Yealink SIP-T54S Administrator's Manual page 534

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
X ranges from 1 to 2 (for SIP-T21(P) E2)
Note: It is not applicable to SIP-T19(P) E2/CP860/CP920 IP phones.
Web User Interface:
Account->Advanced->Dialog Info Call Pickup
Phone User Interface:
None
To configure dialog info call pickup via web user interface:
Click on Account->Advanced.
1.
Select the desired account from the pull-down list of Account.
2.
Select the desired value from the pull-down list of Dialog Info Call Pickup.
3.
Click Confirm to accept the change.
4.
508
Parameter Permitted Values Default