Yealink SIP-T28P - Manual (Page 119)

Basic Call Features
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3. Press or to select Enable from the Send Anon field.
4. (Optional.) Press or to select the desired value from the Anon Code field.
5. (Optional.) Enter the anonymous call on code and off code respectively in the Call
On Code and Call Off Code field.
6. Press the Save soft key to accept the change or the Back soft key to cancel.
Anonymous call is configurable via web user interface at the path Account->Basic.
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 Anon Rejection field.