I received a call (314) 786-3259, no message left, just a quick beep. A quick search shows they have called others. I added this number to my "call blacklist".
If you receive these annoying calls that leave no message and have a total disregard for the "No Call" lists, both Federal and State. Grab a call blocker app for your phone. I have an Android and have used the free version of Call Blacklist with excellent results Go to the Google playstore and lookup the following: com.vladlee.easyblacklist