Hi @Sven Callewaert apologies for the delay in response. It sounds like you are using ACS calling SDK so you should be fine. The retiring of TURN should not affect you.
However, if you built your own calling solution and are ONLY using ACS TURN then you will need to find another solution for your needs for when you need to relay your calling needs via TURN. Please read this ACS documentation for more information on TURN.
Best,
Grace