Yealink SIP-T28P - Manual (Page 120)

User Guide for the SIP-T28P IP Phone
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4. Press or , or the Switch soft key to select Enable from the Anon Rejection
field.
5. (Optional.) Enter the anonymous call rejection on code and off code respectively in
the Reject On Code and Reject Off Code field.
6. 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.