dead air on the line.  I called the number back and it did not ring.  Scammer I am sure

Called. No message. Number now blocked.

Called Texas Landline Tue 28 Mar 2017 17:53 I answered "Who's Calling" He said "This is Ray..." I repeated "Who's Calling Who's Calling Who's Calling." He HU. Caller ID Texas Coalition. — Puhleeeese!
Cross reference: http://800notes.com/Phone.aspx/1-817-203-1144#p1172448252092038311
817 is Fort Worth which is Texas so in 2-3 minutes one can fill out online complaint forms for Telemarketer Complaint Form _ Public Utility Commission of Texas
https://www.puc.texas.gov/consumer/complaint/form/ComplaintForm.aspx?type=m
State agency is more proactive than federal. I encourage all to file on these leech numbers. Easy peasy..

Called ...didn't answer and left no voicemail. Thanks 800 notes from saving me

This is not a real human, it is a voice synth (robot) pretending. It's probably a sales call, either asking for donations, or offering credit, or to consolidate debt, or something. ANYWAY, these kinds of computerized telemarketing systems DO respond to human voice -- i.e., they not only sound good (and real), but they can also understand you (very good speech recognition) -- so, here's what you need to do: Call it back WITHOUT your number blocked (i.e., no *67) so that it can see your number on Caller ID, and then just wait for "Ray" to say (in his Southern twang) "Hello how are you today?" and then YOU just say: "Please add me to your DO NOT CALL LIST". He will say "My apologies" and then there will be a small pause for a moment, and then he will say "Adding you to the do not call list". DONE! (allegedly they will (should) add you to their own DNC list).