Question: Upon expiry of Timer T1 (End of RTP media) in an MCPTT environment, what action does the IWF floor control server take regarding RTP media packets from the affected participant?
Option 1: Continues distributing all RTP media packets to other media endpoints without interruption.
Option 2: Requests the media distributor to stop distributing new RTP media packets (excluding those already in the buffer, if buffering is ongoing) from the participant to other media endpoints.
Option 3: Immediately discards all buffered RTP media packets from the participant and enters a 'Floor Hold' state.
Option 4: Starts Timer T2 (Stop talking) for all participants and pauses the floor control arbitration logic temporarily.
Explanation: Upon Timer T1 expiry, indicating the end of RTP media from a participant, the IWF floor control server must manage resources efficiently. The correct action involves stopping further distribution of new RTP media packets from that participant (with a buffer exception, if applicable), ensuring unnecessary data is not propagated, thus maintaining network efficiency and adhering to MCPTT's media plane control interworking principles with LMR systems. This aligns with the principle of controlled media distribution in critical communication environments.