Applies to: Argus; Argus 2; Argus Eco; Argus Pro; Argus PT; Reolink Go; Reolink Go PT; Reolink Keen; C1; C1 Pro; C2; C2 Pro; E1; E1 Pro; E1 Zoom; Reolink Lumus;
The two-way audio feature is only available when the camera works as an individual device. The feature will not be available when you connect the camera to the NVR and view the camera as a channel of the NVR. You may refer to the article below to get more information.
You could use the Two-way audio function on your Reolink Client/App.