To deactivate a phone number, move it to your number inventory. Deactivated phone numbers stop receiving calls and are kept in the inventory for future use.
Note:
You cannot deactivate a phone number set as the primary number of a phone. To deactivate such numbers, you must remove them from the phones assigned as primary.
Procedure
From the Admin Portal homepage, navigate to Phone System > Phone Numbers > Numbers in Use.
Next to the phone number or numbers to deactivate, select the check box or boxes.
