i don't know what type of call blocking device you have, but mine blocks this # just fine. my phone never rings. i check my call blocker periodically to submit the numbers to the useless Do Not Call Registry and it blocked this # again today.
The DNC works just fine. It is for telemarketers only and honest business does indeed abide by it. It is the criminals (which includes illegal telemarketers), frauds and scammers that do not. However, the Fed. DNC does not cover some survey's, Political or Charities. You would need to check your states DNC laws to see if these are under your states DNC laws. The fact remains that they are not automatic call blockers though and can not protect you from the calls that are criminal, illegal or fraudulent.