Yealink SIP-T22 - Manual (Page 103)

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