1. Sign in to VoiceZone.
2. Select the Settings tab.
3. Select Selective Call Blocking.
5. Make sure Block calls from these numbers is selected.
6. In the Add Phone Numbers to Call Blocking List field, enter a 10-digit phone number.
7. Click the + (plus) sign to add to List.
8. Click Save.
Note: If you have more than one phone line, use the For Phone Line dropdown menu to manage individual lines.