Hi TomcCTV, thanks for a responder.
Maybe I didn't know how to explain well. The camera and the NVR is SMAR model:
WN1908F(NVR)
and WIFI PTZ Camera model Q-NXK2004-W (Camera)
The app I use ICSee. From the app, with my smartphone, I can listen to the voices.
A way to silence it, is lowering the volume of my smartphone, But I wanted to totally disable the audio, that is, that no one could hear.
I don't know if it is possible to do it.