Dahua 2 way audio from SmartPss or web interface trought NVR to POE camera

[Epatix]

I have multiple DAHUA cams connected to 1 DAHUA NVR and I have trouble with 2 way audio.

I connect the NVR from SmartPSS or Web interface on my local lan
I select the camera in live preview
I click the "SPEAKER" icon and I have the sound from the mic of the camera ->OK
Then I click the "MIC" icon , the camera speaker should broadcast the sound from my PC/laptop microphe but it doesn't -> No sound output
Even more strange I get on my PC speaker the sound from NVR connected microphone

I'm getting crazy with this.
Any idea would be welcome

 

[smole]

List your NVR and cam models.

 

[Epatix]

NVR2108HS-8P
This model is 8 port with POE

IPC-HDBW4233R-AS
This model has RCA audio input and RCA audio output

I have also to say that when connecting directly from the physical NVR (external mic and speaker) to the camera it works perfectly but never with remote login on the NVR from SmartPSS or Web interface