Missing audio when start a mute conference

Hi there,

Currently, we’re running into a problem when we start a conference with 2 persons in the room (both mute their audio & video). After both of them joined, one unmutes their mic and start talking (in this case the owner) but the other can’t hear them. Video works just fine but only the audio is the problem. Can you give me some pointer on how to debug this? Since the jicofo log & console log stated that the audio source has been notified. web-rtc internal also recognized the audio source.

FYI: we run our own deployment & load the conference in a frame using the external API.

Thank you,
Tien