Yealink SIP-T42G - Manual (Page 106)

User Guide for the SIP-T42G IP Phone
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You can use anonymous call rejection 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. Anonymous call
rejection is configurable on a per-line basis.
To configure anonymous call rejection via phone user interface:
1. Press Menu->Features->Anonymous Call.
2. Press or , or the Switch soft key to select the desired line from the Line ID
field.
3. Press or to scroll to the Anonymous Rejection field.
4. Press or , or the Switch soft key to select Enable from the Anonymous
Rejection field.
5. (Optional.) Enter the anonymous call rejection on code in the Reject On Code field.
6. (Optional.) Enter the anonymous call rejection off code in the Reject Off Code field.
7. Press the Save soft key to accept the change or the Back soft key to cancel.
Anonymous call rejection is configurable via web user interface at the path
Account->Basic.