Every method worked, but cannot produce sound

I can successfully produce, consume, produceData, and consumeData, but the one who joins a room first cannot produce sound.

For example, if there are A and B in a room,
if A joins a room first, B can talk to A, but no sound would come from A.

Do you have any ideas?

I used sendTransport.on('connectionstatechange') and found out the connectionstate become connected before another user joins a room.

this.sendTransport.on('connectionstatechange', (connectionState) => {
      console.log('connectionState: ', connectionState);
      if (connectionState === 'connected') {

You must NOT wait for “connectionstatechange” in order to consume() or produce(). That’s not documented anywhere.