Yealink SIP-T21 - Manual (Page 40)

User Guide for the SIP-T21P/SIP-T21 IP Phone
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3. Press the Option soft key, and then select Detail from the prompt list.
4. Press or to scroll through the group information and then edit.
5. Press the Save soft key to accept change or the Back soft key to cancel.
To delete a group from the local directory:
1. Press the Dir soft key.
The IP phone enters the local directory directly as there is only Local Directory in the
directory by default.
If Local Directory is removed from the directory , press Menu->Dir->Local Directory
to enter the local directory.
2. Select the desired group.
3. Press the Option soft key, and then select Delete from the prompt list.
The LCD screen prompts “Delete selected group?”.
4. Press the OK soft key to confirm the deletion or the Cancel soft key to cancel.
You can also delete all groups by pressing the Option soft key and then select Del All.
For more information, refer to the above steps.