This function is used for capturing snapshot when someone is calling VTH from VTO or unlocking door. You can set it on VTO website.
Local Setting → Basic → Events menu → Confirm
Please refer to Fig.1 for details.
Figure 1. VTO configuration(sample model: VTO3211D-P4-S2)
Video and audio message and recording require SD card inserted into VTO or enable FTP server on VTO web. And you need to enable auto snapshot capturing on VTH terminal.
When you call VTH from VTO but receive no answer, you can leave a video & audio message by pressing the button in VTO. Then the guest message will be synchronized on the VTH terminal.
Figure 3. The Guest Msg in VTH