Yealink SIP-T54S Administrator's Manual page 519

Select the desired line from the pull-down list of Line.
5.
Click Confirm to accept the change.
6.
To configure the directed call pickup code on a per-line basis via web user interface:
Click on Account->Advanced.
1.
Select the desired account from the pull-down list of Account.
2.
Enter the directed call pickup code in the Directed Call Pickup Code field.
3.
Click Confirm to accept the change.
4.
To configure directed call pickup feature on a phone basis via web user interface:
Click on Features->Call Pickup.
1.
Select the desired value from the pull-down list of Directed Call Pickup.
2.
Enter the directed call pickup code in the Directed Call Pickup Code field.
3.
Configuring Basic Features
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