Yealink T48S Skype For Business Edition User Manual page 191

(Optional.) Enter the string that will appear on the intercom list in the Label field.
4.
Enter the target extension number in the Value field.
5.
Tap to accept the change.
6.
Repeat steps 2 to 6, you can add more target extension numbers.
7.
To delete a target extension number via phone user interface:
Do one of the following to enter the intercom list:
1.
Tap .
-
Tap Menu->Setting->Features->Intercom List.
-
Select a desired item.
2.
Tap the Delete soft key.
3.
The touch screen prompts "Delete Selected Item?".
Tap the OK soft key to accept the change.
4.
If you want to delete all target extension numbers, you can press the Delete All soft key.
Intercom is configurable via web user interface at the path Features->Intercom.
Advanced Phone Features
189