Is there any specifics in setting up a turn server specifically for calls?

Question

VoIP

I set up an ice server - restund, connect two phones via sim cards, because of NAT I leave with stun on turn the connection opens, messages go, but there is no sound, in the offer the sound is requested with ports on the server like everything is ok
Please tell me what could be problem?
client written in JAVA for Android 28 API

Answer 1

Take a dump and figure it out ...