As DPO access, you can see full list of Extension Control with all settings. This is Bizphone portal where you can not only configure and assign user, but also set the DNC Check.

After configure [Link], Please click on extension number you wish to set the DNC check:

- Then it pops up a setting window, See the instruction in Red.

  1. By pass: Check DNC but allow all calls (DNC + Non DNC numbers)
  2. Bypass Company Blacklist: Block DNC but bypass Company blacklist
  3. Check and ask to bypass: 
    If it is DNC registry, there is a announcement voice to ask you if you wish to Press key 1 to proceed the call, 
    If it is not, you can hang up call. 
  4. Check and Block: The calls will be terminated if it is DNC registry

Last step is register the extension SIP Credentials to your IP phone.