Yealink SIP-T20P - Anonymous Call Rejection

Basic Call Features
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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. Press .
2. Select Features->Anonym Call.
3. Press or to select the desired line from the Line ID field.
4. Press or to scroll to the Rejection field.
5. Press or to select Enable from the Rejection field.
6. (Optional.) Enter the anonymous call rejection on code in the Rejection On field.
7. (Optional.) Enter the anonymous call rejection off code in the Rejection Off field.
8. Press to accept the change.
You can also configure anonymous call rejection via web user interface at the path
Account->Basic>>.