Jitsi echo issues

Hello, I was using Jitsi server and Jitsi app. I have no problems when using it with laptops. But I installed Jitsi app on Grandstream GVC3210 which runs on android 6. I’m having echo issues on it. When the GVC joins the meeting, there will be echo and everyone will hear the conversation twice. This is really annoying and disturbing the video conference. Your help is appreciated.