Yealink SIP-T19 - Manual (Page 93)

Basic Call Features
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2. Enter the group call pickup code in the Group Call Pickup Code field.
3. Click Confirm to accept the change.
To configure the group call pickup code on a per-line basis via web user interface:
1. Click on Account->Advanced.
2. Enter the group call pickup code in the Group Call Pickup Code field.
3. Click Confirm to accept the change.