Volume of streaming down when use JITSI API Medical Propouse


I have develop web app to apply remotly medical treatment with sound to the patitent, this is working very well by peer to peer comunication by webrtc. But in the last weeks i try add jisti to generate a communication channel(between Doctor-Patient)
The problem i have is when i enable jitsi on mobile web browser(like a patient) the volume of the treatment sound down perhaps a 50%. If i turn off the video only of patient the volume back to the normaly. I guess it must be something with the stream channels , if anyone can help I appreciate it