How to reduce audio feedback?

Hello everyone! I developed multiplayer game and voice chat for it. I used this assets
https://github.com/fholm/unityassets/tree/master/VoiceChat
and it works good. But I have only one problem. When it works on mobile phone, i have audio feedback effect, like resonance. It happends because microphone catch speaker sounds. How i can prevent this? Maybe use some filters…Help me please who have the same problem.

I’d love to hear ideas on this too!

Sorry, Can you get a solution?