Use phone/android as mic

I am using latest endeavour i3.
I want to use my phone as a mic. So I downloaded the murmur server, mumble on pc, and mumbla on android.
Now I am able to use my phone as mic, but the problem is, I hear my own voice too (through earphones which is connected to pc), which is disturbing and annoying.
I know a windows program (WO mic) which does the same thing without the echo. Now I can’t use it as it is for windows, plus it is proprietary.
I would really appreciate if someone can help me fix this.
I welcome any other workaround/program/software too, as long as it is foss.
Thank you!