Bosch NBC-265-W Installation And Operation Manual page 90

136 en | Operation via the browser
All connected users receive audio signals sent from the camera
but only the user who first pressed the F12 key can send audio
signals; others must wait for the first user to release the key.
AR18-10-B012 | v1.54 | 2011.08 Installation and Operation Manual
IP Camera 200 Series
Bosch Security Systems