No dial tone when waiting for a call to be answered

Hi all! There is a problem with the Talk application on iOS. When starting a call from an iPhone, the user does not hear a beep tone (beep-beep). There are no such problems on Android and PC. The connection works stably, STUN/TURN and PCB are used. The problem has been observed for a long time and does not depend on the iOS version. Please help with advice or a link to documentation. If the ticket is not clear, I will provide more detailed explanations.

If you’re talking about the in-call tone until a participant connects, this is currently not implemented in talk ios.

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Thank you very much for your answer! I’m really looking forward to the implementation.