Yealink T3 Series User Manual page 80

Yealink T3 Series IP Phones User Guide
Procedure
1. Go to Menu > Features > Dsskey.
2. Select the desired line key.
3. Select Line from the Type field.
4. Select the desired line from the Account ID field.
5. (Optional.) Enter the string that will appear on the phone screen in the Label field.
6. Select Lock from the Value field.
7. Select Save.
Related Topic
Idle Screen
79