Decisions on foul call reviews will be made by the on-court Crew Chief; decisions on other challenges will be made by the Replay Center referee.
See below for more information about the newly-adopted Coach’s Challenge: The NBA Board of Governors has approved the introduction of a Coach’s Challenge to trigger instant replay review of a limited set of matters. A version of the Coach’s Challenge that has been in effect in the NBA G League...
https://official.nba.com/coachs-challenge/