upon receiving an RTP packet ensures that the timer reflects the ongoing transmission, preventing premature expiration and potential floor release while a participant is still actively transmitting. This action is crucial for maintaining proper floor control and avoiding interruptions during critical communications in MCPTT scenarios.