Yealink VP530 - Manual (Page 87)

Basic Call Features
75
The LCD screen of phone B prompts an incoming call from anonymity.
You can use anonymous call rejection feature to reject incoming calls from anonymous
callers. Anonymous call rejection automatically rejects
incoming calls from callers who
deliberately block their identities and numbers from showing up.
To configure anonymous call rejection via phone user interface:
1. Tap ->Call Feature->Anonymous.
2. Tap the desired line.
3. Tap in the Anonymous Reject field.
4. (Optional.) Enter the anonymous call rejection on code in the On Code field.
5. (Optional.) Enter the anonymous call rejection off code in the Off Code field.
6. Press the Save soft key to accept the change or the Back soft key to cancel.
7. Tap to return to the idle screen.
You can also configure the anonymous call via web user interface at the path
Account->Basic.