Denwa Communications DW-820 User Manual page 54

Click "Audio" to establish the audio call, and video is not visible; click "Video" to
establish the video call, and video is visible. Pick up the handset to answer the call as
a video call.
3) Answer a video invite
During an audio call, if a video invite is requested, it will pop up the following
window:
Click "Accept" to accept the video invite, and then the call will change to video call;
Click "Reject" to reject the video invite, audio call will retain. 10s without any
operation, the video invite will terminate.
5.1.3.2 Reject A Call
If you want to reject a call, click in calling
interface.
If you want to reject a call from a number, you can add the number to the blacklist.