Originally Posted by
unmanned_droid
Especially as this aircraft was apparently about an hour behind schedule. Perhaps there weren't supposed to be any aircraft operating from the airport at that time (I guess someone here would know?) - the SAM unit wouldn't necessarily be tied in to the civil ATC or monitoring their freqs, let alone be actively talking to them on the 'phone or radio.
Traffic in and around Tehran during the time in question according to Flightradar:
https://www.flightradar24.com/2020-0.../35.56,51.64/9