Please log in to your account online in the portal:

https://nettalkconnect.com

Click "Manage" under the picture of your DUO in the Account Manager.

Click "Call Blocking"

Go to the Block the Caller ID and then choose what is applicable:

Use this form to block a Caller ID such as UNKNOWN or ANONYMOUS.

Select a caller ID

ANONYMOUS
PRIVATE
UNAVAILABLE
UNKNOWN
OUT OF AREA
RESTRICTED

And then finally: Click the green bar saying Add to blacklist.
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