Is there a way to increase the volume of the door station when talking via hik-connect. I couldn't find a way to increase the microsphone volume or the speaker volume of the door station when talking via hik-connect.
I believe that the only way to change the volume is via the door station's configuration menu in iVMS-4200.
If you haven't already, you'll need to add the door station to the software, and then click on the cog/settings button for it in Device Management>Device.
You can then adjust the main and sub-stream volumes on the Video/Audio>Audio page.
The main stream is the one that's recorded and the HD stream in Hik-Connect, whereas the sub-stream is the lower resolution stream default stream in the app: