Do Not Call DNC Blocking is a unique solution for any business that maintains an in-house, do-not-contact database or who subscribes to a State or Federal DNC list. This feature requires that your DNC list database of list vendors is accessible via an API or Webhook call. This feature can be setup account-wide or on a per-extension basis and will query a list resource before each call to determine if the call should proceed or a prerecorded DNC message should be played.