Yealink SIP-T21 - Manual (Page 104)

User Guide for the SIP-T21P/SIP-T21 IP Phone
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To place an anonymous call:
1. Using the specific line on the phone to place a call to phone B.
The LCD screen of phone B prompts an incoming call from anonymity.
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 Rejection field.
4. Press or , or the Switch soft key to select Enable from the 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.