Step 1. Log into the Admin Portal and navigate to the Corporate Administration menu.
Step 2. Select the Call Blocking (Beta) option from the Corporate Administration menu and click on the "Add" button
Step 3. Fill out the "Add Blocked Number(s) form (include the case number in the Label section) and click Save. Once saved the blocked number will be added to the Call Blocking list.
NOTE: A Full list of Country Codes can be found at https://countrycode.org/