The DNC only protects from the honest business's.  And its for telemarketers, charity's, Political and some survey's are exempt.  Most of the honest ones will remove you and put you on a internal DNC when asked. Otherwise, you need to contact the Political Parties directly and tell them DNC and they will remove you, and you can sign up for the political DNC (this works pretty well really)  http://stoppoliticalcalls.org/index.php  Then when one does call, you simply go directly to their web site (most have them) and email them a DNC letter, I included the url for the political DNC for the one I have had over the last 12 years or so and told him to use it! :)

So that only leaves the illegal Telemarketers, scammers, extortion scammers, fake Windows support scam and frauds.. and those people do not obey laws period!  Some of those are in foreign country's and thats a whole new puddle of red tape, but it does happen that they get caught.. And the scammers caught in the US get the go to jail card and heavy fines on the illegal telemarketers.

File complaints accordingly to the type of call you get:
Telemarketers
https://www.ftccomplaintassistant.gov/
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2
http://www.consumerfinance.gov/complaint/

Scammers:

Please do file reports with the FBI, your state attorney general and Department Of Justice,FTC & FCC..

http://www.ic3.gov/default.aspx
http://www.fbi.gov/
https://www.ftccomplaintassistant.gov/
https://esupport.fcc.gov/ccmsforms/form1088.action

Extortion Scams,Fake IRS, Fake DEA:

File a report with the real FBI,IRS,DEA..

FBI Extortion scam:
http://www.deadiversion.usdoj.gov/pubs/pressreleases/extortion_scam.htm
DEA Extortion scam
Report Extortion Scam: 1-877-792-2873
http://www.deadiversion.usdoj.gov/pubs/pressreleases/extortion_scam.htm
*********************
IRS: http://www.irs.gov/uac/Tax-Scams-Consumer-Alerts
      http://www.irs.gov/

http://www.forbes.com/sites/kellyphillipserb/ ... ities-to-steal/
Please do file reports with the FBI, your state attorney general and Department Of Justice,FTC & FCC..

http://www.ic3.gov/default.aspx
http://www.fbi.gov/
https://www.ftccomplaintassistant.gov/
https://esupport.fcc.gov/ccmsforms/form1088.action
*************************
https://www.donotcall.gov/
http://www.ftc.gov/opa/2008/04/dncfyi.shtm
http://business.ftc.gov/documents/bus27-complying-telemarketing-sales-rule
http://business.ftc.gov/documents/bus27-compl ... -rule#DNCrights
http://www.consumer.ftc.gov/articles/0076-telemarketing-scams

did not leave message.  Just a bunch of noise..   Fcc do your job.