ID and voice record appear to be separate systems. The SD card can store voice messages with timestamp as well GPS data.
Ah, yes this matches how mine works. Basically the stack function records IDs (but only the user ID and channel name,
not talkgroup) with timestamps (though there is some weird de-duplication logic in the timestamps if the same user calls more than once in a short period of time). Recording function gives just the timestamp (the second blank field I see must be the GPS data, I am curious how that displays).
I think technically the stack may record analog IDs too, but it only records
selcalls, so if it's someone just sending MDC ID without directing a call to a MDC user or group, it won't log anything. I need to get a second MDC-capable radio to test this though.