How does it work on trunking systems? Analog?
There is no MDC for trunking.
For SmartNet/SmartZone, the IDs for talking subscribers depends on the trunking format selected by the System Operator. Very much in general:
A) For "Message Trunking," there is no ID.
B) For "Transmission Trunking," the ID of the subscriber initiating the channel grant is part of the OSW that causes other subscribers to shift to a voice channel.
C) For "PTT-ID" trunking, the ID should carry through for responding units (within the dwell timer for the voice channel assignment), but not all radios will pick it up.
For Astro Trunking, similar to "PTT-ID Trunking," but all subscribers should pick it up.
For analog, ID is via MDC-1200. (Or some different coding scheme, such as DTMF.)