More information, the CLEC that operates that prefix (itltd.net, 206-666-4991) is International Telcom Ltd (formerly Telcom Design), publishes no contact info other than their WHOIS info, and states they have trademarks for robocalling systems, Kallback, Callback, and Faxaway.
How did you get that information? They are calling me too, we need to find out how they are getting these numbers and sue the companies....there systems are being used to commit crimes and they should be held accountable.
Go to Federal Internet Crimes, Contact Us section and fill out the email contact letting them know about this... we need to fight back.