Yealink SIP-T2 SERIES Administrator's Manual page 350

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
server when you deactivate the anonymous call rejection feature.
If it is set to 1 (On Code), the IP phone will send anonymous rejection on code to the
server when you activate the anonymous call rejection feature.
X ranges from 1 to 16 (for SIP VP-T49G/SIP-T48G/T46G/T29G)
X ranges from 1 to 12 (for SIP-T42G)
X ranges from 1 to 6 (for SIP-T41P/T27P)
X ranges from 1 to 3 (for SIP-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860)
Web User Interface:
Account->Basic->Send Anonymous Rejection Code
Phone User Interface:
Menu->Features->Anonymous Call->Send Rejection Code
account.X.anonymous_reject_oncode
Description:
Configures the anonymous call rejection on code to activate the server-side
anonymous call rejection feature for account X.
X ranges from 1 to 16 (for SIP VP-T49G/SIP-T48G/T46G/T29G)
X ranges from 1 to 12 (for SIP-T42G)
X ranges from 1 to 6 (for SIP-T41P/T27P)
X ranges from 1 to 3 (for SIP-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860)
Example:
account.1.anonymous_reject_oncode = *74
Note: It works only if the value of the parameter
―account.X.send_anonymous_rejection_code‖ is set to 1 (On Code).
Web User Interface:
Account->Basic->Send Anonymous Rejection Code->On Code
Phone User Interface:
Menu->Features->Anonymous Call->Reject On Code
account.X.anonymous_reject_offcode
328
Parameters Permitted Values Default
String within 32
Blank
characters
String within 32
Blank
characters