CCTV Camera Pros iDVR-PRO H Series DVRs - Manual (Page 114)

Web Viewer
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Web Viewer
Audio Mapping
You can activate audio of a channel to communicate to
the remote user.
Click < > on the right side of each item to display
audio channels available to select.
Click <APPLY> to complete and apply audio setup.
\ \ About
Click the <INFORMATION> tab to check the model
name of the DVR as well as the web viewer version.