Call blocking is a new feature and can be found under RESOURCES in the OnSIP Admin portal.
1.) From the Admin Portal choose RESOURCES from the menu options on the left.
2.) Click on Create New Resource
3.) Choose Call Blocking and click Create a new Call Blocking
4.) Enter the phone number to be blocked and click CONFIRM. For International numbers, select the Country from the drop-down box, enter the remaining digits in the field to the right, then CONFIRM.
if you see a pink/salmon-color error box, you've either entered too many or too few digits; not alpha characters or symbols accepted:
You will now see a new resource called Blocked Number with the blocked number listed. To edit the blocked number simply delete it and re-add.