Question: What are the key responsibilities of an Interworking Function (IWF) when performing the participating role in Mission Critical Push To Talk (MCPTT) interworking with Land Mobile Radio (LMR) systems?
Option 1: a. Distribute floor control messages and support associated procedures. b. Perform endpoint floor control signalling on behalf of homed users. c. Support media plane security. d. All of the above.
Option 2: a. Only manage LMR system resources. b. Handle MCPTT to LMR voice call conversions. c. Prioritize emergency calls over non-emergency ones. d. None of the above.
Option 3: a. Act solely as a relay for MCPTT floor control messages. b. Implement media plane security for non-MCPTT services. c. Manage user authentication for LMR systems. d. Support only group communications.
Option 4: a. Convert digital to analog signals for LMR compatibility. b. Handle QoS for both MCPTT and LMR traffic. c. Provide location services for MCPTT users on LMR. d. None of the above.
Explanation: This option accurately reflects the responsibilities of an IWF performing the participating role, encompassing distributing floor control messages, performing endpoint floor control signalling for homed users, and supporting media plane security, crucial for seamless interworking between MCPTT and LMR systems.