Sound problem for more than 2 users

Audio transmission that works fine in a 2-user session does not work when a 3rd user is added.
If I have users A, B, C, and user A is the person who created the room. In this case, person A can hear people B and C, while people B and C do not hear each other. Can you help me solve this problem?

Probably you have a UDP/10000 connectivity issue or a websocket issue. There are many posts related in these issues in the forum, they may be helpful

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Thank you for your help.
The problem was solved in this way, but this time, some users have a problem with sound transmission. The voice of some users in the meeting is not transmitted.