Yealink VP530 - Manual (Page 71)

Basic Call Features
59
2. Tap in the Call Completion field.
3. Press the Save soft key to accept the change or the Back soft key to cancel.
4. Tap to return to the idle screen.
You can also configure call completion via web user interface at the path
Phone->Features.
To use call completion:
When the called party is busy, the following prompt will appear on the LCD screen of the
phone:
1. Tap the OK soft key, the phone returns to the idle screen and call completion is
activated.